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d="M10 19v-5h4v5c0 .55.45 1 1 1h3c.55 0 1-.45 1-1v-7h1.7c.46 0 .68-.57.33-.87L12.67 3.6c-.38-.34-.96-.34-1.34 0l-8.36 7.53c-.34.3-.13.87.33.87H5v7c0 .55.45 1 1 1h3c.55 0 1-.45 1-1z" fill=currentColor /></svg></a><li class=breadcrumbs__item><span class=breadcrumbs__link>Guide</span><li class=breadcrumbs__item><a class=breadcrumbs__link href=/docs/guide/scala/><span>Scala</span></a><li class="breadcrumbs__item breadcrumbs__item--active"><span class=breadcrumbs__link>gRPC Support</span></ul></nav><span class="theme-doc-version-badge badge badge--secondary">Version: 1.3.0</span><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type=button class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><header><h1>gRPC Support</h1></header><p>Fory can generate Scala 3 gRPC service companions for schemas that define |
| services. The generated service code uses normal grpc-java channels, servers, |
| deadlines, status codes, interceptors, and transport security, while request |
| and response objects are serialized with Fory instead of protobuf.</p> |
| <p>Use this mode when both sides of the RPC are generated from the same Fory IDL, |
| protobuf IDL, or FlatBuffers IDL and you want gRPC transport semantics with |
| Fory payload encoding. Use standard protobuf gRPC code generation when your API |
| must be consumed by generic protobuf clients, reflection tools, or components |
| that expect protobuf message bytes.</p> |
| <h2 class="anchor anchorTargetStickyNavbar_Vzrq" id=add-dependencies>Add Dependencies<a href=#add-dependencies class=hash-link aria-label="Direct link to Add Dependencies" title="Direct link to Add Dependencies" translate=no></a></h2> |
| <p>Generated Scala service files compile against grpc-java. The <code>fory-scala</code> |
| artifact does not add gRPC as a hard dependency, so add grpc-java dependencies |
| in your application build and align the version with the rest of your service |
| stack.</p> |
| <div class="language-sbt codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-sbt codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token plain">libraryDependencies ++= Seq(</span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> "org.apache.fory" %% "fory-scala" % "<fory-version>",</span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> "io.grpc" % "grpc-api" % "<grpc-version>",</span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> "io.grpc" % "grpc-stub" % "<grpc-version>",</span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> "io.grpc" % "grpc-netty-shaded" % "<grpc-version>"</span><br/></div><div class=token-line style=color:#393A34><span class="token plain">)</span><br/></div></code></pre></div></div> |
| <p>Generated Scala models and gRPC service companions are Scala 3 source. The |
| <code>fory-scala</code> artifact remains cross-built for Scala 2.13 and Scala 3, and the |
| dependency-free <code>org.apache.fory.scala.rpc</code> handle traits are available from |
| the shared artifact.</p> |
| <h2 class="anchor anchorTargetStickyNavbar_Vzrq" id=define-a-service>Define a Service<a href=#define-a-service class=hash-link aria-label="Direct link to Define a Service" title="Direct link to Define a Service" translate=no></a></h2> |
| <p>Service definitions can come from Fory IDL, protobuf IDL, or FlatBuffers |
| <code>rpc_service</code> definitions. A Fory IDL service looks like this:</p> |
| <div class="language-protobuf codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-protobuf codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token keyword" style=color:#00009f>package</span><span class="token plain"> demo</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">greeter</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>message</span><span class="token plain"> </span><span class="token class-name">HelloRequest</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>{</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token builtin">string</span><span class="token plain"> name </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"> </span><span class="token number" style=color:#36acaa>1</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token punctuation" style=color:#393A34>}</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>message</span><span class="token plain"> </span><span class="token class-name">HelloReply</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>{</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token builtin">string</span><span class="token plain"> reply </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"> </span><span class="token number" style=color:#36acaa>1</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token punctuation" style=color:#393A34>}</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>service</span><span class="token plain"> </span><span class="token class-name">Greeter</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>{</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>rpc</span><span class="token plain"> </span><span class="token function" style=color:#d73a49>SayHello</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>(</span><span class="token class-name">HelloRequest</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>returns</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>(</span><span class="token class-name">HelloReply</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token punctuation" style=color:#393A34>}</span><br/></div></code></pre></div></div> |
| <p>Generate Scala model and gRPC companion code with <code>--grpc</code>:</p> |
| <div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-bash codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token plain">foryc service.fdl </span><span class="token parameter variable" style=color:#36acaa>--scala_out</span><span class="token operator" style=color:#393A34>=</span><span class="token plain">./generated/scala </span><span class="token parameter variable" style=color:#36acaa>--grpc</span><br/></div></code></pre></div></div> |
| <p>For this schema, the Scala generator emits:</p> |
| <table><thead><tr><th>File<th>Purpose<tbody><tr><td><code>HelloRequest.scala</code><td>Fory model type for the request<tr><td><code>HelloReply.scala</code><td>Fory model type for the response<tr><td><code>GreeterForyModule.scala</code><td>Fory registration module for generated types<tr><td><code>GreeterGrpc.scala</code><td>grpc-java service base, client, and codecs</table> |
| <h2 class="anchor anchorTargetStickyNavbar_Vzrq" id=implement-a-server>Implement a Server<a href=#implement-a-server class=hash-link aria-label="Direct link to Implement a Server" title="Direct link to Implement a Server" translate=no></a></h2> |
| <p>Extend the generated <code>GreeterGrpc.GreeterImplBase</code> class and register it with a |
| standard grpc-java <code>Server</code>. Unary RPCs can be implemented with a direct |
| request-to-response method:</p> |
| <div class="language-scala codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-scala codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token keyword" style=color:#00009f>package</span><span class="token plain"> </span><span class="token namespace" style=opacity:0.7>demo</span><span class="token namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token namespace" style=opacity:0.7>greeter</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>import</span><span class="token plain"> </span><span class="token namespace" style=opacity:0.7>io</span><span class="token namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token namespace" style=opacity:0.7>grpc</span><span class="token namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token plain">ServerBuilder</span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>final</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>class</span><span class="token plain"> GreeterService </span><span class="token keyword" style=color:#00009f>extends</span><span class="token plain"> GreeterGrpc</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">GreeterImplBase </span><span class="token punctuation" style=color:#393A34>{</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>override</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>def</span><span class="token plain"> sayHello</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">request</span><span class="token operator" style=color:#393A34>:</span><span class="token plain"> HelloRequest</span><span class="token punctuation" style=color:#393A34>)</span><span class="token operator" style=color:#393A34>:</span><span class="token plain"> HelloReply </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> HelloReply</span><span class="token punctuation" style=color:#393A34>(</span><span class="token string-interpolation id function" style=color:#d73a49>s</span><span class="token string-interpolation string" style=color:#e3116c>"Hello, </span><span class="token string-interpolation interpolation punctuation" style=color:#393A34>${</span><span class="token string-interpolation interpolation expression">request</span><span class="token string-interpolation interpolation expression punctuation" style=color:#393A34>.</span><span class="token string-interpolation interpolation expression">name</span><span class="token string-interpolation interpolation punctuation" style=color:#393A34>}</span><span class="token string-interpolation string" style=color:#e3116c>"</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token punctuation" style=color:#393A34>}</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token annotation punctuation" style=color:#393A34>@main</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>def</span><span class="token plain"> runServer</span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>)</span><span class="token operator" style=color:#393A34>:</span><span class="token plain"> </span><span class="token builtin">Unit</span><span class="token plain"> </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>{</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>val</span><span class="token plain"> server </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"> ServerBuilder</span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">forPort</span><span class="token punctuation" style=color:#393A34>(</span><span class="token number" style=color:#36acaa>50051</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">addService</span><span class="token punctuation" style=color:#393A34>(</span><span class="token keyword" style=color:#00009f>new</span><span class="token plain"> GreeterService</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">build</span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">start</span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> server</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">awaitTermination</span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token punctuation" style=color:#393A34>}</span><br/></div></code></pre></div></div> |
| <p>Generated request and response types are registered by the generated code, so |
| service implementations do not perform manual serializer registration.</p> |
| <h2 class="anchor anchorTargetStickyNavbar_Vzrq" id=create-a-client>Create a Client<a href=#create-a-client class=hash-link aria-label="Direct link to Create a Client" title="Direct link to Create a Client" translate=no></a></h2> |
| <p>Use the generated client with an ordinary grpc-java channel:</p> |
| <div class="language-scala codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-scala codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token keyword" style=color:#00009f>package</span><span class="token plain"> </span><span class="token namespace" style=opacity:0.7>demo</span><span class="token namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token namespace" style=opacity:0.7>greeter</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>import</span><span class="token plain"> </span><span class="token namespace" style=opacity:0.7>io</span><span class="token namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token namespace" style=opacity:0.7>grpc</span><span class="token namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token plain">ManagedChannelBuilder</span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>import</span><span class="token plain"> </span><span class="token namespace" style=opacity:0.7>scala</span><span class="token namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token namespace" style=opacity:0.7>concurrent</span><span class="token namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token plain">Await</span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>import</span><span class="token plain"> </span><span class="token namespace" style=opacity:0.7>scala</span><span class="token namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token namespace" style=opacity:0.7>concurrent</span><span class="token namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token namespace" style=opacity:0.7>duration</span><span class="token namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token plain">DurationInt</span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token annotation punctuation" style=color:#393A34>@main</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>def</span><span class="token plain"> runClient</span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>)</span><span class="token operator" style=color:#393A34>:</span><span class="token plain"> </span><span class="token builtin">Unit</span><span class="token plain"> </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>{</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>val</span><span class="token plain"> channel </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"> ManagedChannelBuilder</span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">forAddress</span><span class="token punctuation" style=color:#393A34>(</span><span class="token string" style=color:#e3116c>"localhost"</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"> </span><span class="token number" style=color:#36acaa>50051</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">usePlaintext</span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">build</span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>try</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>{</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>val</span><span class="token plain"> client </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"> GreeterGrpc</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">newClient</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">channel</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>val</span><span class="token plain"> call </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"> client</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">sayHello</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">HelloRequest</span><span class="token punctuation" style=color:#393A34>(</span><span class="token string" style=color:#e3116c>"Fory"</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>val</span><span class="token plain"> reply </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"> Await</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">result</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">call</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">asFuture</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"> </span><span class="token number" style=color:#36acaa>30.</span><span class="token plain">seconds</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> println</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">reply</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">reply</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>}</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>finally</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>{</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> channel</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">shutdownNow</span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>}</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token punctuation" style=color:#393A34>}</span><br/></div></code></pre></div></div> |
| <p>Unary Scala-friendly methods return <code>RpcFuture[A]</code>. Use <code>asFuture</code> for Scala |
| composition, and call <code>cancel()</code> when the RPC should be cancelled before it |
| completes. The same generated client also exposes grpc-java-style per-method |
| variants such as observer-based async calls, blocking calls, and |
| <code>ListenableFuture</code> unary calls.</p> |
| <h2 class="anchor anchorTargetStickyNavbar_Vzrq" id=streaming-rpcs>Streaming RPCs<a href=#streaming-rpcs class=hash-link aria-label="Direct link to Streaming RPCs" title="Direct link to Streaming RPCs" translate=no></a></h2> |
| <p>Fory service definitions can use the same gRPC streaming shapes as grpc-java:</p> |
| <div class="language-protobuf codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-protobuf codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token keyword" style=color:#00009f>service</span><span class="token plain"> </span><span class="token class-name">Greeter</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>{</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>rpc</span><span class="token plain"> </span><span class="token function" style=color:#d73a49>SayHello</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>(</span><span class="token class-name">HelloRequest</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>returns</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>(</span><span class="token class-name">HelloReply</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>rpc</span><span class="token plain"> </span><span class="token function" style=color:#d73a49>LotsOfReplies</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>(</span><span class="token class-name">HelloRequest</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>returns</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>(</span><span class="token keyword" style=color:#00009f>stream</span><span class="token plain"> </span><span class="token class-name">HelloReply</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>rpc</span><span class="token plain"> </span><span class="token function" style=color:#d73a49>LotsOfGreetings</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>(</span><span class="token keyword" style=color:#00009f>stream</span><span class="token plain"> </span><span class="token class-name">HelloRequest</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>returns</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>(</span><span class="token class-name">HelloReply</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>rpc</span><span class="token plain"> </span><span class="token function" style=color:#d73a49>Chat</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>(</span><span class="token keyword" style=color:#00009f>stream</span><span class="token plain"> </span><span class="token class-name">HelloRequest</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>returns</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>(</span><span class="token keyword" style=color:#00009f>stream</span><span class="token plain"> </span><span class="token class-name">HelloReply</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>;</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token punctuation" style=color:#393A34>}</span><br/></div></code></pre></div></div> |
| <p>Generated Scala methods use these shapes:</p> |
| <table><thead><tr><th>IDL shape<th>Scala client convenience<th>grpc-java-style methods<tbody><tr><td>Unary<td><code>RpcFuture[Resp]</code><td>Async observer, blocking, and <code>ListenableFuture</code><tr><td>Server streaming<td><code>RpcIterator[Resp]</code><td>Async observer and blocking iterator<tr><td>Client streaming<td>None<td><code>StreamObserver</code> request stream<tr><td>Bidirectional streaming<td>None<td><code>StreamObserver</code> request and response streams</table> |
| <p>The Scala-friendly convenience layer covers the cases where a direct Scala |
| handle can keep the important lifecycle controls. Unary calls use |
| <code>RpcFuture[A]</code> so callers can compose with Scala <code>Future</code> without losing |
| cancellation. Server-streaming calls use <code>RpcIterator[A]</code> so callers can consume |
| responses with the normal Scala <code>Iterator</code> contract while still being able to |
| close the underlying RPC. Client-streaming and bidirectional streaming stay on |
| grpc-java <code>StreamObserver</code> APIs because the request stream lifecycle, |
| completion, cancellation, and flow-control rules are the grpc-java rules.</p> |
| <h3 class="anchor anchorTargetStickyNavbar_Vzrq" id=server-streaming-clients>Server-Streaming Clients<a href=#server-streaming-clients class=hash-link aria-label="Direct link to Server-Streaming Clients" title="Direct link to Server-Streaming Clients" translate=no></a></h3> |
| <p>Use the Scala-friendly method when the client wants pull-style consumption:</p> |
| <div class="language-scala codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-scala codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token keyword" style=color:#00009f>val</span><span class="token plain"> stream </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"> client</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">lotsOfReplies</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">HelloRequest</span><span class="token punctuation" style=color:#393A34>(</span><span class="token string" style=color:#e3116c>"Fory"</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>try</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>{</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>while</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">stream</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">hasNext</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>{</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>val</span><span class="token plain"> reply </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"> stream</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">next</span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> println</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">reply</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">reply</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>}</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token punctuation" style=color:#393A34>}</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>finally</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>{</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> stream</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">close</span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token punctuation" style=color:#393A34>}</span><br/></div></code></pre></div></div> |
| <p><code>RpcIterator[A]</code> extends Scala <code>Iterator[A]</code> and <code>AutoCloseable</code>. A fully |
| consumed stream closes when the server completes it. If the caller stops early, |
| call <code>close()</code> or <code>cancel()</code> to release the gRPC call and notify the server that |
| the response stream is no longer needed.</p> |
| <p>Use the observer overload when the client wants grpc-java async callbacks:</p> |
| <div class="language-scala codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-scala codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token keyword" style=color:#00009f>import</span><span class="token plain"> </span><span class="token namespace" style=opacity:0.7>io</span><span class="token namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token namespace" style=opacity:0.7>grpc</span><span class="token namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token namespace" style=opacity:0.7>stub</span><span class="token namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token plain">StreamObserver</span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain">client</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">lotsOfReplies</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> HelloRequest</span><span class="token punctuation" style=color:#393A34>(</span><span class="token string" style=color:#e3116c>"Fory"</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>new</span><span class="token plain"> StreamObserver</span><span class="token punctuation" style=color:#393A34>[</span><span class="token plain">HelloReply</span><span class="token punctuation" style=color:#393A34>]</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>{</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>override</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>def</span><span class="token plain"> onNext</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">value</span><span class="token operator" style=color:#393A34>:</span><span class="token plain"> HelloReply</span><span class="token punctuation" style=color:#393A34>)</span><span class="token operator" style=color:#393A34>:</span><span class="token plain"> </span><span class="token builtin">Unit</span><span class="token plain"> </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> println</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">value</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">reply</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>override</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>def</span><span class="token plain"> onError</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">t</span><span class="token operator" style=color:#393A34>:</span><span class="token plain"> Throwable</span><span class="token punctuation" style=color:#393A34>)</span><span class="token operator" style=color:#393A34>:</span><span class="token plain"> </span><span class="token builtin">Unit</span><span class="token plain"> </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> t</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">printStackTrace</span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>override</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>def</span><span class="token plain"> onCompleted</span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>)</span><span class="token operator" style=color:#393A34>:</span><span class="token plain"> </span><span class="token builtin">Unit</span><span class="token plain"> </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> println</span><span class="token punctuation" style=color:#393A34>(</span><span class="token string" style=color:#e3116c>"done"</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>}</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token punctuation" style=color:#393A34>)</span><br/></div></code></pre></div></div> |
| <p>The generated client also exposes a blocking grpc-java-style iterator through |
| <code>lotsOfRepliesBlocking(request)</code>. Prefer the Scala-friendly <code>RpcIterator</code> when |
| you need early cancellation; use the blocking iterator only when matching an |
| existing grpc-java workflow.</p> |
| <h3 class="anchor anchorTargetStickyNavbar_Vzrq" id=client-streaming-clients>Client-Streaming Clients<a href=#client-streaming-clients class=hash-link aria-label="Direct link to Client-Streaming Clients" title="Direct link to Client-Streaming Clients" translate=no></a></h3> |
| <p>For client-streaming RPCs, the generated method accepts a response observer and |
| returns the request observer. Send every request with <code>onNext</code>, then call |
| <code>onCompleted</code> exactly once when the client has finished sending:</p> |
| <div class="language-scala codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-scala codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token keyword" style=color:#00009f>import</span><span class="token plain"> </span><span class="token namespace" style=opacity:0.7>io</span><span class="token namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token namespace" style=opacity:0.7>grpc</span><span class="token namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token namespace" style=opacity:0.7>stub</span><span class="token namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token plain">StreamObserver</span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>val</span><span class="token plain"> requests </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"> client</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">lotsOfGreetings</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>new</span><span class="token plain"> StreamObserver</span><span class="token punctuation" style=color:#393A34>[</span><span class="token plain">HelloReply</span><span class="token punctuation" style=color:#393A34>]</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>{</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>override</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>def</span><span class="token plain"> onNext</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">value</span><span class="token operator" style=color:#393A34>:</span><span class="token plain"> HelloReply</span><span class="token punctuation" style=color:#393A34>)</span><span class="token operator" style=color:#393A34>:</span><span class="token plain"> </span><span class="token builtin">Unit</span><span class="token plain"> </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> println</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">value</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">reply</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>override</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>def</span><span class="token plain"> onError</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">t</span><span class="token operator" style=color:#393A34>:</span><span class="token plain"> Throwable</span><span class="token punctuation" style=color:#393A34>)</span><span class="token operator" style=color:#393A34>:</span><span class="token plain"> </span><span class="token builtin">Unit</span><span class="token plain"> </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> t</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">printStackTrace</span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>override</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>def</span><span class="token plain"> onCompleted</span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>)</span><span class="token operator" style=color:#393A34>:</span><span class="token plain"> </span><span class="token builtin">Unit</span><span class="token plain"> </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> println</span><span class="token punctuation" style=color:#393A34>(</span><span class="token string" style=color:#e3116c>"server completed"</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>}</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain">requests</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">onNext</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">HelloRequest</span><span class="token punctuation" style=color:#393A34>(</span><span class="token string" style=color:#e3116c>"Ada"</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain">requests</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">onNext</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">HelloRequest</span><span class="token punctuation" style=color:#393A34>(</span><span class="token string" style=color:#e3116c>"Grace"</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain">requests</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">onCompleted</span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>)</span><br/></div></code></pre></div></div> |
| <p>If the client cannot finish sending requests, signal the failure with |
| <code>requests.onError(error)</code>. Deadlines, cancellation, and call options are the |
| standard grpc-java stub features, so they are configured on the generated client |
| stub before starting the call.</p> |
| <h3 class="anchor anchorTargetStickyNavbar_Vzrq" id=bidirectional-clients>Bidirectional Clients<a href=#bidirectional-clients class=hash-link aria-label="Direct link to Bidirectional Clients" title="Direct link to Bidirectional Clients" translate=no></a></h3> |
| <p>Bidirectional streaming uses the same grpc-java request observer pattern, but |
| responses can arrive while the client is still sending requests:</p> |
| <div class="language-scala codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-scala codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token keyword" style=color:#00009f>import</span><span class="token plain"> </span><span class="token namespace" style=opacity:0.7>io</span><span class="token namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token namespace" style=opacity:0.7>grpc</span><span class="token namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token namespace" style=opacity:0.7>stub</span><span class="token namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token plain">StreamObserver</span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>val</span><span class="token plain"> requests </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"> client</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">chat</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>new</span><span class="token plain"> StreamObserver</span><span class="token punctuation" style=color:#393A34>[</span><span class="token plain">HelloReply</span><span class="token punctuation" style=color:#393A34>]</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>{</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>override</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>def</span><span class="token plain"> onNext</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">value</span><span class="token operator" style=color:#393A34>:</span><span class="token plain"> HelloReply</span><span class="token punctuation" style=color:#393A34>)</span><span class="token operator" style=color:#393A34>:</span><span class="token plain"> </span><span class="token builtin">Unit</span><span class="token plain"> </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> println</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">value</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">reply</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>override</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>def</span><span class="token plain"> onError</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">t</span><span class="token operator" style=color:#393A34>:</span><span class="token plain"> Throwable</span><span class="token punctuation" style=color:#393A34>)</span><span class="token operator" style=color:#393A34>:</span><span class="token plain"> </span><span class="token builtin">Unit</span><span class="token plain"> </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> t</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">printStackTrace</span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>override</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>def</span><span class="token plain"> onCompleted</span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>)</span><span class="token operator" style=color:#393A34>:</span><span class="token plain"> </span><span class="token builtin">Unit</span><span class="token plain"> </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> println</span><span class="token punctuation" style=color:#393A34>(</span><span class="token string" style=color:#e3116c>"chat closed"</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>}</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain">requests</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">onNext</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">HelloRequest</span><span class="token punctuation" style=color:#393A34>(</span><span class="token string" style=color:#e3116c>"first"</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain">requests</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">onNext</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">HelloRequest</span><span class="token punctuation" style=color:#393A34>(</span><span class="token string" style=color:#e3116c>"second"</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain">requests</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">onCompleted</span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>)</span><br/></div></code></pre></div></div> |
| <p>Use grpc-java observer subtypes such as <code>ClientResponseObserver</code>, |
| <code>ClientCallStreamObserver</code>, or <code>ServerCallStreamObserver</code> when an application |
| needs manual inbound flow control, readiness callbacks, cancellation handlers, |
| or direct transport-level cancellation. The generated Scala methods accept the |
| standard grpc-java observer types, so those advanced grpc-java patterns remain |
| available without a separate Fory API.</p> |
| <h3 class="anchor anchorTargetStickyNavbar_Vzrq" id=streaming-servers>Streaming Servers<a href=#streaming-servers class=hash-link aria-label="Direct link to Streaming Servers" title="Direct link to Streaming Servers" translate=no></a></h3> |
| <p>Unary server methods can use the direct Scala-friendly override shown earlier. |
| Streaming server methods use grpc-java observers. A server-streaming |
| implementation receives one request and writes zero or more responses:</p> |
| <div class="language-scala codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-scala codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token keyword" style=color:#00009f>import</span><span class="token plain"> </span><span class="token namespace" style=opacity:0.7>io</span><span class="token namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token namespace" style=opacity:0.7>grpc</span><span class="token namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token namespace" style=opacity:0.7>stub</span><span class="token namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token plain">StreamObserver</span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>import</span><span class="token plain"> </span><span class="token namespace" style=opacity:0.7>scala</span><span class="token namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token namespace" style=opacity:0.7>util</span><span class="token namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token namespace" style=opacity:0.7>control</span><span class="token namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token plain">NonFatal</span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>final</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>class</span><span class="token plain"> GreeterService </span><span class="token keyword" style=color:#00009f>extends</span><span class="token plain"> GreeterGrpc</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">GreeterImplBase </span><span class="token punctuation" style=color:#393A34>{</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>override</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>def</span><span class="token plain"> lotsOfReplies</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> request</span><span class="token operator" style=color:#393A34>:</span><span class="token plain"> HelloRequest</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> responseObserver</span><span class="token operator" style=color:#393A34>:</span><span class="token plain"> StreamObserver</span><span class="token punctuation" style=color:#393A34>[</span><span class="token plain">HelloReply</span><span class="token punctuation" style=color:#393A34>]</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>)</span><span class="token operator" style=color:#393A34>:</span><span class="token plain"> </span><span class="token builtin">Unit</span><span class="token plain"> </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>try</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>{</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> responseObserver</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">onNext</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">HelloReply</span><span class="token punctuation" style=color:#393A34>(</span><span class="token string-interpolation id function" style=color:#d73a49>s</span><span class="token string-interpolation string" style=color:#e3116c>"Hello, </span><span class="token string-interpolation interpolation punctuation" style=color:#393A34>${</span><span class="token string-interpolation interpolation expression">request</span><span class="token string-interpolation interpolation expression punctuation" style=color:#393A34>.</span><span class="token string-interpolation interpolation expression">name</span><span class="token string-interpolation interpolation punctuation" style=color:#393A34>}</span><span class="token string-interpolation string" style=color:#e3116c>"</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> responseObserver</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">onNext</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">HelloReply</span><span class="token punctuation" style=color:#393A34>(</span><span class="token string-interpolation id function" style=color:#d73a49>s</span><span class="token string-interpolation string" style=color:#e3116c>"Welcome, </span><span class="token string-interpolation interpolation punctuation" style=color:#393A34>${</span><span class="token string-interpolation interpolation expression">request</span><span class="token string-interpolation interpolation expression punctuation" style=color:#393A34>.</span><span class="token string-interpolation interpolation expression">name</span><span class="token string-interpolation interpolation punctuation" style=color:#393A34>}</span><span class="token string-interpolation string" style=color:#e3116c>"</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> responseObserver</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">onCompleted</span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>}</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>catch</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>{</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>case</span><span class="token plain"> NonFatal</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">e</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>=></span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> responseObserver</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">onError</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">e</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>}</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token punctuation" style=color:#393A34>}</span><br/></div></code></pre></div></div> |
| <p>Client-streaming servers return an observer for incoming requests and write the |
| single response when the request stream completes:</p> |
| <div class="language-scala codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-scala codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token keyword" style=color:#00009f>import</span><span class="token plain"> </span><span class="token namespace" style=opacity:0.7>io</span><span class="token namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token namespace" style=opacity:0.7>grpc</span><span class="token namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token namespace" style=opacity:0.7>stub</span><span class="token namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token plain">StreamObserver</span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>import</span><span class="token plain"> </span><span class="token namespace" style=opacity:0.7>scala</span><span class="token namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token namespace" style=opacity:0.7>collection</span><span class="token namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token namespace" style=opacity:0.7>mutable</span><span class="token namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token plain">ArrayBuffer</span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>final</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>class</span><span class="token plain"> GreeterService </span><span class="token keyword" style=color:#00009f>extends</span><span class="token plain"> GreeterGrpc</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">GreeterImplBase </span><span class="token punctuation" style=color:#393A34>{</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>override</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>def</span><span class="token plain"> lotsOfGreetings</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> responseObserver</span><span class="token operator" style=color:#393A34>:</span><span class="token plain"> StreamObserver</span><span class="token punctuation" style=color:#393A34>[</span><span class="token plain">HelloReply</span><span class="token punctuation" style=color:#393A34>]</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>)</span><span class="token operator" style=color:#393A34>:</span><span class="token plain"> StreamObserver</span><span class="token punctuation" style=color:#393A34>[</span><span class="token plain">HelloRequest</span><span class="token punctuation" style=color:#393A34>]</span><span class="token plain"> </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>new</span><span class="token plain"> StreamObserver</span><span class="token punctuation" style=color:#393A34>[</span><span class="token plain">HelloRequest</span><span class="token punctuation" style=color:#393A34>]</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>{</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>private</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>val</span><span class="token plain"> names </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"> ArrayBuffer</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">empty</span><span class="token punctuation" style=color:#393A34>[</span><span class="token builtin">String</span><span class="token punctuation" style=color:#393A34>]</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>override</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>def</span><span class="token plain"> onNext</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">value</span><span class="token operator" style=color:#393A34>:</span><span class="token plain"> HelloRequest</span><span class="token punctuation" style=color:#393A34>)</span><span class="token operator" style=color:#393A34>:</span><span class="token plain"> </span><span class="token builtin">Unit</span><span class="token plain"> </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> names </span><span class="token operator" style=color:#393A34>+=</span><span class="token plain"> value</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">name</span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>override</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>def</span><span class="token plain"> onError</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">t</span><span class="token operator" style=color:#393A34>:</span><span class="token plain"> Throwable</span><span class="token punctuation" style=color:#393A34>)</span><span class="token operator" style=color:#393A34>:</span><span class="token plain"> </span><span class="token builtin">Unit</span><span class="token plain"> </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> names</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">clear</span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>override</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>def</span><span class="token plain"> onCompleted</span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>)</span><span class="token operator" style=color:#393A34>:</span><span class="token plain"> </span><span class="token builtin">Unit</span><span class="token plain"> </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>{</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> responseObserver</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">onNext</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">HelloReply</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">names</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">mkString</span><span class="token punctuation" style=color:#393A34>(</span><span class="token string" style=color:#e3116c>"Hello "</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"> </span><span class="token string" style=color:#e3116c>", "</span><span class="token punctuation" style=color:#393A34>,</span><span class="token plain"> </span><span class="token string" style=color:#e3116c>""</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> responseObserver</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">onCompleted</span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>}</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>}</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token punctuation" style=color:#393A34>}</span><br/></div></code></pre></div></div> |
| <p>Bidirectional servers also return an observer for incoming requests, but may |
| emit responses from each <code>onNext</code> call:</p> |
| <div class="language-scala codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-scala codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token keyword" style=color:#00009f>import</span><span class="token plain"> </span><span class="token namespace" style=opacity:0.7>io</span><span class="token namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token namespace" style=opacity:0.7>grpc</span><span class="token namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token namespace" style=opacity:0.7>stub</span><span class="token namespace punctuation" style=opacity:0.7;color:#393A34>.</span><span class="token plain">StreamObserver</span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token keyword" style=color:#00009f>final</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>class</span><span class="token plain"> GreeterService </span><span class="token keyword" style=color:#00009f>extends</span><span class="token plain"> GreeterGrpc</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">GreeterImplBase </span><span class="token punctuation" style=color:#393A34>{</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>override</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>def</span><span class="token plain"> chat</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> responseObserver</span><span class="token operator" style=color:#393A34>:</span><span class="token plain"> StreamObserver</span><span class="token punctuation" style=color:#393A34>[</span><span class="token plain">HelloReply</span><span class="token punctuation" style=color:#393A34>]</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>)</span><span class="token operator" style=color:#393A34>:</span><span class="token plain"> StreamObserver</span><span class="token punctuation" style=color:#393A34>[</span><span class="token plain">HelloRequest</span><span class="token punctuation" style=color:#393A34>]</span><span class="token plain"> </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>new</span><span class="token plain"> StreamObserver</span><span class="token punctuation" style=color:#393A34>[</span><span class="token plain">HelloRequest</span><span class="token punctuation" style=color:#393A34>]</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>{</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>override</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>def</span><span class="token plain"> onNext</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">value</span><span class="token operator" style=color:#393A34>:</span><span class="token plain"> HelloRequest</span><span class="token punctuation" style=color:#393A34>)</span><span class="token operator" style=color:#393A34>:</span><span class="token plain"> </span><span class="token builtin">Unit</span><span class="token plain"> </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> responseObserver</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">onNext</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">HelloReply</span><span class="token punctuation" style=color:#393A34>(</span><span class="token string-interpolation id function" style=color:#d73a49>s</span><span class="token string-interpolation string" style=color:#e3116c>"Echo: </span><span class="token string-interpolation interpolation punctuation" style=color:#393A34>${</span><span class="token string-interpolation interpolation expression">value</span><span class="token string-interpolation interpolation expression punctuation" style=color:#393A34>.</span><span class="token string-interpolation interpolation expression">name</span><span class="token string-interpolation interpolation punctuation" style=color:#393A34>}</span><span class="token string-interpolation string" style=color:#e3116c>"</span><span class="token punctuation" style=color:#393A34>)</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>override</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>def</span><span class="token plain"> onError</span><span class="token punctuation" style=color:#393A34>(</span><span class="token plain">t</span><span class="token operator" style=color:#393A34>:</span><span class="token plain"> Throwable</span><span class="token punctuation" style=color:#393A34>)</span><span class="token operator" style=color:#393A34>:</span><span class="token plain"> </span><span class="token builtin">Unit</span><span class="token plain"> </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token keyword" style=color:#00009f>override</span><span class="token plain"> </span><span class="token keyword" style=color:#00009f>def</span><span class="token plain"> onCompleted</span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>)</span><span class="token operator" style=color:#393A34>:</span><span class="token plain"> </span><span class="token builtin">Unit</span><span class="token plain"> </span><span class="token operator" style=color:#393A34>=</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> responseObserver</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">onCompleted</span><span class="token punctuation" style=color:#393A34>(</span><span class="token punctuation" style=color:#393A34>)</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>}</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token punctuation" style=color:#393A34>}</span><br/></div></code></pre></div></div> |
| <p>Server-streaming, client-streaming, and bidirectional server methods use |
| grpc-java <code>StreamObserver</code> APIs because streaming completion, request flow |
| control, cancellation, and backpressure follow grpc-java behavior.</p> |
| <h2 class="anchor anchorTargetStickyNavbar_Vzrq" id=grpc-runtime-behavior>gRPC Runtime Behavior<a href=#grpc-runtime-behavior class=hash-link aria-label="Direct link to gRPC Runtime Behavior" title="Direct link to gRPC Runtime Behavior" translate=no></a></h2> |
| <p>The generated service code only replaces request and response serialization. |
| All normal gRPC operational features still belong to grpc-java:</p> |
| <ul> |
| <li class="">Deadlines and cancellations</li> |
| <li class="">TLS and authentication</li> |
| <li class="">Name resolution and load balancing</li> |
| <li class="">Client and server interceptors</li> |
| <li class="">Status codes and metadata</li> |
| <li class="">Channel pooling and lifecycle management</li> |
| </ul> |
| <h2 class="anchor anchorTargetStickyNavbar_Vzrq" id=troubleshooting>Troubleshooting<a href=#troubleshooting class=hash-link aria-label="Direct link to Troubleshooting" title="Direct link to Troubleshooting" translate=no></a></h2> |
| <h3 class="anchor anchorTargetStickyNavbar_Vzrq" id=missing-iogrpc-or-guava-classes>Missing <code>io.grpc</code> or Guava Classes<a href=#missing-iogrpc-or-guava-classes class=hash-link aria-label="Direct link to missing-iogrpc-or-guava-classes" title="Direct link to missing-iogrpc-or-guava-classes" translate=no></a></h3> |
| <p>Add the grpc-java dependencies shown above. Generated Fory service files import |
| grpc-java APIs, but <code>fory-scala</code> intentionally does not depend on gRPC.</p> |
| <h3 class="anchor anchorTargetStickyNavbar_Vzrq" id=generic-protobuf-clients-cannot-read-payloads>Generic Protobuf Clients Cannot Read Payloads<a href=#generic-protobuf-clients-cannot-read-payloads class=hash-link aria-label="Direct link to Generic Protobuf Clients Cannot Read Payloads" title="Direct link to Generic Protobuf Clients Cannot Read Payloads" translate=no></a></h3> |
| <p>Fory-generated gRPC services use Fory bytes inside gRPC message frames, not |
| protobuf message bytes. Use a Fory-generated client for Fory-generated services, |
| or provide a separate protobuf service endpoint for generic protobuf clients.</div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="row margin-top--sm theme-doc-footer-edit-meta-row"><div class="col noPrint_WFHX"><a href=https://github.com/apache/fory-site/tree/main/docs/guide/scala/grpc-support.md target=_blank rel="noopener noreferrer" class=theme-edit-this-page><svg fill=currentColor height=20 width=20 viewBox="0 0 40 40" class=iconEdit_Z9Sw aria-hidden=true><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 3.1-3q0.5-0.5 1.2-0.5t1.1 0.5l3.9 3.9q0.5 0.4 0.5 1.1t-0.5 1.2z m-29.5 17.1l18.4-18.5 6.3 6.3-18.4 18.4h-6.3v-6.2z"/></g></svg>Edit this page</a></div><div class="col lastUpdated_JAkA"></div></div></footer></article><nav class="docusaurus-mt-lg pagination-nav" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" href=/docs/guide/scala/schema_idl><div class=pagination-nav__sublabel>Previous</div><div class=pagination-nav__label>Schema IDL And 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