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| 使用 Context 参数 |
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| 使用Swagger注解 |
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| 服务监听地址和发布地址 |
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| Highway |
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| 使用Service Center |
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| |
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| 定义异步处理的接口和使用异步访问 |
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| 异步逻辑执行的线程池 |
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| <article class="md-content__inner md-typeset"> |
| |
| |
| |
| |
| <h1 id="_1">异步处理</h1> |
| <p>异步处理可以更加充分的利用CPU,提升应用程序的性能。相对于同步处理,异步处理的开发过程更加复杂,出现的问题也更加难于定位。Java Chassis |
| 提供了非常灵活的异步处理机制,使得开发者能够选择性的使用同步处理和异步处理。</p> |
| <h2 id="_2">定义异步处理的接口和使用异步访问</h2> |
| <p>在Provider端,Spring MVC、JAX RS和RPC的异步接口定义类似,都使用<code>CompletableFuture</code>来声明异步接口。以透明RPC为例,定义方法如下:</p> |
| <pre><code class="language-java"> public CompletableFuture<String> sayHello(String name) { |
| CompletableFuture<String> future = new CompletableFuture<>(); |
| future.complete(name); |
| return future; |
| } |
| </code></pre> |
| <p>在Consumer端,可以使用透明RPC、InvokerUtils、AsyncRestTemplate来使用异步。以透明RPC为例,首先声明接口:</p> |
| <pre><code class="language-java">public interface Hello { |
| @ApiOperation(nickname = "sayHello", value = "") |
| CompletableFuture<String> sayHelloAsync(String name); |
| |
| String sayHello(String name); |
| } |
| </code></pre> |
| <p>上面的例子同时定义了异步访问的接口和同步访问的接口,它们可以用来访问Provider的同一个接口。 使用异步接口和使用同步接口的过程一样:</p> |
| <pre><code class="language-java"> @RpcReference(microserviceName = "name", schemaId = "Hello") |
| public Hello hello; |
| </code></pre> |
| <h2 id="_3">异步逻辑执行的线程池</h2> |
| <p>声明为异步接口,并不会改变业务逻辑入口被执行的线程。比如在Provider端,业务逻辑的入口还是在同步线程池中执行的,Edge Service在event-loop执行。 |
| 改变入口逻辑的执行线程,需要修改方法的默认线程池。异步接口执行完毕,回调逻辑在业务自定义的异步执行线程池执行。 </p> |
| <p>详细情况参考<a href="thread-pool.html">线程池</a>。 </p> |
| <p>异步逻辑在更加复杂场景下的执行过程,请参考<a href="../general-development/reactive.html">reactive</a>。</p> |
| <h2 id="event-loop">有关 event-loop 线程的特殊说明</h2> |
| <p>在Edge Service等场景,或者在Provider使用了异步线程池的场景,所有的业务逻辑都是在event-loop执行的。在event-loop执行的业务代码,不能存在 |
| 任何阻塞操作,否则会破坏event-loop的事件派发,导致死锁。 这些场景访问其他微服务,必须采用异步接口。 event-loop执行阻塞操作导致死锁的情况, |
| 或者导致性能下降的情况,需要在满足一定的并发条件才能够出现,不小心使用会给业务可靠性带来很大的风险。 Java Chassis针对常见的错误也提供了一些 |
| 检测机制,比如在event-loop执行同步Consumer调用的时候,会报告异常,让开发者及时发现问题。 </p> |
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