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<h1 id="201">2.0.1 新特性介绍： 泛化调用</h1>
<p>泛化调用指在不知道 Provider 接口定义信息的情况下，访问 Provider 提供的服务。 与泛化调用对应的方式包括透明 RPC（POJO）和
RestTemplate。 透明 RPC 需要提供 Provider 对应的接口， RestTemplate 需要提供 Provider 对应的 URL 和 数据 Model 。 泛化
调用需要提供 Provider 的服务元数据： 微服务名称， 版本， Schema ID， Operation ID, 契约参数等信息。 </p>
<p>java-chassis 很早就提供了泛化调用， 本文重点介绍 2.0.1 的功能。 2.0.1 对于泛化调用的接口进行了优化， 支持指定响应类型，
早期的版本的响应类型取决于运行上下文， 是不确定的。 </p>
<h2 id="_1">使用泛化调用</h2>
<p>假设 Provider 采用透明 RPC 的方式提供了如下服务：</p>
<pre><code class="language-java">@RpcSchema(schemaId = &quot;InvokerEndpoint&quot;)
public class InvokerEndpoint {
public ServerModel model(ServerModel request) {
return request;
}
}
public class ServerModel {
private String name;
private int code;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getCode() {
return code;
}
public void setCode(int code) {
this.code = code;
}
}
</code></pre>
<p>可以采用 InvokerUtils 访问这个服务：</p>
<pre><code class="language-java">Map&lt;String, Object&gt; args = new HashMap&lt;&gt;();
ClientModel model = new ClientModel();
model.setCode(200);
model.setName(&quot;hello&quot;);
args.put(&quot;request&quot;, model);
ClientModel modelResult = InvokerUtils.syncInvoke(&quot;pojo&quot;, &quot;InvokerEndpoint&quot;, &quot;model&quot;, args, ClientModel.class);
TestMgr.check(model.getCode(), modelResult.getCode());
TestMgr.check(model.getName(), modelResult.getName());
public class ClientModel {
private String name;
private int code;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getCode() {
return code;
}
public void setCode(int code) {
this.code = code;
}
}
</code></pre>
<p>可以看出，在泛化调用的情况下， Provider 和 Consumer 可以使用不一样 package 的 Model。 Consumer 还可以不使用任何 Model, 而采用
Map 的方式访问：</p>
<pre><code class="language-java">Map&lt;String, Object&gt; args = new HashMap&lt;&gt;();
Map model = new HashMap();
model.put(&quot;code&quot;, 20);
model.put(&quot;name&quot;, &quot;hello&quot;);
args.put(&quot;request&quot;, model);
ClientModel modelResult = InvokerUtils.syncInvoke(&quot;pojo&quot;, &quot;InvokerEndpoint&quot;, &quot;model&quot;, args, ClientModel.class);
TestMgr.check(model.get(&quot;code&quot;), modelResult.getCode());
TestMgr.check(model.get(&quot;name&quot;), modelResult.getName());
</code></pre>
<p>需要特别说明的是参数 <code>swaggerArguments</code> ， 这个参数是和 Provider 接口生成的契约对应的， 不关注 Provider 是采用透明 RPC， 还是
采用 Spring MVC ， 或者 JAX RS 开发的服务。 需要注意 <code>swaggerArguments</code> 可能和 Provider 的接口定义的参数列表不一样，比如透明
RPC 开发模式下多个参数的场景， Spring MVC 的 Bean Param 的场景等等。 </p>
<h2 id="reactive-api">采用 reactive API</h2>
<p>2.0.1 泛化调用还增加了对应的 reactive API， 这样更加方便采用 reactive 方式调用 Provider 的服务。 </p>
<pre><code class="language-java">CountDownLatch countDownLatch = new CountDownLatch(1);
InvokerUtils.reactiveInvoke(&quot;pojo&quot;, &quot;InvokerEndpoint&quot;, &quot;model&quot;, args, ClientModel.class, response -&gt; {
ClientModel reactiveResult = response.getResult();
TestMgr.check(model.getCode(), reactiveResult.getCode());
TestMgr.check(model.getName(), reactiveResult.getName());
countDownLatch.countDown();
});
countDownLatch.await();
</code></pre>
<h2 id="201-api">2.0.1 版本之前的 API</h2>
<p>2.0.1 版本之前的 API 不能够指定 <code>responseType</code> ， 因此返回值类型是不确定的， 这个取决于运行的上下文。 如果 Consumer 没有加载
任何 <code>@RpcReference</code> 信息， 并且不存在 Provider 返回值 Model ， 那么返回值类型是 Map ； 否则返回结果可能是和 Provider 具备相同
package 类的实例， 这个返回接口的类型还可能和加载顺序有关。 由于这种不确定性， 早期的 API 使用 <code>@Deprecated</code> 声明为废弃。 将
<code>responseType</code> 设置为 null ， 能够获得和早期 API 一样的效果。 </p>
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