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| |
| <h1 id="_1">调用第三方服务</h1> |
| <h2 id="_2">概念阐述</h2> |
| <p>第三方服务没有在服务中心注册，不存契约信息，Java Chassis 提供一种透明的方式访问第三方服务。 |
| 使用该功能调用第三方服务时，发往第三方服务的请求会经过consumer端handler链、HttpClientFilter的处理， |
| 即该功能支持对第三方服务调用的治理功能，并且也支持ServiceComb既有的用户自定义扩展处理机制。 </p> |
| <p>另外开发者也可以使用 <a href="../registry/local-registry.html">本地注册发现</a> 实现第三方调用， 两种方式实现的效果是一致的。 </p> |
| <h2 id="_3">示例代码</h2> |
| <ol> |
| <li> |
| <p>假设用户在本地开发了一个REST服务作为第三方REST服务，监听端口号为8080，其REST接口如契约所示：</p> |
| <pre><code>```yaml |
| --- |
| swagger: "2.0" |
| info: |
| version: "0.0.1" |
| title: "3rd party REST service for example" |
| basePath: "/rest" |
| consumes: |
| - "application/json" |
| produces: |
| - "text/plain" |
| paths: |
| /{pathVar}: |
| get: |
| operationId: "testPathVar" |
| parameters: |
| - name: "pathVar" |
| in: "path" |
| required: true |
| type: "string" |
| responses: |
| 200: |
| description: "response of 200, return \"Received, OK. [${pathVar}]\"" |
| schema: |
| type: "string" |
| ``` |
| </code></pre> |
| </li> |
| <li> |
| <p>为调用此服务，需要先根据其REST接口编写一个Java接口类，并打上参数注解。 |
| Java接口类的编写方式参照使用隐式契约开发SpringMVC和JAX-RS风格的provider方式。 |
| 接口代码示例如下：</p> |
| <pre><code>```java |
| @Path("/rest") |
| @Api(produces = MediaType.TEXT_PLAIN) |
| public interface VertxServerIntf { |
| @Path("/{pathVar}") |
| @GET |
| String testPathVar(@PathParam("pathVar") String pathVar); |
| } |
| ``` |
| </code></pre> |
| </li> |
| <li> |
| <p>通过实现 <code>ThirdServiceWithInvokerRegister</code> 注册第三方服务信息。 可以注册多个 schema。 </p> |
| <pre><code>```java |
| @Configuration |
| public class ThirdSvc extends ThirdServiceWithInvokerRegister { |
| public ThirdSvc() { |
| super("3rd-svc"); |
| |
| addSchema("schema-1", VertxServerIntf.class); |
| } |
| } |
| ``` |
| </code></pre> |
| <p><strong><em>注意：</em></strong> java chassis 2.1.3 以上版本才支持 ThirdServiceWithInvokerRegister。 </p> |
| </li> |
| <li> |
| <p>调用第三方服务，声明和调用方式与调用ServiceComb provider服务相同，此处以RPC调用方式为例。</p> |
| <pre><code>```java |
| VertxServerIntf client = BeanUtils.getContext().getBean(VertxServerIntf.class); |
| client.testPathVar(pathVar); |
| ``` |
| </code></pre> |
| </li> |
| <li> |
| <p>使用治理功能。使用治理功能的方法与普通的consumer调用provider场景类似。以限流策略为例，在consumer |
| 服务的microservice.yaml文件中进行如下配置:</p> |
| <pre><code>```yaml |
| servicecomb: |
| flowcontrol: |
| Consumer: |
| qps: |
| enabled: true |
| limit: |
| thirdPartyService: 1 |
| ``` |
| </code></pre> |
| <p>此时即将consumer调用名为<code>thirdPartyService</code>的第三方REST服务的QPS设置为1。当consumer调用<code>thirdPartyService</code>的流量高于1QPS时， |
| 将会得到<code>429 Too Many Requests</code>的<code>InvocationException</code>异常。</p> |
| </li> |
| <li> |
| <p>配置第三分服务的实例信息</p> |
| <pre><code>3rd-svc: |
| urls: |
| - http://localhost:8080 |
| </code></pre> |
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