<dubbo:reference id="cacheService" interface="com.example.CacheService"

loadbalance="consistenthash" consistenthash.nodes="4" consistenthash.vnodes="100" />

// 自定义扩展点实现类

public class CacheConsistencyExtension implements Filter {

private CacheService cacheService; // 缓存服务

public void setCacheService(CacheService cacheService) {

this.cacheService = cacheService;

}

@Override

public Result invoke(Invoker<?> invoker, Invocation invocation) throws RpcException {

try {

// 获取请求参数

String key = (String) invocation.getArguments()[0];

String value = (String) invocation.getArguments()[1];

// 执行写入缓存操作

cacheService.writeToCache(key, value);

// 继续执行后续的调用链

return invoker.invoke(invocation);

} catch (Exception e) {

// 处理异常情况

// ...

return new RpcResult(); // 返回一个空的RpcResult

}

}

}

<!-- 注册自定义扩展点 -->

<bean id="cacheConsistencyExtension" class="com.example.CacheConsistencyExtension">

<property name="cacheService" ref="cacheService" />

</bean>

<!-- 注册自定义扩展点到Dubbo -->

<dubbo:protocol name="dubbo" filter="cacheConsistencyExtension" />

// 发送请求时调用CacheService接口

@Autowired

private CacheService cacheService;

public void processRequest(Request request) {

String key = request.getKey();

String value = request.getValue();

// 通过Dubbo进行远程调用

cacheService.writeToCache(key, value);

}