适用场景:对于一个dubbo消费者,广播调用多个dubbo 提供者,该消费者可以收集所有服务提供者的响应结果。
2.7.12
之后@Reference引入服务提供者,其中,令cluster=“broadcast2”,代表进行一个收集响应结果的广播调用。
广播调用所有服务提供者,逐个调用,并且可以完整的返回所有服务提供者的执行结果(正确或异常),并将所有服务提供者的响应结果存于RpcContext。
@RestController
public class TestServiceConsumer {
@Reference(interfaceClass = DubboHealthService.class,cluster = "broadcast2")
private DubboHealthService dubboHealthService;
@GetMapping("/health")
public String broadCast(){
try{
dubboHealthService.health();
}catch (Exception e){
Map<String, String> m = RpcContext.getServerContext().getAttachments();
return m.toString()+"|"+"fail";
}
Map<String, String> m = RpcContext.getServerContext().getAttachments();
return m.toString()+"|"+"success";
}
}
@Service
public class DubboHealthServiceImpl implements DubboHealthService {
@Override
public String health() {
// int i = 1/0;
return "i am provider2";
}
}
所有provider全部成功:
>curl http://localhost:8081/health
>{broadcast.results=[{"ip":"10.220.47.253","port":20880,"data":"i am provider1"},{"ip":"10.220.47.253","port":20881,"data":"i am provider2"}]}|success%
令其中一个provider执行除以零:
>curl http://localhost:8081/health
>{broadcast.results=[{"ip":"10.220.47.253","port":20880,"data":"i am provider1"},{"ip":"10.220.47.253","port":20881,"exceptionMsg":"/ by zero"}]}|success%