package mxdx2;

//服务总线接口（中介者模式）
public interface ServiceBus {
 // 注册服务
 void registerService(String serviceName, ServiceEndpoint endpoint);
 // 路由请求
 Object routeRequest(String serviceName, String method, Object... params);
 // 注册监控器
 void registerMonitor(ServiceMonitor monitor);
}

//服务总线实现
public class EnterpriseServiceBus implements ServiceBus {
 // 服务注册表：服务名 -> 服务端点
 private Map<String, ServiceEndpoint> serviceRegistry = new ConcurrentHashMap<>();
 // 监控器列表
 private List<ServiceMonitor> monitors = new CopyOnWriteArrayList<>();

 @Override
 public void registerService(String serviceName, ServiceEndpoint endpoint) {
     serviceRegistry.put(serviceName, endpoint);
     notifyMonitor("REGISTER", serviceName, "Service registered");
 }

 @Override
 public Object routeRequest(String serviceName, String method, Object... params) {
     ServiceEndpoint endpoint = serviceRegistry.get(serviceName);
     if (endpoint == null) {
         notifyMonitor("ERROR", serviceName, "Service not found");
         throw new ServiceNotFoundException("Service " + serviceName + " not found");
     }

     try {
         long startTime = System.currentTimeMillis();
         Object result = endpoint.invoke(method, params);
         long cost = System.currentTimeMillis() - startTime;
         notifyMonitor("INVOKE", serviceName, "Success, cost=" + cost + "ms");
         return result;
     } catch (Exception e) {
         notifyMonitor("ERROR", serviceName, "Invocation failed: " + e.getMessage());
         throw new ServiceInvocationException(e);
     }
 }

 @Override
 public void registerMonitor(ServiceMonitor monitor) {
     monitors.add(monitor);
 }

 // 通知监控器
 private void notifyMonitor(String type, String serviceName, String message) {
     ServiceEvent event = new ServiceEvent(type, serviceName, message, System.currentTimeMillis());
     for (ServiceMonitor monitor : monitors) {
         monitor.onEvent(event);
     }
 }
}