DUBBO-469 泛化调用监控统计的方法名不正确

dubbo-monitor/dubbo-monitor-api/src/main/java/com/alibaba/dubbo/monitor/support/MonitorFilter.java

@@ -34,6 +34,7 @@ import com.alibaba.dubbo.rpc.Invoker;
 import com.alibaba.dubbo.rpc.Result;
 import com.alibaba.dubbo.rpc.RpcContext;
 import com.alibaba.dubbo.rpc.RpcException;
+import com.alibaba.dubbo.rpc.service.GenericService;
  
 /**
  * MonitorFilter. (SPI, Singleton, ThreadSafe)
@@ -83,6 +84,11 @@ public class MonitorFilter implements Filter {
             String application = invoker.getUrl().getParameter(Constants.APPLICATION_KEY);
             String service = invoker.getInterface().getName(); // 获取服务名称
             String method = invocation.getMethodName(); // 获取方法名
+            if (Constants.$INVOKE.equals(method) 
+            		&& invocation.getArguments().length > 0 
+            		&& invocation.getArguments()[0] instanceof String) {
+            	method = (String) invocation.getArguments()[0];
+            }
             URL url = invoker.getUrl().getUrlParameter(Constants.MONITOR_KEY);
             Monitor monitor = monitorFactory.getMonitor(url);
             int localPort;