/* | |
* Copyright 1999-2011 Alibaba Group. | |
* | |
* Licensed under the Apache License, Version 2.0 (the "License"); | |
* you may not use this file except in compliance with the License. | |
* You may obtain a copy of the License at | |
* | |
* http://www.apache.org/licenses/LICENSE-2.0 | |
* | |
* Unless required by applicable law or agreed to in writing, software | |
* distributed under the License is distributed on an "AS IS" BASIS, | |
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
* See the License for the specific language governing permissions and | |
* limitations under the License. | |
*/ | |
package com.alibaba.dubbo.rpc.filter; | |
import com.alibaba.dubbo.common.Constants; | |
import com.alibaba.dubbo.common.URL; | |
import com.alibaba.dubbo.common.extension.Activate; | |
import com.alibaba.dubbo.rpc.Filter; | |
import com.alibaba.dubbo.rpc.Invocation; | |
import com.alibaba.dubbo.rpc.Invoker; | |
import com.alibaba.dubbo.rpc.Result; | |
import com.alibaba.dubbo.rpc.RpcException; | |
import com.alibaba.dubbo.rpc.RpcStatus; | |
/** | |
* ThreadLimitInvokerFilter | |
* | |
* @author william.liangf | |
*/ | |
@Activate(group = Constants.PROVIDER, value = Constants.EXECUTES_KEY) | |
public class ExecuteLimitFilter implements Filter { | |
public Result invoke(Invoker<?> invoker, Invocation invocation) throws RpcException { | |
URL url = invoker.getUrl(); | |
String methodName = invocation.getMethodName(); | |
int max = url.getMethodParameter(methodName, Constants.EXECUTES_KEY, 0); | |
if (max > 0) { | |
RpcStatus count = RpcStatus.getStatus(url, invocation.getMethodName()); | |
if (count.getActive() >= max) { | |
throw new RpcException("Failed to invoke method " + invocation.getMethodName() + " in provider " + url + ", cause: The service using threads greater than <dubbo:service executes=\"" + max + "\" /> limited."); | |
} | |
} | |
long begin = System.currentTimeMillis(); | |
boolean isException = false; | |
RpcStatus.beginCount(url, methodName); | |
try { | |
Result result = invoker.invoke(invocation); | |
return result; | |
} catch (Throwable t) { | |
isException = true; | |
if(t instanceof RuntimeException) { | |
throw (RuntimeException) t; | |
} | |
else { | |
throw new RpcException("unexpected exception when ExecuteLimitFilter", t); | |
} | |
} | |
finally { | |
RpcStatus.endCount(url, methodName, System.currentTimeMillis() - begin, isException); | |
} | |
} | |
} |