dubbo FailsafeClusterInvoker 源码
dubbo FailsafeClusterInvoker 代码
文件路径：/dubbo-cluster/src/main/java/org/apache/dubbo/rpc/cluster/support/FailsafeClusterInvoker.java
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.dubbo.rpc.cluster.support;
import org.apache.dubbo.common.logger.ErrorTypeAwareLogger;
import org.apache.dubbo.common.logger.LoggerFactory;
import org.apache.dubbo.rpc.AsyncRpcResult;
import org.apache.dubbo.rpc.Invocation;
import org.apache.dubbo.rpc.Invoker;
import org.apache.dubbo.rpc.Result;
import org.apache.dubbo.rpc.RpcException;
import org.apache.dubbo.rpc.cluster.Directory;
import org.apache.dubbo.rpc.cluster.LoadBalance;
import java.util.List;
import static org.apache.dubbo.common.constants.LoggerCodeConstants.CLUSTER_ERROR_RESPONSE;
/**
* When invoke fails, log the error message and ignore this error by returning an empty Result.
* Usually used to write audit logs and other operations
*
* <a href="http://en.wikipedia.org/wiki/Fail-safe">Fail-safe</a>
*
*/
public class FailsafeClusterInvoker<T> extends AbstractClusterInvoker<T> {
private static final ErrorTypeAwareLogger logger = LoggerFactory.getErrorTypeAwareLogger(FailsafeClusterInvoker.class);
public FailsafeClusterInvoker(Directory<T> directory) {
super(directory);
}
@Override
public Result doInvoke(Invocation invocation, List<Invoker<T>> invokers, LoadBalance loadbalance) throws RpcException {
try {
checkInvokers(invokers, invocation);
Invoker<T> invoker = select(loadbalance, invocation, invokers, null);
return invokeWithContext(invoker, invocation);
} catch (Throwable e) {
logger.error(CLUSTER_ERROR_RESPONSE,"Failsafe for provider exception","","Failsafe ignore exception: " + e.getMessage(),e);
return AsyncRpcResult.newDefaultAsyncResult(null, null, invocation); // ignore
}
}
}
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