hadoop DefaultFailoverProxyProvider 源码
haddop DefaultFailoverProxyProvider 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/retry/DefaultFailoverProxyProvider.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.hadoop.io.retry;
import java.io.IOException;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.ipc.RPC;
/**
* An implementation of {@link FailoverProxyProvider} which does nothing in the
* event of failover, and always returns the same proxy object.
*/
@InterfaceStability.Evolving
public class DefaultFailoverProxyProvider<T> implements FailoverProxyProvider<T> {
private T proxy;
private Class<T> iface;
public DefaultFailoverProxyProvider(Class<T> iface, T proxy) {
this.proxy = proxy;
this.iface = iface;
}
@Override
public Class<T> getInterface() {
return iface;
}
@Override
public ProxyInfo<T> getProxy() {
return new ProxyInfo<T>(proxy, null);
}
@Override
public void performFailover(T currentProxy) {
// Nothing to do.
}
@Override
public void close() throws IOException {
RPC.stopProxy(proxy);
}
}
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