hadoop WrappedFailoverProxyProvider 源码
haddop WrappedFailoverProxyProvider 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/server/namenode/ha/WrappedFailoverProxyProvider.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.hdfs.server.namenode.ha;
import java.io.IOException;
import org.apache.hadoop.io.retry.FailoverProxyProvider;
/**
* A NNFailoverProxyProvider implementation which wrapps old implementations
* directly implementing the {@link FailoverProxyProvider} interface.
*
* It is assumed that the old impelmentation is using logical URI.
*/
public class WrappedFailoverProxyProvider<T> extends
AbstractNNFailoverProxyProvider<T> {
private final FailoverProxyProvider<T> proxyProvider;
/**
* Wrap the given instance of an old FailoverProxyProvider.
*/
public WrappedFailoverProxyProvider(FailoverProxyProvider<T> provider) {
proxyProvider = provider;
}
@Override
public Class<T> getInterface() {
return proxyProvider.getInterface();
}
@Override
public synchronized ProxyInfo<T> getProxy() {
return proxyProvider.getProxy();
}
@Override
public void performFailover(T currentProxy) {
proxyProvider.performFailover(currentProxy);
}
/**
* Close the proxy,
*/
@Override
public synchronized void close() throws IOException {
proxyProvider.close();
}
/**
* Assume logical URI is used for old proxy provider implementations.
*/
@Override
public boolean useLogicalURI() {
return true;
}
}
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