1 /** 2 * Licensed to the Apache Software Foundation (ASF) under one 3 * or more contributor license agreements. See the NOTICE file 4 * distributed with this work for additional information 5 * regarding copyright ownership. The ASF licenses this file 6 * to you under the Apache License, Version 2.0 (the 7 * "License"); you may not use this file except in compliance 8 * with the License. You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, software 13 * distributed under the License is distributed on an "AS IS" BASIS, 14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 * See the License for the specific language governing permissions and 16 * limitations under the License. 17 */ 18 package org.apache.hadoop.hdfs.server.namenode.ha; 19 20 import java.io.Closeable; 21 import java.io.IOException; 22 import java.net.InetSocketAddress; 23 import java.net.URI; 24 25 import org.apache.hadoop.conf.Configuration; 26 import org.apache.hadoop.hdfs.server.protocol.NamenodeProtocols; 27 import org.apache.hadoop.io.retry.FailoverProxyProvider; 28 import org.apache.hadoop.ipc.RPC; 29 import org.apache.hadoop.security.UserGroupInformation; 30 31 import com.google.common.base.Preconditions; 32 33 /** 34 * A NNFailoverProxyProvider implementation which wrapps old implementations 35 * directly implementing the {@link FailoverProxyProvider} interface. 36 * 37 * It is assumed that the old impelmentation is using logical URI. 38 */ 39 public class WrappedFailoverProxyProvider<T> extends 40 AbstractNNFailoverProxyProvider<T> { 41 private final FailoverProxyProvider<T> proxyProvider; 42 43 /** 44 * Wrap the given instance of an old FailoverProxyProvider. 45 */ WrappedFailoverProxyProvider(FailoverProxyProvider<T> provider)46 public WrappedFailoverProxyProvider(FailoverProxyProvider<T> provider) { 47 proxyProvider = provider; 48 } 49 50 @Override getInterface()51 public Class<T> getInterface() { 52 return proxyProvider.getInterface(); 53 } 54 55 @Override getProxy()56 public synchronized ProxyInfo<T> getProxy() { 57 return proxyProvider.getProxy(); 58 } 59 60 @Override performFailover(T currentProxy)61 public void performFailover(T currentProxy) { 62 proxyProvider.performFailover(currentProxy); 63 } 64 65 /** 66 * Close the proxy, 67 */ 68 @Override close()69 public synchronized void close() throws IOException { 70 proxyProvider.close(); 71 } 72 73 /** 74 * Assume logical URI is used for old proxy provider implementations. 75 */ 76 @Override useLogicalURI()77 public boolean useLogicalURI() { 78 return true; 79 } 80 } 81