| /** |
| * 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.yarn.client; |
| |
| import java.io.IOException; |
| import java.net.InetSocketAddress; |
| import java.security.PrivilegedAction; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.classification.InterfaceStability; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.security.UserGroupInformation; |
| import org.apache.hadoop.yarn.ipc.YarnRPC; |
| |
| @InterfaceAudience.Public |
| @InterfaceStability.Evolving |
| @SuppressWarnings("unchecked") |
| public class AHSProxy<T> { |
| |
| private static final Log LOG = LogFactory.getLog(AHSProxy.class); |
| |
| public static <T> T createAHSProxy(final Configuration conf, |
| final Class<T> protocol, InetSocketAddress ahsAddress) throws IOException { |
| LOG.info("Connecting to Application History server at " + ahsAddress); |
| return (T) getProxy(conf, protocol, ahsAddress); |
| } |
| |
| protected static <T> T getProxy(final Configuration conf, |
| final Class<T> protocol, final InetSocketAddress rmAddress) |
| throws IOException { |
| return UserGroupInformation.getCurrentUser().doAs( |
| new PrivilegedAction<T>() { |
| @Override |
| public T run() { |
| return (T) YarnRPC.create(conf).getProxy(protocol, rmAddress, conf); |
| } |
| }); |
| } |
| } |