org.apache.hadoop.yarn.client.AHSProxy.java Source code

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/**
 * 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);
            }
        });
    }
}