org.apache.hadoop.mapreduce.v2.hs.HSProxies.java Source code

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Here is the source code for org.apache.hadoop.mapreduce.v2.hs.HSProxies.java

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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.mapreduce.v2.hs;

import java.io.IOException;
import java.net.InetSocketAddress;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.classification.InterfaceAudience.Private;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.ipc.ProtobufRpcEngine;
import org.apache.hadoop.ipc.RPC;
import org.apache.hadoop.mapreduce.v2.api.HSAdminRefreshProtocol;
import org.apache.hadoop.mapreduce.v2.api.HSAdminRefreshProtocolPB;
import org.apache.hadoop.mapreduce.v2.hs.protocolPB.HSAdminRefreshProtocolClientSideTranslatorPB;
import org.apache.hadoop.net.NetUtils;
import org.apache.hadoop.security.RefreshUserMappingsProtocol;
import org.apache.hadoop.security.UserGroupInformation;
import org.apache.hadoop.security.protocolPB.RefreshUserMappingsProtocolClientSideTranslatorPB;
import org.apache.hadoop.security.protocolPB.RefreshUserMappingsProtocolPB;
import org.apache.hadoop.tools.GetUserMappingsProtocol;
import org.apache.hadoop.tools.protocolPB.GetUserMappingsProtocolClientSideTranslatorPB;
import org.apache.hadoop.tools.protocolPB.GetUserMappingsProtocolPB;

@Private
public class HSProxies {

    private static final Log LOG = LogFactory.getLog(HSProxies.class);

    @SuppressWarnings("unchecked")
    public static <T> T createProxy(Configuration conf, InetSocketAddress hsaddr, Class<T> xface,
            UserGroupInformation ugi) throws IOException {

        T proxy;
        if (xface == RefreshUserMappingsProtocol.class) {
            proxy = (T) createHSProxyWithRefreshUserMappingsProtocol(hsaddr, conf, ugi);
        } else if (xface == GetUserMappingsProtocol.class) {
            proxy = (T) createHSProxyWithGetUserMappingsProtocol(hsaddr, conf, ugi);
        } else if (xface == HSAdminRefreshProtocol.class) {
            proxy = (T) createHSProxyWithHSAdminRefreshProtocol(hsaddr, conf, ugi);
        } else {
            String message = "Unsupported protocol found when creating the proxy "
                    + "connection to History server: " + ((xface != null) ? xface.getClass().getName() : "null");
            LOG.error(message);
            throw new IllegalStateException(message);
        }
        return proxy;
    }

    private static RefreshUserMappingsProtocol createHSProxyWithRefreshUserMappingsProtocol(
            InetSocketAddress address, Configuration conf, UserGroupInformation ugi) throws IOException {
        RefreshUserMappingsProtocolPB proxy = (RefreshUserMappingsProtocolPB) createHSProxy(address, conf, ugi,
                RefreshUserMappingsProtocolPB.class, 0);
        return new RefreshUserMappingsProtocolClientSideTranslatorPB(proxy);
    }

    private static GetUserMappingsProtocol createHSProxyWithGetUserMappingsProtocol(InetSocketAddress address,
            Configuration conf, UserGroupInformation ugi) throws IOException {
        GetUserMappingsProtocolPB proxy = (GetUserMappingsProtocolPB) createHSProxy(address, conf, ugi,
                GetUserMappingsProtocolPB.class, 0);
        return new GetUserMappingsProtocolClientSideTranslatorPB(proxy);
    }

    private static HSAdminRefreshProtocol createHSProxyWithHSAdminRefreshProtocol(InetSocketAddress hsaddr,
            Configuration conf, UserGroupInformation ugi) throws IOException {
        HSAdminRefreshProtocolPB proxy = (HSAdminRefreshProtocolPB) createHSProxy(hsaddr, conf, ugi,
                HSAdminRefreshProtocolPB.class, 0);
        return new HSAdminRefreshProtocolClientSideTranslatorPB(proxy);
    }

    private static Object createHSProxy(InetSocketAddress address, Configuration conf, UserGroupInformation ugi,
            Class<?> xface, int rpcTimeout) throws IOException {
        RPC.setProtocolEngine(conf, xface, ProtobufRpcEngine.class);
        Object proxy = RPC.getProxy(xface, RPC.getProtocolVersion(xface), address, ugi, conf,
                NetUtils.getDefaultSocketFactory(conf), rpcTimeout);
        return proxy;
    }
}