001/**
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018
019package org.apache.hadoop.tools.protocolPB;
020
021import java.io.Closeable;
022import java.io.IOException;
023import org.apache.hadoop.ipc.ProtobufHelper;
024import org.apache.hadoop.ipc.ProtocolMetaInterface;
025import org.apache.hadoop.ipc.RPC;
026import org.apache.hadoop.ipc.RpcClientUtil;
027import org.apache.hadoop.tools.GetUserMappingsProtocol;
028import org.apache.hadoop.tools.proto.GetUserMappingsProtocolProtos.GetGroupsForUserRequestProto;
029import org.apache.hadoop.tools.proto.GetUserMappingsProtocolProtos.GetGroupsForUserResponseProto;
030
031import com.google.protobuf.RpcController;
032import com.google.protobuf.ServiceException;
033
034public class GetUserMappingsProtocolClientSideTranslatorPB implements
035    ProtocolMetaInterface, GetUserMappingsProtocol, Closeable {
036
037  /** RpcController is not used and hence is set to null */
038  private final static RpcController NULL_CONTROLLER = null;
039  private final GetUserMappingsProtocolPB rpcProxy;
040  
041  public GetUserMappingsProtocolClientSideTranslatorPB(
042      GetUserMappingsProtocolPB rpcProxy) {
043    this.rpcProxy = rpcProxy;
044  }
045
046  @Override
047  public void close() throws IOException {
048    RPC.stopProxy(rpcProxy);
049  }
050
051  @Override
052  public String[] getGroupsForUser(String user) throws IOException {
053    GetGroupsForUserRequestProto request = GetGroupsForUserRequestProto
054        .newBuilder().setUser(user).build();
055    GetGroupsForUserResponseProto resp;
056    try {
057      resp = rpcProxy.getGroupsForUser(NULL_CONTROLLER, request);
058    } catch (ServiceException se) {
059      throw ProtobufHelper.getRemoteException(se);
060    }
061    return resp.getGroupsList().toArray(new String[resp.getGroupsCount()]);
062  }
063
064  @Override
065  public boolean isMethodSupported(String methodName) throws IOException {
066    return RpcClientUtil.isMethodSupported(rpcProxy,
067        GetUserMappingsProtocolPB.class, RPC.RpcKind.RPC_PROTOCOL_BUFFER,
068        RPC.getProtocolVersion(GetUserMappingsProtocolPB.class), methodName);
069  }
070}