content: /*
   * Tencent is pleased to support the open source community by making Angel available.
   *
   * Copyright (C) 2017-2018 THL A29 Limited, a Tencent company. All rights reserved.
   *
   * Licensed 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
   *
   * https://opensource.org/licenses/Apache-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 com.tencent.angel.master.client;
  
  import com.google.protobuf.ServiceException;
  import com.tencent.angel.common.location.Location;
  import com.tencent.angel.ipc.TConnection;
  import com.tencent.angel.ipc.TConnectionManager;
  import com.tencent.angel.master.app.AMContext;
  import com.tencent.angel.protobuf.generated.MasterPSServiceProtos.GetThreadStackRequest;
  import com.tencent.angel.ps.PSAttemptId;
  import com.tencent.angel.ps.server.control.PSProtocol;
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  
  import java.io.IOException;
  
  /**
   * Master to ps rpc client, just for get thread stack of ps.
   */
  public class PSClient implements PSClientInterface {
    private static final Log LOG = LogFactory.getLog(PSClient.class);
    /**
     * master context
     */
    private final AMContext context;
  
    /**
     * connection from master to the worker
     */
    private TConnection connection;
  
    /**
     * rpc protocol
     */
    private PSProtocol ps;
  
    /**
     * Create a PSClient
     *
     * @param context   master context
     * @param attemptId ps attempt id
     * @throws IOException
     */
    public PSClient(AMContext context, PSAttemptId attemptId) throws IOException {
      this.context = context;
      this.connection = TConnectionManager.getConnection(context.getConf());
  
      Location psLoc = context.getParameterServerManager().getParameterServer(attemptId.getPsId())
        .getPSAttempt(attemptId).getLocation();
      LOG.info("psLoc= " + psLoc.toString());
      LOG.info("psLoc.getIp()=    " + psLoc.getIp() + "   " + "          psLoc.getPort()=   " + psLoc
        .getPort());
      this.ps = connection.getPSService(psLoc.getIp(), psLoc.getPort());
    }
  
    @Override public String getThreadStack() throws ServiceException {
      PSProtocol pSProtocol = getPS();
      GetThreadStackRequest request = GetThreadStackRequest.newBuilder().build();
      return pSProtocol.psThreadStack(null, request).getStack();
    }
  
    private PSProtocol getPS() {
      return ps;
    }
  
  }
  