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/*
 * 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;
  }

}