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.psagent.client;
  
  import com.tencent.angel.common.location.Location;
  
  import java.io.IOException;
  import java.util.concurrent.ConcurrentHashMap;
  
  public class PSControlClientManager {
    /**
     * PS location to control rpc client
     */
    private final ConcurrentHashMap<Location, PSControlClient> pss = new ConcurrentHashMap<>();
  
    public PSControlClient getOrCreatePSClient(Location loc) throws IOException {
      PSControlClient ps = pss.get(loc);
      if (ps == null) {
        ps = pss.putIfAbsent(loc, createPSControlClient(loc));
        if (ps == null) {
          ps = pss.get(loc);
        }
      }
      return ps;
    }
  
    private PSControlClient createPSControlClient(Location loc) throws IOException {
      PSControlClient client = new PSControlClient();
      client.init(loc);
      return client;
    }
  }
  