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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.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 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;
  }
}