content: /**
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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
   *
   * http://www.apache.org/licenses/LICENSE-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.alibaba.jstorm.oversold;
  
  import com.alibaba.jstorm.client.ConfigExtension;
  
  import java.util.Map;
  
  /**
   * @author fengjian
   * @since 16/11/14
   */
  public class GcStrategyManager {
  
  
      public static GcStrategy getGcStrategy(Map conf) {
          double memWeight = ConfigExtension.getSupervisorSlotsPortMemWeight(conf);
          if (memWeight >= 1) memWeight = 1;
          else if (memWeight <= 0.5) memWeight = 0.5;
          GcStrategy gcStrategy = new GcStrategy();
          gcStrategy.setGcType(GC.ConcMarkSweepGC);
          gcStrategy.setInitiatingOccupancyFraction(memWeight * 0.68);
          gcStrategy.setUseInitiatingOccupancyOnly(true);
          gcStrategy.setSurvivorRatio(4);
          return gcStrategy;
      }
  }
  