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 backtype.storm;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.lang.management.GarbageCollectorMXBean;
  import java.lang.management.ManagementFactory;
  import java.util.Arrays;
  import java.util.List;
  
  public class GCState {
  
      private static final Logger LOG = LoggerFactory.getLogger(GCState.class);
  
      private static final List<String> youngGenCollectorNames = Arrays.asList(new String[]
              {
                      "Copy",
                      "ParNew",
                      "PS Scavenge",
                      "Garbage collection optimized for short pausetimes Young Collector",
                      "Garbage collection optimized for throughput Young Collector",
                      "Garbage collection optimized for deterministic pausetimes Young Collector",
                      "G1 Young Generation"
              });
  
      private static final List<String> OldGenCollectorNames = Arrays.asList(new String[]
              {
                      // Oracle (Sun) HotSpot
                      // -XX:+UseSerialGC
                      "MarkSweepCompact",
                      // -XX:+UseParallelGC and (-XX:+UseParallelOldGC or -XX:+UseParallelOldGCCompacting)
                      "PS MarkSweep",
                      // -XX:+UseConcMarkSweepGC
                      "ConcurrentMarkSweep",
  
                      // Oracle (BEA) JRockit
                      // -XgcPrio:pausetime
                      "Garbage collection optimized for short pausetimes Old Collector",
                      // -XgcPrio:throughput
                      "Garbage collection optimized for throughput Old Collector",
                      // -XgcPrio:deterministic
                      "Garbage collection optimized for deterministic pausetimes Old Collector",
  
                      //UseG1GC
                      "G1 Old Generation"
              });
  
  
      public static long getYoungGenCollectionCount(){
          long youngGCCounts = 0L;
          List<GarbageCollectorMXBean> list = ManagementFactory.getGarbageCollectorMXBeans();
          for (GarbageCollectorMXBean gmx : list) {
              if(youngGenCollectorNames.contains(gmx.getName())){
                  youngGCCounts+=gmx.getCollectionCount();
              }
          }
          return youngGCCounts;
      }
  
      public static long getOldGenCollectionCount(){
          long fullGCCounts = 0L;
          try {
              List<GarbageCollectorMXBean> list = ManagementFactory.getGarbageCollectorMXBeans();
              for (GarbageCollectorMXBean gmx : list) {
                  if(OldGenCollectorNames.contains(gmx.getName())){
                      fullGCCounts += gmx.getCollectionCount();
                  }
              }
          }catch (Throwable e){
              LOG.error("error !!!", e);
          }
          return fullGCCounts;
      }
  
      public static Object getOldGenCollectionTime() {
          long fullGCTime = 0L;
          List<GarbageCollectorMXBean> list = ManagementFactory.getGarbageCollectorMXBeans();
          for (GarbageCollectorMXBean gmx : list) {
              if(OldGenCollectorNames.contains(gmx.getName())){
                  fullGCTime+=gmx.getCollectionTime();
  
              }
          }
          return fullGCTime;
      }
  
      public static void main(String[] args) {
          System.out.println(getOldGenCollectionCount());
          System.out.println(getYoungGenCollectionCount());
      }
  }
  