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.common.metric;
  
  
  import com.alibaba.jstorm.common.metric.snapshot.AsmCounterSnapshot;
  import com.alibaba.jstorm.common.metric.snapshot.AsmSnapshot;
  import com.alibaba.jstorm.metric.MetricUtils;
  import com.codahale.metrics.Counter;
  
  import com.google.common.annotations.VisibleForTesting;
  import java.util.Map;
  import java.util.concurrent.ConcurrentHashMap;
  
  /**
   * counter wrapper. note that counter is a little special, every snapshot we only return the delta value instead of
   * total value, which prevents data loss if certain tasks are killed.
   */
  public class AsmCounter extends AsmMetric<Counter> {
  
      private final Map<Integer, Counter> counterMap = new ConcurrentHashMap<>();
      private final Counter unFlushed = new Counter();
  
      public AsmCounter() {
          super();
          for (int win : windowSeconds) {
              counterMap.put(win, new Counter());
          }
      }
  
      public void inc() {
          update(1);
      }
  
      /**
       * {@inheritDoc}
       */
      @VisibleForTesting
      public Object getValue(Integer win) {
          synchronized (this) {
              return unFlushed.getCount() + counterMap.get(win).getCount();
          }
      }
  
      @Override
      public void update(Number val) {
          this.unFlushed.inc(val.longValue());
      }
  
      @Override
      public void updateTime(long obj) {
          throw new RuntimeException("please use update method!");
      }
  
      /**
       * flush temp counter data to all windows & assoc metrics.
       */
      protected void doFlush() {
          long v;
          synchronized (unFlushed) {
              v = unFlushed.getCount();
          }
          for (Counter counter : counterMap.values()) {
              counter.inc(v);
          }
          if (MetricUtils.metricAccurateCal) {
              for (AsmMetric assocMetric : assocMetrics) {
                  assocMetric.updateDirectly(v);
              }
          }
          this.unFlushed.dec(v);
      }
  
      @Override
      public Map<Integer, Counter> getWindowMetricMap() {
          return counterMap;
      }
  
      @Override
      public Counter mkInstance() {
          return new Counter();
      }
  
      @Override
      protected void updateSnapshot(int window) {
          Counter counter = counterMap.get(window);
          if (counter != null) {
              AsmSnapshot snapshot = new AsmCounterSnapshot().setValue(counter.getCount())
                      .setTs(System.currentTimeMillis()).setMetricId(metricId);
              snapshots.put(window, snapshot);
          }
      }
  
      @Override
      public AsmMetric clone() {
          return new AsmCounter();
      }
  }
  