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.AsmGaugeSnapshot;
  import com.alibaba.jstorm.common.metric.snapshot.AsmSnapshot;
  import com.codahale.metrics.Gauge;
  
  import java.util.Map;
  
  /**
   * gauges cannot be aggregated.
   */
  public class AsmGauge extends AsmMetric<Gauge> {
  
      protected Gauge gauge;
  
      public AsmGauge(Gauge<Double> gauge) {
          this.gauge = gauge;
      }
  
      @Override
      public void update(Number obj) {
          // nothing to do for gauges.
      }
  
      @Override
      public void updateTime(long obj) {
          throw new RuntimeException("please use update method!");
      }
  
      @Override
      public AsmMetric clone() {
          AsmMetric metric = new AsmGauge(this.gauge);
          metric.setMetricName(this.getMetricName());
          return metric;
      }
  
      @Override
      public Map<Integer, Gauge> getWindowMetricMap() {
          return null;
      }
  
      @Override
      public Gauge mkInstance() {
          return null;
      }
  
      @Override
      protected void doFlush() {
          // nothing to do for gauges.
      }
  
      @Override
      protected void updateSnapshot(int window) {
          double v = (Double) gauge.getValue();
          AsmSnapshot snapshot = new AsmGaugeSnapshot().setValue(v)
                  .setTs(System.currentTimeMillis()).setMetricId(metricId);
          snapshots.put(window, snapshot);
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public Object getValue(Integer window) {
          return this.gauge.getValue();
      }
  }
  