content: package act.metric;
  
  /*-
   * #%L
   * ACT Framework
   * %%
   * Copyright (C) 2014 - 2017 ActFramework
   * %%
   * 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
   * 
   *      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.
   * #L%
   */
  
  import org.osgl.$;
  
  /**
   * A simple implementation of {@link Timer}
   */
  public class SimpleTimer implements Timer {
  
      private String name;
      private MetricStore metricStore;
      private long start;
      private long duration;
  
      public SimpleTimer(String name, MetricStore metricStore) {
          this.name = $.requireNotNull(name);
          this.metricStore = $.requireNotNull(metricStore);
          this.start = $.ns();
          metricStore.onTimerStart(name);
      }
  
      @Override
      public String name() {
          return name;
      }
  
      @Override
      public void stop() {
          duration = $.ns() - start;
          metricStore.onTimerStop(this);
      }
  
      @Override
      public long ns() {
          return duration;
      }
  
      @Override
      public void close() {
          stop();
      }
  }
  