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1   /*
2    * Copyright (c) MuleSoft, Inc.  All rights reserved.  http://www.mulesoft.com
3    * The software in this package is published under the terms of the CPAL v1.0
4    * license, a copy of which has been included with this distribution in the
5    * LICENSE.txt file.
6    */
7   package org.mule.util.counters.impl;
8   
9   import org.mule.util.counters.CounterFactory.Type;
10  
11  public class InstantRate extends AggregateCounter
12  {
13  
14      private double firstTime;
15      private double lastTime;
16      private double value;
17  
18      public InstantRate(String name, AbstractCounter base)
19      {
20          super(name, Type.INSTANT_RATE, base);
21      }
22  
23      public double nextValue()
24      {
25          if (firstTime == 0 || firstTime == lastTime)
26          {
27              return Double.NaN;
28          }
29          else
30          {
31              return value / (lastTime - firstTime) * 1000.0;
32          }
33      }
34  
35      public void doCompute()
36      {
37          firstTime = lastTime;
38          lastTime = System.currentTimeMillis();
39          value = getBase().nextValue();
40      }
41  
42  }