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package org.mule.util.counters.impl; |
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import org.mule.util.counters.CounterFactory.Type; |
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public class Delta extends AggregateCounter |
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{ |
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18 | 2 | private double first = 0.0; |
19 | 2 | private double second = 0.0; |
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public Delta(String name, AbstractCounter base) |
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{ |
23 | 2 | super(name, Type.DELTA, base); |
24 | 2 | } |
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public double nextValue() |
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{ |
28 | 10 | if (Double.isNaN(first) || Double.isNaN(second)) |
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{ |
30 | 0 | return Double.NaN; |
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} |
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else |
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{ |
34 | 10 | return second - first > 0.0 ? second - first : 0.0; |
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} |
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} |
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public void doCompute() |
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{ |
40 | 8 | first = second; |
41 | 8 | second = this.getBase().nextValue(); |
42 | 8 | } |
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} |