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87 lines
2.9 KiB
87 lines
2.9 KiB
11 years ago
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package com.vladium.utils.timing;
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// ----------------------------------------------------------------------------
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/**
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* A package-private implementation of {@link ITimer} based around native
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* <code>getTime</code> method. It will work on any platform for which a JNI
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* implementation of "hrtlib" library is available.<P>
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*
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* {@link TimerFactory} acts as the Factory for this class.<P>
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*
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* MT-safety: an instance of this class is safe to be used within the same
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* thread only.
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*
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* @author (C) <a href="mailto:vroubtsov@illinoisalumni.org">Vlad Roubtsov</a>, 2002
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*/
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final class HRTimer implements ITimer, ITimerConstants
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{
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// public: ................................................................
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public void start ()
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{
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if (DO_STATE_CHECKS)
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{
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if (m_state != STATE_READY)
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throw new IllegalStateException (this + ": start() must be called from READY state, current state is " + STATE_NAMES [m_state]);
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}
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if (DO_STATE_CHECKS) m_state = STATE_STARTED;
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m_data = getTime ();
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}
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public void stop ()
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{
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// latch stop time in a local var before doing anything else:
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final double data = getTime ();
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if (DO_STATE_CHECKS)
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{
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if (m_state != STATE_STARTED)
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throw new IllegalStateException (this + ": stop() must be called from STARTED state, current state is " + STATE_NAMES [m_state]);
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}
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m_data = data - m_data;
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if (DO_STATE_CHECKS) m_state = STATE_STOPPED;
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}
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public double getDuration ()
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{
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if (DO_STATE_CHECKS)
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{
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if (m_state != STATE_STOPPED)
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throw new IllegalStateException (this + ": getDuration() must be called from STOPPED state, current state is " + STATE_NAMES [m_state]);
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}
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return m_data;
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}
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public void reset ()
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{
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if (DO_STATE_CHECKS) m_state = STATE_READY;
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}
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// protected: .............................................................
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// package: ...............................................................
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// private: ...............................................................
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/*
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* This is supposed to return a fractional count of milliseconds elapsed
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* since some indeterminate moment in the past. The exact starting point
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* is not relevant because this timer class reports time differences only.
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*
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* JNI code in HRTIMER_LIB library is supposed to implement this.
*/
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private static native double getTime ();
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private int m_state; // used to keep track of timer state
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private double m_data; // timing data
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private static final String HRTIMER_LIB = "hrtlib";
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} // end of class
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// ----------------------------------------------------------------------------
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