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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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