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