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package com.vladium.utils.timing;
// ----------------------------------------------------------------------------
/**
* A package-private implementation of {@link ITimer} based around Java system
* timer [<code>System.currentTimeMillis()</code> method]. It is used when
* <code>HRTimer</code> implementation is unavailable.<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 JavaSystemTimer 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 = System.currentTimeMillis ();
}
public void stop ()
{
// latch stop time in a local var before doing anything else:
final long data = System.currentTimeMillis ();
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: ...............................................................
private int m_state; // used to keep track of timer state
private long m_data; // timing data
} // end of class
// ----------------------------------------------------------------------------
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