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package com.sun.enterprise.server.logging;

import java.util.Timer;

public class LogRotationTimer {
    private Timer rotationTimer;

    private LogRotationTimerTask rotationTimerTask;

    private static LogRotationTimer instance = new LogRotationTimer( );

    private LogRotationTimer( ) {
        rotationTimer = new Timer( );
    }

    public static LogRotationTimer getInstance( ) {
        return instance;
    }

    public void startTimer( LogRotationTimerTask timerTask ) {
        rotationTimerTask = timerTask;
        rotationTimer.schedule( rotationTimerTask, 
            timerTask.getRotationTimerValue( ) );
    }

    public void stopTimer( ) {
        rotationTimer.cancel( );
    }

    public void restartTimer( ) {
        // We will restart the timer only if the timerTask is set which
        // means user has set a value for LogRotation based on Time
        if( rotationTimerTask != null ) {
            rotationTimerTask.cancel( );
            rotationTimerTask = new LogRotationTimerTask( 
                // This is wierd, We need to have a fresh TimerTask object
                // to reschedule the work. 
                rotationTimerTask.getRotationTimerValueInMinutes( ) );
            rotationTimer.schedule( rotationTimerTask, 
                rotationTimerTask.getRotationTimerValue( ) );
        } 
    } 
}