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  *  The MIT License
  *  Copyright 2012 Sony Mobile Communications AB. All rights reserved.
  *  Permission is hereby granted, free of charge, to any person obtaining a copy
  *  of this software and associated documentation files (the "Software"), to deal
  *  in the Software without restriction, including without limitation the rights
  *  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 *  copies of the Software, and to permit persons to whom the Software is
 *  furnished to do so, subject to the following conditions:
 *  The above copyright notice and this permission notice shall be included in
 *  all copies or substantial portions of the Software.
package com.sonyericsson.hudson.plugins.gerrit.trigger.hudsontrigger;
Manages the timer that is used for each GerritTrigger TimerTask that is active.

Fredrik Abrahamson <>
public final class GerritTriggerTimer {

Average number of milliseconds in a second.
    private static final long MILLISECONDS_PER_SECOND = 1000;
Wait this many milliseconds before the first call to a TimerTask
    private static final long DELAY_MILLISECONDS  =  5000;
    private static final Logger logger = LoggerFactory.getLogger(GerritTriggerTimer.class);

The instance used by the singleton mechanism.
    private static GerritTriggerTimer instance = null;

The timer that is doing the actual scheduling.
    private Timer timer = null;

The private constructor (this is a singleton class).
    private GerritTriggerTimer() {
         = new Timer(true);

Returns the instance, and creates it first if needed.

the instance of this class
    public static GerritTriggerTimer getInstance() {
        if ( == null) {
             = new GerritTriggerTimer();
        return ;

Schedule a TimerTask according to the two constants above.

timerTask the subclass of TimerTask to be scheduled
    public void schedule(TimerTask timerTask) {
        long timerPeriod = 
                * PluginImpl.getInstance().getConfig().getDynamicConfigRefreshInterval();
        try {
        } catch (IllegalArgumentException iae) {
            .error("Attempted use of negative delay"iae);
        } catch (IllegalStateException ise) {
            .error("Attempted re-use of TimerTask"ise);
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