/**
   * The dependent service is available and the bundle will start.
   *
   * @param dependentService the UIService this activator is waiting.
   */
  @Override
  public void start(Object dependentService) {
    if (logger.isDebugEnabled()) logger.debug("Update checker [STARTED]");

    ConfigurationService cfg = getConfiguration();

    if (OSUtils.IS_WINDOWS) {
      updateService = new Update();

      bundleContext.registerService(UpdateService.class.getName(), updateService, null);

      // Register the "Check for Updates" menu item if
      // the "Check for Updates" property isn't disabled.
      if (!cfg.getBoolean(CHECK_FOR_UPDATES_MENU_DISABLED_PROP, false)) {
        // Register the "Check for Updates" menu item.
        CheckForUpdatesMenuItemComponent checkForUpdatesMenuItemComponent =
            new CheckForUpdatesMenuItemComponent(Container.CONTAINER_HELP_MENU);

        Hashtable<String, String> toolsMenuFilter = new Hashtable<String, String>();
        toolsMenuFilter.put(Container.CONTAINER_ID, Container.CONTAINER_HELP_MENU.getID());

        bundleContext.registerService(
            PluginComponent.class.getName(), checkForUpdatesMenuItemComponent, toolsMenuFilter);
      }

      // Check for software update upon startup if enabled.
      if (cfg.getBoolean(UPDATE_ENABLED, true)) updateService.checkForUpdates(false);
    }

    if (cfg.getBoolean(CHECK_FOR_UPDATES_DAILY_ENABLED_PROP, false)) {
      logger.info("Scheduled update checking enabled");

      // Schedule a "check for updates" task that will run once a day
      int hoursToWait = calcHoursToWait();
      Runnable updateRunnable =
          new Runnable() {
            public void run() {
              logger.debug("Performing scheduled update check");
              getUpdateService().checkForUpdates(false);
            }
          };

      mUpdateExecutor = Executors.newSingleThreadScheduledExecutor();
      mUpdateExecutor.scheduleAtFixedRate(
          updateRunnable, hoursToWait, 24 * 60 * 60, TimeUnit.SECONDS);
    }

    if (logger.isDebugEnabled()) logger.debug("Update checker [REGISTERED]");
  }
 /**
  * Calculate the number of hour to wait until the first scheduled update check. This will only be
  * called if daily checking for config updates is enabled
  *
  * @return The number of hours to wait
  */
 private int calcHoursToWait() {
   // The hours to wait is the number of hours until midnight tonight (24
   // minus the current hour) plus the hour that the config says updates
   // should be
   return 24
       - Calendar.getInstance().get(Calendar.HOUR_OF_DAY)
       + configuration.getInt(CHECK_FOR_UPDATES_DAILY_TIME_PROP, 0);
 }