How to use

hasChangeOccurred

method

in

org.eclipse.smarthome.io.rest.sitemap.internal.SitemapResource$BlockingStateChangeListener

/**
 * This method only returns when a change has occurred to any item on the
 * page to display or if the timeout is reached
 *
 * @param widgets
 *            the widgets of the page to observe
 */
private boolean waitForChanges(EList<Widget> widgets) {
  long startTime = (new Date()).getTime();
  boolean timeout = false;
  BlockingStateChangeListener listener = new BlockingStateChangeListener();
  // let's get all items for these widgets
  Set<GenericItem> items = getAllItems(widgets);
  for (GenericItem item : items) {
    item.addStateChangeListener(listener);
  }
  while (!listener.hasChangeOccurred() && !timeout) {
    timeout = (new Date()).getTime() - startTime > TIMEOUT_IN_MS;
    try {
      Thread.sleep(300);
    } catch (InterruptedException e) {
      timeout = true;
      break;
    }
  }
  for (GenericItem item : items) {
    item.removeStateChangeListener(listener);
  }
  return !timeout;
}

  item.addStateChangeListener(listener);
while (!listener.hasChangeOccurred() && !timeout) {
  timeout = (new Date()).getTime() - startTime > TIMEOUT_IN_MS;
  try {