@Override public void added(Item item) { initialize(item); if (item instanceof GenericItem) { GenericItem genericItem = (GenericItem) item; genericItem.addStateChangeListener(this); } }
/** * Handles the "restoreOnStartup" strategy for the item. If the item state is still undefined when * entering this method, all persistence configurations are checked, if they have the * "restoreOnStartup" strategy configured for the item. If so, the item state will be set to its * last persisted value. * * @param item the item to restore the state for */ protected void initialize(Item item) { // get the last persisted state from the persistence service if no state is yet set if (item.getState().equals(UnDefType.NULL) && item instanceof GenericItem) { for (Entry<String, List<PersistenceConfiguration>> entry : persistenceConfigurations.entrySet()) { String serviceName = entry.getKey(); for (PersistenceConfiguration config : entry.getValue()) { if (hasStrategy(serviceName, config, GlobalStrategies.RESTORE)) { if (appliesToItem(config, item)) { PersistenceService service = persistenceServices.get(serviceName); if (service instanceof QueryablePersistenceService) { QueryablePersistenceService queryService = (QueryablePersistenceService) service; FilterCriteria filter = new FilterCriteria().setItemName(item.getName()).setPageSize(1); Iterable<HistoricItem> result = queryService.query(filter); Iterator<HistoricItem> it = result.iterator(); if (it.hasNext()) { HistoricItem historicItem = it.next(); GenericItem genericItem = (GenericItem) item; genericItem.removeStateChangeListener(this); genericItem.setState(historicItem.getState()); genericItem.addStateChangeListener(this); logger.debug( "Restored item state from '{}' for item '{}' -> '{}'", new Object[] { DateFormat.getDateTimeInstance().format(historicItem.getTimestamp()), item.getName(), historicItem.getState().toString() }); return; } } else if (service != null) { logger.warn( "Failed to restore item states as persistence service '{}' can not be queried.", serviceName); } } } } } } }
/** * 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; }
private void internalItemAdded(Item item) { if (item instanceof GenericItem) { GenericItem genericItem = (GenericItem) item; genericItem.addStateChangeListener(this); } }