@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);
}
}
