public Collection<EventBean> getSnapshot(
EPStatementHandle createWindowStmtHandle, Viewable parent) {
createWindowStmtHandle.getStatementLock().acquireReadLock();
try {
Iterator<EventBean> it = parent.iterator();
if (!it.hasNext()) {
return Collections.EMPTY_LIST;
}
ArrayDeque<EventBean> list = new ArrayDeque<EventBean>();
while (it.hasNext()) {
RevisionEventBeanDeclared fullRevision = (RevisionEventBeanDeclared) it.next();
MultiKeyUntyped key = fullRevision.getKey();
RevisionStateDeclared state = statePerKey.get(key);
list.add(state.getLastEvent());
}
return list;
} finally {
createWindowStmtHandle.getStatementLock().releaseReadLock();
}
}
public void onUpdate(
EventBean[] newData,
EventBean[] oldData,
NamedWindowRootView namedWindowRootView,
NamedWindowIndexRepository indexRepository) {
// If new data is filled, it is not a delete
if ((newData == null) || (newData.length == 0)) {
// we are removing an event
RevisionEventBeanDeclared revisionEvent = (RevisionEventBeanDeclared) oldData[0];
MultiKeyUntyped key = revisionEvent.getKey();
statePerKey.remove(key);
// Insert into indexes for fast deletion, if there are any
for (EventTable table : indexRepository.getTables()) {
table.remove(oldData);
}
// make as not the latest event since its due for removal
revisionEvent.setLatest(false);
namedWindowRootView.updateChildren(null, oldData);
return;
}
RevisionEventBeanDeclared revisionEvent = (RevisionEventBeanDeclared) newData[0];
EventBean underlyingEvent = revisionEvent.getUnderlyingFullOrDelta();
EventType underyingEventType = underlyingEvent.getEventType();
// obtain key values
MultiKeyUntyped key = null;
RevisionTypeDesc typesDesc = null;
boolean isBaseEventType = false;
if (underyingEventType == baseEventType) {
key = PropertyUtility.getKeys(underlyingEvent, fullKeyGetters);
isBaseEventType = true;
} else {
typesDesc = typeDescriptors.get(underyingEventType);
// if this type cannot be found, check all supertypes, if any
if (typesDesc == null) {
Iterator<EventType> superTypes = underyingEventType.getDeepSuperTypes();
if (superTypes != null) {
EventType superType;
for (; superTypes.hasNext(); ) {
superType = superTypes.next();
if (superType == baseEventType) {
key = PropertyUtility.getKeys(underlyingEvent, fullKeyGetters);
isBaseEventType = true;
break;
}
typesDesc = typeDescriptors.get(superType);
if (typesDesc != null) {
typeDescriptors.put(underyingEventType, typesDesc);
key = PropertyUtility.getKeys(underlyingEvent, typesDesc.getKeyPropertyGetters());
break;
}
}
}
} else {
key = PropertyUtility.getKeys(underlyingEvent, typesDesc.getKeyPropertyGetters());
}
if (key == null) {
log.warn(
"Ignoring event of event type '"
+ underyingEventType
+ "' for revision processing type '"
+ revisionEventTypeName);
return;
}
}
// get the state for this key value
RevisionStateDeclared revisionState = statePerKey.get(key);
// Delta event and no full
if ((!isBaseEventType) && (revisionState == null)) {
return; // Ignore the event, its a delta and we don't currently have a full event for it
}
// New full event
if (revisionState == null) {
revisionState = new RevisionStateDeclared(underlyingEvent, null, null);
statePerKey.put(key, revisionState);
// prepare revison event
revisionEvent.setLastBaseEvent(underlyingEvent);
revisionEvent.setKey(key);
revisionEvent.setHolders(null);
revisionEvent.setLatest(true);
// Insert into indexes for fast deletion, if there are any
for (EventTable table : indexRepository.getTables()) {
table.add(newData);
}
// post to data window
revisionState.setLastEvent(revisionEvent);
namedWindowRootView.updateChildren(new EventBean[] {revisionEvent}, null);
return;
}
// new version
long versionNumber = revisionState.incRevisionNumber();
// Previously-seen full event
if (isBaseEventType) {
revisionState.setHolders(null);
revisionState.setBaseEventUnderlying(underlyingEvent);
}
// Delta event to existing full event
else {
int groupNum = typesDesc.getGroup().getGroupNum();
RevisionBeanHolder[] holders = revisionState.getHolders();
if (holders
== null) // optimization - the full event sets it to null, deltas all get a new one
{
holders = new RevisionBeanHolder[groups.length];
} else {
holders = arrayCopy(holders); // preserve the last revisions
}
// add the new revision for a property group on top
holders[groupNum] =
new RevisionBeanHolder(
versionNumber, underlyingEvent, typesDesc.getChangesetPropertyGetters());
revisionState.setHolders(holders);
}
// prepare revision event
revisionEvent.setLastBaseEvent(revisionState.getBaseEventUnderlying());
revisionEvent.setHolders(revisionState.getHolders());
revisionEvent.setKey(key);
revisionEvent.setLatest(true);
// get prior event
RevisionEventBeanDeclared lastEvent = revisionState.getLastEvent();
lastEvent.setLatest(false);
// data to post
EventBean[] newDataPost = new EventBean[] {revisionEvent};
EventBean[] oldDataPost = new EventBean[] {lastEvent};
// update indexes
for (EventTable table : indexRepository.getTables()) {
table.remove(oldDataPost);
table.add(newDataPost);
}
// keep reference to last event
revisionState.setLastEvent(revisionEvent);
namedWindowRootView.updateChildren(newDataPost, oldDataPost);
}