private boolean invokeExistingSagas(
EventProxy<?> event,
Class<? extends Saga> sagaType,
Collection<AssociationValue> associationValues) {
Set<String> sagas = new TreeSet<>();
for (AssociationValue associationValue : associationValues) {
sagas.addAll(sagaRepository.find(sagaType, associationValue));
}
for (Saga sagaInCreation : sagasInCreation.values()) {
if (sagaType.isInstance(sagaInCreation)
&& containsAny(sagaInCreation.getAssociationValues(), associationValues)) {
sagas.add(sagaInCreation.getSagaIdentifier());
}
}
boolean sagaOfTypeInvoked = false;
for (final String sagaId : sagas) {
if (synchronizeSagaAccess) {
lock.obtainLock(sagaId);
Saga invokedSaga = null;
try {
invokedSaga = loadAndInvoke(event, sagaId, associationValues);
if (invokedSaga != null) {
sagaOfTypeInvoked = true;
}
} finally {
doReleaseLock(sagaId, invokedSaga);
}
} else {
loadAndInvoke(event, sagaId, associationValues);
}
}
return sagaOfTypeInvoked;
}
private void startNewSaga(
EventProxy<?> event, Class<? extends Saga> sagaType, AssociationValue associationValue) {
Saga newSaga = sagaFactory.createSaga(sagaType);
newSaga.getAssociationValues().add(associationValue);
preProcessSaga(newSaga);
sagasInCreation.put(newSaga.getSagaIdentifier(), newSaga);
try {
if (synchronizeSagaAccess) {
lock.obtainLock(newSaga.getSagaIdentifier());
try {
doInvokeSaga(event, newSaga);
} finally {
try {
sagaRepository.add(newSaga);
} finally {
doReleaseLock(newSaga.getSagaIdentifier(), newSaga);
}
}
} else {
try {
doInvokeSaga(event, newSaga);
} finally {
sagaRepository.add(newSaga);
}
}
} finally {
removeEntry(newSaga.getSagaIdentifier(), sagasInCreation);
}
}
private void doReleaseLock(final String sagaId, final Saga sagaInstance) {
if (sagaInstance == null || !CurrentUnitOfWork.isStarted()) {
lock.releaseLock(sagaId);
} else if (CurrentUnitOfWork.isStarted()) {
CurrentUnitOfWork.get()
.registerListener(
new UnitOfWorkListenerAdapter() {
@Override
public void onCleanup(UnitOfWork unitOfWork) {
// a reference to the saga is maintained to prevent it from GC until after the UoW
// commit
lock.releaseLock(sagaInstance.getSagaIdentifier());
}
});
}
}
