public boolean beforeInsert(ObjectRepresentation objectRepresentation) {
String className = objectRepresentation.getObjectClassName();
// The mutex is used to avoid concurrent access for this operation
Mutex mutex = MutexFactory.get("SEQUENCE_MUTEX_[" + className + "]");
System.out.print("SequenceTrigger called by " + className);
OID oid = objectRepresentation.getOid();
if (oid != null) {
System.out.print(" (" + oid.oidToString() + ") ");
} else {
System.out.print(" (No OID) ");
}
try {
Long existingId = null;
try {
existingId = (Long) objectRepresentation.getValueOf("id");
} catch (Exception e) {
e.printStackTrace();
System.out.print(" which failed the objectRepresentation.getValueOf('id');");
return false;
}
if (existingId == null) {
// Acquire the trigger
mutex.acquire("SEQUENCE_TRIGGER_[" + className + "]");
long id = getNextId(className);
// Sets the value on the user object
objectRepresentation.setValueOf("id", new Long(id));
System.out.println(" which got the ID " + id);
return true;
} else {
System.out.println(" which already got the ID " + existingId);
}
} catch (Exception e) {
e.printStackTrace();
throw new RuntimeException("Error in SequenceTrigger. Code should be improved.", e);
} finally {
// Release the mutex
if (mutex != null && mutex.isInUse()) {
mutex.release("SEQUENCE_TRIGGER_[" + className + "]");
}
}
return false;
}
