private Lock createLock(Lockable l) {
Lock lock = new Lock();
String className = l.getClass().getCanonicalName();
try {
className = Hibernate.getClass(l).getCanonicalName();
} catch (HibernateException h) {
log.error("Hibernate getClass() ", h);
}
// log.debug( "Example log: "+l.getLockname()+" "+l.getClass().getCanonicalName()+"->"+className
// );
lock.setObjectId(l.getDbID());
lock.setObjectType(className);
lock.setName(l.getLockname());
return lock;
}
/**
* Aquire lock for given item or check that you still have it. This should be done before database
* objects are updated, not just before they are made persistent. It should not be done (Cannot be
* done) with objects that don't have a dbID yet.
*
* @param u
* @param sessionId
* @param item
* @return
*/
public boolean aquireLock(User u, String sessionId, Lockable item) {
boolean result = false;
StatelessSession s = getSession();
Transaction tx = s.beginTransaction();
if ((item == null) || (item.getDbID() == null)) throw new Error("Unlockable item");
try {
Lock lock = createLock(item);
lock.setUserLogin(u.getLogin());
lock.setHttpSessionId(sessionId);
log.debug("Aquire Lock\n" + lock.toString());
List<Lock> l =
s.createQuery("from Lock where objectId = :id and objectType = :type")
.setLong("id", lock.getObjectId())
.setString("type", lock.getObjectType())
.list();
if (l.size() == 0) {
s.insert(lock);
tx.commit();
result = true;
} else {
Lock lock2 = l.get(0);
if (lock2.getUserLogin().equals(lock.getUserLogin())
&& lock2.getHttpSessionId().equals(lock.getHttpSessionId())) result = true;
else result = false;
tx.commit();
}
} catch (HibernateException he) {
log.debug("lock aquire failed");
StringWriter sw = new StringWriter();
he.printStackTrace(new PrintWriter(sw));
log.error(sw.toString());
tx.rollback();
}
return result;
}