Hey,
I've just been sketching out an entity locking mechanism (below) to prevent
users from editing entities which another user is already in the process of
editing. It works fine but the problem is that placing this in my
WebApplication class means that I need to make MyApplication.get() call from
within my service layer and this seems a tad messy. Is this a Wicket
cardinal sin or am I just stressing over nothing?
Cheers,
Chambre
class EntityLock {
public String entityId;
public String entityName;
public String sessionId;
public Date locked;
public Date lastBumped;
}
@SuppressWarnings("unchecked")
private Map<String, EntityLock> getEntityLocksByEntity() {
HashMap<String, EntityLock> locksByEntity = (HashMap<String,
EntityLock>) getMetaData(ENTITY_LOCKS_BY_ENTITY);
if (locksByEntity == null) {
locksByEntity = new HashMap<String, EntityLock>();
setMetaData(ENTITY_LOCKS_BY_ENTITY, locksByEntity);
}
return locksByEntity;
}
public boolean acquireEntityLock(PersistentEntity entity) {
EntityLock lock = getEntityLocksByEntity().get(entity.getId());
if (lock != null) {
if ((System.currentTimeMillis() - lock.lastBumped.getTime()) >
(1 * 60 * 1000)) {
releaseEntityLock(entity);
} else {
return false;
}
}
getEntityLocksByEntity().put(entity.getId(), newEntityLock(entity));
return true;
}
private EntityLock newEntityLock(PersistentEntity entity) {
EntityLock newLock = new EntityLock();
newLock.entityId = entity.getId();
if (entity instanceof HibernateProxy) {
newLock.entityName = ((HibernateProxy)
entity).getHibernateLazyInitializer().getEntityName();
} else {
newLock.entityName = entity.getClass().getName();
}
newLock.sessionId = getSession().getId();
Date now = new Date();
newLock.locked = now;
newLock.lastBumped = now;
return newLock;
}
public void releaseEntityLock(PersistentEntity entity) {
getEntityLocksByEntity().remove(entity.getId());
}
public boolean isEntityLocked(PersistentEntity entity) {
return getEntityLocksByEntity().get(entity.getId()) != null;
}
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