Hi,
Extract the locking managing code in a service.
Then use Spring/CDI/Guice/... to manage the service dependencies for you.
Martin Grigorov
Wicket Training and Consulting
On Mon, Feb 3, 2014 at 2:38 PM, ChambreNoire <a...@tentelemed.com> wrote:
> 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;
> }
>
>
> --
> View this message in context:
> http://apache-wicket.1842946.n4.nabble.com/Accessing-WebApplication-from-the-service-layer-tp4664145.html
> Sent from the Users forum mailing list archive at Nabble.com.
>
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