code: public synchronized void onCloseSession(ExtendedSession session)
     {
        this.cache.remove(key((ManageableRepository)session.getRepository(), session.getWorkspace().getName()));
     }
docs: /*
  (non-Javadoc)
  @see
  org.exoplatform.services.jcr.core.SessionLifecycleListener#onCloseSession(org.exoplatform.services
  .jcr.core.ExtendedSession)