public  void add() throws Exception 
{
      // Empty
}

Add a instance in the pool

 protected EnterpriseContext create(Object instance) throws Exception 
{
      // The instance is created by the caller and is a newInstance();
      return new StatelessSessionEnterpriseContext(instance, getContainer());
}

 public synchronized  void discard(EnterpriseContext ctx) 
{
      // Throw away
      try
      {
         ctx.discard();
      } catch (RemoteException e)
      {
         // DEBUG Logger.exception(e);
      }
      // Notify waiters
      inUse = false;
      this.notifyAll();
}

 public synchronized  void free(EnterpriseContext ctx) 
{
      // Notify waiters
      inUse = false;
      this.notifyAll();
}

Return an instance after invocation. Called in 2 cases: a) Done with finder method b) Just removed

 public synchronized EnterpriseContext get() throws Exception 
{
   // Static --------------------------------------------------------
   // Constructors --------------------------------------------------
   // Public --------------------------------------------------------
      // Wait while someone else is using it
      while(inUse && isSynchronized)
      {
         try { this.wait(); } catch (InterruptedException e) {}
      }
      // Create if not already created (or it has been discarded)
      if (ctx == null)
      {
         try
         {
            ctx = create(getContainer().createBeanClassInstance());
         } catch (InstantiationException e)
         {
            throw new EJBException("Could not instantiate bean", e);
         } catch (IllegalAccessException e)
         {
            throw new EJBException("Could not instantiate bean", e);
         }
      }
      else
      {
      }
      // Lock and return instance
      inUse = true;
      return ctx;
}

Get the singleton instance

 public long getAvailableCount() 
{
      return 1;
}

 public int getCurrentSize() 
{
      return 1;
}

 public int getMaxSize() 
{
      return 1;
}

 public  void importXml(Element element) throws DeploymentException 
{
      Element synch = MetaData.getUniqueChild(element, "Synchronized");
      isSynchronized = Boolean.valueOf(MetaData.getElementContent(synch)).booleanValue();
}