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From Henri Yandell <bay...@generationjava.com>
Subject Re: [POOL] Pool listeners
Date Fri, 28 Feb 2003 20:00:44 GMT

Also a PoolAdaptor.

On Fri, 28 Feb 2003, David Graham wrote:

> I would make PoolListener more closely match the Java listener style.  That
> is:
> 1. PoolListener extends java.util.EventListener
>
> 2. The methods accept an event object that extends java.util.EventObject
> (maybe call it PoolEvent).
>
> 3. The methods shouldn't throw Exception.  They should throw specific
> exception types or non at all.
>
> I like the concept.
>
> David
>
>
>
>
> >From: "Quinton McCombs" <qmccombs@nequalsone.com>
> >Reply-To: "Jakarta Commons Developers List"
> ><commons-dev@jakarta.apache.org>
> >To: <commons-dev@jakarta.apache.org>
> >Subject: [POOL] Pool listeners
> >Date: Fri, 28 Feb 2003 13:19:48 -0600
> >
> >I am working on a patch to allow listeners to be added to pools that
> >will receive notifications on various events.  Does anyone object to
> >having this functionality included?
> >
> >Here is the design -
> >
> >I was thinking about adding support for a PoolListener interface for the
> >pool component.  Object which implement this interface could be added to
> >any ObjectPool or KeyedObjectPool.  The listener would be notified on
> >the following events:
> >
> >- An object is borrowed from the pool
> >- An object is returned to the pool
> >- An new object is created and added to the pool
> >- An object is removed from the pool
> >
> >addListener(PoolListener) would be defined in ObjectPool and
> >KeyedObjectPool.  It would be implemented in BaseObjectPool and
> >BaseKeyedObjectPool.  Also in the previous two Base* classes, protected
> >methods would be added to handle sending out the notifications to the
> >list of listeners.
> >
> >public interface PoolListener
> >{
> >     /**
> >      * Executed immediatedly before an object is returned from the pool.
> >      *
> >      * @param obj The object being returned
> >      * @throws Exception generic exception
> >      */
> >     void onBorrow(Object obj) throws Exception;
> >
> >     /**
> >      * Executed immediately after an object is returned to the pool.
> >      *
> >      * @param obj the object being returned
> >      * @throws Exception generic exception
> >      */
> >     void onReturn(Object obj) throws Exception;
> >
> >     /**
> >      * Executed immediately after a new object is created but before it
> >      * is added to the pool.
> >      *
> >      * @param obj  the newly created object
> >      * @throws Exception generic exception
> >      */
> >     void onCreate(Object obj) throws Exception;
> >
> >     /**
> >      * Executed when an object is removed from the pool.
> >      *
> >      * @param obj The object being removed.
> >      * @throws Exception generic exception
> >      */
> >     void onDestroy(Object obj) throws Exception;
> >
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>
>
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