Pool interface question

[Stephen McConnell <mc...@osm.net>]

Concerning the interface org.apache.avalon.excalibur.mpool.Pool.

  1. I acquire an object
  2. I get instance A
  3. I acquire another object B
  4. if A == B, and I have not released A, I presume that this 
     would constitute an illegal state

Can anyone confirm this?

Steve.

Stephen J. McConnell, OSM sarl
digital products for a global economy
http://www.osm.net
mailto:mcconnell@osm.net 

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RE: Pool interface question

[Leo Sutic <le...@inspireinfrastructure.com>]

> From: Stephen McConnell [mailto:mcconnell@osm.net]
>
> Concerning the interface org.apache.avalon.excalibur.mpool.Pool.
>
>   1. I acquire an object
>   2. I get instance A
>   3. I acquire another object B
>   4. if A == B, and I have not released A, I presume that this
>      would constitute an illegal state
>
> Can anyone confirm this?

Yes. Pooled components are not used by more than one client at a time,
and it should be possible to grab two of them.

For example:

interface MyPooledComponent {

  /**
   * Call this one just as you obtain the component.
   */
  public void A ();

  /**
   * Must be called after A.
   */
  public void B ();

  /**
   * Must be called after B.
   */
  public void C ();
}

(In Cocoon, MyPooledComponent -> Transformer, MyPooledComponent.A ->
Transformer.setup,
so this is a real-life use case. One should be able to grab two transformers
to
create a pipeline.)

/LS


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