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From "Carsten Ziegeler (JIRA)" <>
Subject [jira] Commented: (COCOON-2071) Option to turn off pooling for components (probably faster on new JVMs and simpler debugging)
Date Fri, 01 Jun 2007 05:56:15 GMT


Carsten Ziegeler commented on COCOON-2071:

I like the idea, but there is an issue with your patch: the current pooling implementation
does actually two things, a) pooling (obviously) and b) it allows to use pooled components
inside thread safe components by using the proxy. The proxy ensures that each thread gets
a different component for the pooled component. Without this proxy all threads share the same
instance which will not work. (Btw, this is no issue for sitemap components as they are looked
up on demand). So we need this proxy.
I think it would be great if I could turn on/off pooling on a per component base (just for
fine-tuning), too. Additing an additional attribute to the configuration and evaluating it
should be fairly easy.


> Option to turn off pooling for components (probably faster on new JVMs and simpler debugging)
> ---------------------------------------------------------------------------------------------
>                 Key: COCOON-2071
>                 URL:
>             Project: Cocoon
>          Issue Type: Test
>          Components: - Components: Sitemap
>    Affects Versions: 2.2-dev (Current SVN)
>            Reporter: Alexander Klimetschek
>            Assignee: Carsten Ziegeler
>            Priority: Minor
>         Attachments: disable-pooling-config.patch
> This is a patch that makes the pooling of components/beans optional: by setting this
in the applicationContext.xml
>   <!-- Activate Avalon Bridge -->
>   <avalon:bridge pooling="false"/>
> it is possible to turn off pooling completely. The idea is to start testing performance
differences between pooling and non-pooling. The default value for the "pooling" option is
true, so existing configurations without the attribute set will behave as before when this
patch is applied.
> Pooling was introduced back then when creating a new object in Java was slow and re-using
of existing objects was faster. Since Java 1.4 this is no longer the case, creating new objects
is said to be even faster than malloc() in C. Because pooling needs a recycle() method (to
reset internal stuff before reuse) and more calls, including some AOP and Proxy class stuff
to add pooling, it is worth to check what is faster nowadays.
> One thing that always annoys me during debugging is that the AOP stuff adds like 4-5
additional calls when accessing a pooled component in the stacktrace - code that you cannot
step into, because it has no java source. Removing pooling completely would make the Cocoon
architecture (especially the runtime architecture) much simpler.
> My idea is that Cocoon users can test the performance difference on their various systems
to get actual results. WDYT?

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