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From "Karl Pauls (JIRA)" <j...@apache.org>
Subject [jira] Commented: (FELIX-314) EventDispatcher class not reusable in same class loader for multiple Felix instances
Date Thu, 28 Jun 2007 21:21:04 GMT

    [ https://issues.apache.org/jira/browse/FELIX-314?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12508935
] 

Karl Pauls commented on FELIX-314:
----------------------------------

I'd like to stress how important it is to keep the number of framework created threads to
a minimum. I have use cases where I need lots of frameworks and operating systems have thread
limits which are often hard to change. Additionally, threads are cumbersome in resource restricted
environments (and I'm using Felix there too). 

Furthermore, it looks to me like it should be enough to keep some kind of reference count
of active frameworks in the EventDispatcher to make it work with a single thread, no?

> EventDispatcher class not reusable in same class loader for multiple Felix instances
> ------------------------------------------------------------------------------------
>
>                 Key: FELIX-314
>                 URL: https://issues.apache.org/jira/browse/FELIX-314
>             Project: Felix
>          Issue Type: Bug
>          Components: Framework
>    Affects Versions: 0.8.0
>            Reporter: Felix Meschberger
>             Fix For: 1.0.0
>
>         Attachments: FELIX-314.diff
>
>
> Consider this use case:
>    Felix felix = new Felix();
>    felix.start(props, null);
>    felix.shutdown();
>    felix = new Felix();
>    felix.start(props, null);
>    felix.shutdown();
> The first Felix instance will stop the EventDispatcher by calling the static EventDispatcher.shutdown()
method thus stopping the event dispatcher thread and setting the static variables stopping
and stopped to true. The reference to the event dispatcher thread in the static variable m_thread
is not cleared on shutdown.
> The second Felix instance will create an EventDispatcher instance but the static fields
are not reset. That is the event dispatcher is assumed to be stopped and the event dispatcher
thread will not be newly created and started.
> I will suggest a patch for this issue.

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