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From "Shapira, Yoav" <>
Subject RE: How do I listen for threads starting and stopping?
Date Fri, 30 May 2003 17:06:54 GMT

Just be very careful with ThreadLocal -- it's inherently evil and easy
to misuse.

Consider the PooledExecutor from Doug Lea's util-concurrent package
(which will become java.util.concurrent in J2SE 1.5, Doug Lea's the spec
lead for JSR 166) as an alternative:

Yoav Shapira
Millennium ChemInformatics

>-----Original Message-----
>From: Kenneth H. Cox []
>Sent: Friday, May 30, 2003 1:00 PM
>To: Tomcat Users List
>Subject: Re: How do I listen for threads starting and stopping?
>Sorry; I was unclear.  I'm planning to use TclBlend to start one
>Tcl interpreter per thread (a Tcl interp cannot jump threads and
>so cannot be pooled).  Starting and initializing these interps is
>somewhat heavyweight, so my plan was to keep them around until
>Tomcat discards the thread or the thread dies of natural causes,
>at which point I would like to be notified, so I can free my interp
>(and the memory allocated by its native code).
>Unless (duh?) a ThreadLocal variable will do this for me.  Yes,
>it seems that it will.  Thanks for kicking my brain back into gear.
>p.s. Any other Tomcat / TclBlend users out there?  I'm hunting
>for a combination of JDK/TclBlend/Tcl/Thread that play together.
>On Wed, 28 May 2003 22:00:56 -0700, Bill Barker <>
>> The simplest (portable) way to do this is to pretend that Threads are
>> same as Requests, and use request.setAttribute("foo",bar).  These
>> automatically be discarded (i.e. eligible for GC) at the end of the
>> Request.
>> If you need to do explicit cleanup, then you have to wait for TC 5.x,
>> which
>> has RequestListeners to tell you when the Request starts and ends.
>> "Kenneth H. Cox" <> wrote in message
>>> I have some per-thread data that I need to dispose of
>>> when Tomcat connector thread goes away.  I'm using the
>>> Coyote Connector.  Is there a way to do it?  A Tomcat-specific
>>> mechanism is just fine for now, thank you.
>>> I found HttpConnector.addLifecycleListener(), but all the
>>> methods are marked deprecated and I'm not sure how to get at the
>>> HttpConnector in the first place.
>>> Any pointers in the right direction would be greatly appreciated.
>>> Regards,
>>> kenstir
>>> --
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