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Subject: RE: How do I listen for threads starting and stopping?
Date: Fri, 30 May 2003 13:06:54 -0400
Message-ID: <9C5166762F311146951505C6790A9CF8A6E5A2@US-VS1.corp.mpi.com>
Thread-Topic: How do I listen for threads starting and stopping?
Thread-Index: AcMmzQ5vUYRhZ9O7QFqMO35nyI16kgAAJrRg
From: "Shapira, Yoav" <Yoav.Shapira@mpi.com>
To: "Tomcat Users List" <tomcat-user@jakarta.apache.org>


Howdy,
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 sp=
ec
lead for JSR 166) as an alternative:
http://gee.cs.oswego.edu/dl/classes/EDU/oswego/cs/dl/util/concurrent/i=
nt
ro.html

Yoav Shapira
Millennium ChemInformatics


>-----Original Message-----
>From: Kenneth H. Cox [mailto:tclunit@attbi.com]
>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.
>
>Ken
>
>
>On Wed, 28 May 2003 22:00:56 -0700, Bill Barker <wbarker@wilshire.com=
>
>wrote:
>
>> The simplest (portable) way to do this is to pretend that Threads a=
re
the
>> same as Requests, and use request.setAttribute("foo",bar).  These
will
>> 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" <tclunit@attbi.com> wrote in message
>> news:oprpwig1cl3ocmvz@mail.attbi.com...
>>> 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
>>>
>>> --
>>> Using M2, Opera's revolutionary e-mail client:
http://www.opera.com/m2/
>>
>>
>>
>>
>> -------------------------------------------------------------------=
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>
>
>
>--
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