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From: "Bill Barker" <wbarker@wilshire.com>
To: "Tomcat Developers List" <dev@tomcat.apache.org>
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Subject: Re: Rewrite features
Date: Thu, 3 Nov 2005 12:38:54 -0800
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----- Original Message -----
From: "Remy Maucherat" <remm@apache.org>
To: "Tomcat Developers List" <dev@tomcat.apache.org>
Sent: Thursday, November 03, 2005 12:11 PM
Subject: Re: Rewrite features


>Costin Manolache wrote:
>> On 11/3/05, Bill Barker <wbarker@wilshire.com> wrote:
>>
>>>It probably doesn't matter (since nobody uses it :), but using
ThreadLocal
>>>won't work with the Nio/AJP Connector.  That one doesn't bind a Request
>>>instance to a Thread instance, so a particular Request instance will
process
>>>on many different Threads during its lifecycle.
>>
>> Does the spec say anything about the thread model when executing a
>> servlet ? ( too lazy to search, I know some people on the list have
>> memorized the spec already :-)
>>
>> I'm not sure how this happens - I tought that the request is bound to
>> a thread during service() execution, and kept-alive connections are no
>> longer bound. How do we unbind the service() from the thread ???
>
>There must be a misunderstanding somewhere: the thread is indeed bound
>during the execution of the adapter process method, so TLs should work
>the way I am using them. Using notes is difficult for this because there
>can be "nested" rewrites (one at host level + one at context level, for
>example). I would have preffered using that for performance, of course;
>maybe an array would do it, or something, but TLs are cleaner to
>understand. I do need plenty of TLs anyway, as the regexp engine is per
>thread. For some reason, it took me a long time to figure out a design
>that I liked, worked and met the requirements (I suck).
>

The TomcatResolver instance is holding a reference to the Request instance,
and is in a TL.  As a result (because of the way the ThreadPool works) it
will live very much longer than just during the processing of a given
Request.  This is all fine for all of the current Connectors except Nio/AJP,
since they happen to bind the Request instance to the Thread instance so you
always get the right Request instance.

Adding a setRequest method to TomcatResolver would "fix" this with the
minimal amount of work.


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