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List:       james-user
Subject:    Re: Concurrency in Mailets?
From:       Bosco So <bosco_groundspring () despammed ! com>
Date:       2003-07-29 17:13:57
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If the mailet life cycle like the servlet life cycle where there's only 
one instance of a mailet in the system (and the service method is 
entered by multiple threads)? If so, then not only do your class 
variables appear only once, but also your instance variables - multiple 
threads can step all over the same instance variables. This bug is hard 
to detect because you won't encounter it until you start getting lots of 
traffic.

>I'm curious about the following: is it possible that the instance of a
>mailet (or matcher) is executed more than once concurrently? This would
>have impact on the design of a custom mailet (using class fields, for
>example, could lead to problems), but I can't find anywhere whether this
>can occur or not.
>


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