[ http://issues.apache.org/jira/browse/DIRMINA-185?page=all ]
peter royal resolved DIRMINA-185:
---------------------------------
Fix Version: 0.9.4
Resolution: Fixed
LCM has been refactored.
> Refactor IoFilter life cycle management
> ---------------------------------------
>
> Key: DIRMINA-185
> URL: http://issues.apache.org/jira/browse/DIRMINA-185
> Project: Directory MINA
> Type: Improvement
> Reporter: Niklas Therning
> Priority: Minor
> Fix For: 0.9.4
>
> I thought it would be good to have this discussion in JIRA. Please add your
> thoughs to this issue. Below I'll try to give a background to the problem.
> Recently, a discussion on IoFilter life cycle management has been going on on
> the MINA mailing list. Questions have been raised whether MINA should provide
> life cycle management (LCM) for all filters (the current situation), if it
> should be optional (either on by default or off by default) or if it
> shouldn't be supported at all.
> In version 0.9.2 of MINA IoFilter has six LCM methods:
> init, onPreAdd, onPostAdd, onPreRemove, onPostRemove and destroy
> The LCM is handled by AbstractIoFilterChain and the singleton
> IoFilterLifeCycleManager. IoFilterLifeCycleManager uses reference counting to
> determine whether init/destroy should be called when a filter is added
> to/removed from a filter chain.
> In MINA 0.8 filter chains were typically shared among sessions. This meant
> that init/destroy would only be called once (or at least very few times) in
> the lifetime of an application. However, in MINA 0.9 filter chains are always
> per session which means that in some circumstances init/destroy will be
> called very frequently.
> The discussion on LCM forked from the discussion on DIRMINA-169. The LCM
> described above causes a deadlock in the current implementation of
> ThreadPoolFilter.
> How do you think MINA should handle LCM?
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