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https://issues.apache.org/jira/browse/DIRMINA-447?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12531139
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Maarten Bosteels commented on DIRMINA-447:
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related discussion on the mailing-list:
http://www.nabble.com/Adding-more-than-one-filter-of-the-same-type.-tf3644119s16868.html#a10177107
> Allow adding more than one IoFilters of the same type.
> ------------------------------------------------------
>
> Key: DIRMINA-447
> URL: https://issues.apache.org/jira/browse/DIRMINA-447
> Project: MINA
> Issue Type: Improvement
> Components: Core, Filter
> Reporter: Trustin Lee
> Fix For: 2.0.0-M1
>
>
> Currently, many existing filters such as ProtocolCodecFilter can't be added
> more than once to the same filter chain. It is because filters usually store
> its state information as a session attribute; adding more than one filters of
> the same type will mess their internal state.
> Therefore, users can't do something more complex like multi-layered protocol
> implementation.
> To resolve this issue, all filter implementations must create its session
> attribute key dynamically, instead of using a static key.
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