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https://issues.apache.org/jira/browse/PROTOCOLS-11?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12933341#action_12933341
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Stefano Bagnara commented on PROTOCOLS-11:
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We made this way to make it simpler to write CommandHandler. The simplicity
could not be ported to Connect/LIne handler because they are more powerful, but
the CommandHandler pattern is simpler to implement correctly: implementors are
"forced" by the interface to do the right thing. In SMTP/POP3 there are no
commands that do not return, and they always returns one result in response to
one command.
> Make CommandHandler/LineHandler/ConnectHandler more consistent
> --------------------------------------------------------------
>
> Key: PROTOCOLS-11
> URL: https://issues.apache.org/jira/browse/PROTOCOLS-11
> Project: JAMES Protocols
> Issue Type: Task
> Affects Versions: 1.0, 1.1
> Reporter: Norman Maurer
> Assignee: Norman Maurer
> Fix For: 1.2-M2
>
>
> At the moment we have three different Handler types. These are
> ConnectHandler, CommandHandler and LineHandler. The ConnectHandler and
> LineHandler use void as return type and so if you want to write something
> back to the client you use Session.write(...). On the other hand if you use
> CommandHandler you can use the return type of Response to trigger a write
> back to the client and Session.write(..). We should only use
> Session.write(...) in all cases
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