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From "dave irving (JIRA)" <j...@apache.org>
Subject [jira] Created: (DIRMINA-218) Ability to transfer channels to socket channels owned by Mina
Date Fri, 02 Jun 2006 08:19:29 GMT
Ability to transfer channels to socket channels owned by Mina
-------------------------------------------------------------

         Key: DIRMINA-218
         URL: http://issues.apache.org/jira/browse/DIRMINA-218
     Project: Directory MINA
        Type: New Feature

    Versions: 0.9.5    
    Reporter: dave irving
    Priority: Minor


Id like to be able to transfer file contents to a socket as effeciently as possible.
In some cases, making use of FileChannel#transferTo(long, long, WritableByteChannel) is a
good choice, as it (in theory) allows the OS to do the transfer without bringing the file
content in to user space (e.g. could make use of sendfile behind the scenes or whatever).

There is no direct way to obtain the channel from an IOSession - but even if there was - allowing
a user to do this directly is dangerous as Mina could have queued writes pending for the channel.

This JIRA issue can hopefully kick off some discussion.
I see two basic ways to do this:

1) Add "sendFile(FileChannel)" or similar to IoSession. Mina then queues this request along
with other pending writes. Of course, mina must take care of potentially several invocations
to FileChannel#transferTo - as all bytes might not be transfered in one go.

2) Allow the user to schedule their own channel commands. For example, a "write command" scheduled
by the user would be invoked by mina when the write queue was free. 

Im not sure that option 2 is really needed - and could be quite complex, so my preference
is (1).

If we can get agreement on approach, I'll start on a patch.

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