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Date: Sun, 27 Nov 2005 20:25:57 +0100 (CET)
From: "Matteo Merli (JIRA)" <jira@apache.org>
To: dev@directory.apache.org
Subject: [jira] Commented: (DIRMINA-51) Object serialization filter
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    [ http://issues.apache.org/jira/browse/DIRMINA-51?page=comments#action_12358576 ] 

Matteo Merli commented on DIRMINA-51:
-------------------------------------

I reworked on the filter to resolve the issue with the stream being splitted in multiple packets. I'm dealing with the two different cases of TCP and UDP.

TCP is working fine. I've added a 4 bytes int containing the overall stream length at the beginning. Then the object is de-serialized when the entire-stream is received. The partial buffer is saved as an attribute session.

UDP is more difficult. I've implemented a packet fragmentation method that splits the stream and send every packet with attached sequence number.
The receiver will get the UDP packets in no particular order and can reconstruct the stream using the sequence number.
Problems arise because I can't save the received packets as a session attribute. Every time messageReceived() is called on the filter, the session object is different. 

I thinked to use a message Id attached to every packet, and store them temporarely into a static Map instead of session. But then a new problem comes up: using session, all the saved data is cleared when a timeout event is fired. Using a static map, lost packets will remain there forever..

Any thoughs?
Is Udp support important or can it be droppen? I believe it's important, at least for a completeness point of view..


> Object serialization filter
> ---------------------------
>
>          Key: DIRMINA-51
>          URL: http://issues.apache.org/jira/browse/DIRMINA-51
>      Project: Directory MINA
>         Type: New Feature
>     Reporter: Trustin Lee
>     Assignee: Trustin Lee
>      Fix For: 0.9.1
>  Attachments: SerializationFilter.java, TestSerialization.zip
>
> Users with no time to implement PDUs will be able to get a lot of benefit from this filter to test their protocol logic implementation.

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