[JAMES-750] Refactor AbstractJamesHandler and SMTPHandler/Handlerapi to be line-push-based (isolate IO layer)

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.0.0
• Component/s: James Core, SMTPServer
• Assignee: Norman Maurer
• Reporter: Stefano Bagnara
• Created: 24/Dec/06 16:12
• Updated: 12/Oct/09 18:24
• Resolved: 12/Oct/09 18:24

Description

From past discussions we decided that we are not ready to switch to MINA right now, but we want handlerapi-v2 to be easily ported to MINA and other asynchronous IO frameworks.

Not everyone agreed switching to MINA-only (and require java5 for SSL usage) and Noel made a strawman implementation of a push based/line based processor.

This is my attempt to bring this thing to James.

This is only a first hack to make it working because DataCmdHandler will need almost a full rewrite. Now I used CRLFDelimitedByteBuffer from Noel and I updated the main code to introduce a lineHandlers stack and a LineHandler interface (LineHandler is my name for Noel IOHandler, I preferred to use LineHandler to avoid reusing a mina name with a different behaviour and avoid confusion).

SMTPServerTest pass, but a lot of code have to be fixed/improved in order to apply this to trunk.