Hello,

I'm currently thinking of implementing a IMAP Client module in pike, which will further in line be integrated in a roxen module. I have looked through several client module implementations, and also into Protocols.Line.imap_style.

I'm now trying to decide between whether it is smart to use callbacks internally or not. I've come up with a short list of pros and cons, and was wondering some of the more hardened developers could shed some light on the issue.

Pro's * The IMAP protocol per default sends out-of-band data (meaning data which was not requested by the client). This data needs to be handled. In a webenvirenmont the actual client can not easily be notified, but the client module needs to have this ready at least on a reload. Using callbacks the data can be handled module internally. * The module could use the new IMAP IDLE support which updates the selected mailbox out-of-band so reducing the need for polling.

Con's * The client needs to at least start the callback backend. If it doesn't the module will never work * Synchronisation. If a client wants to select a different mailbox, the pagereload needs to block until the server reports back with mailbox data.

Thanks for considering this,

Marc