I have only just begun to examine the Mina code base and was hoping someone could validate the following assumptions for me.  What follows is a mini design followed by my assumptions.

Mini Design :

* What I want to acheive is a "MINA process" that accepts incoming client connections, and then "buffers" them ready for a completely separate process (eg outside the VM) which will ask for "any incoming requests".  The processing of requests and replies would be done in a asynch manner.

* For the record this "separate process" is a commercial message broker that talks other protocols but doesnt do native TCPIP sockets.  Hence the separation of TCPIP handling and the cross process communication.

* The "MINA process" would accept client requests without reading them or replying to them (timeout handling is assumed here of course) .  Rather the "MINA process" would "put the "ProtocolSession" aside in a memory table ready for later "reading and processing". (This might be tweaked to read the request first but certainly not write a reply then and there)

* The "outside process" would ask for "work" from ther MINA process at its leisure, at which time the "MINA process" would "read" the data from the "stored ProtocolSession" and pass that over to the "outside process". 

* Once the "outside process" had finished working on the "data" it would "pass a reply back" to the "MINA process" and have the MINA process "write" the reply data down the "stored" ProtocolSession.


* The ProtocolSession objects can be "stored" for later use and do not have to read from nor written to immediately.  Rather they can be "set aside" and read from at some later asynch event (inside a timeout periods of course)

*  The use of 2 ThreadPoolFilters (the IO one and the Protocol one) will enabled a level of "asynchronisity" to allow for "asynch" servicing of requests.

* The "MINA" process can "listen" on more than 1 port at a time (one for client request communication and one for "MINA process to outside process" communication)

* Arbitary "periods" can occur between accepting/reading and writing to the Session objects.

Second Mini Design

* The MINA process could do the same sort thing as above but acting as a client instead of a server.  eg the "outside prcocess" could ask for a client connection to be made to some other system.  The MINA process would "call out" as a client and then "store" the outbound Session somewhere.

* Multiple outbound "client calls" could be made with one or more "selector" threads looking for potential replies, never waiting long for any given reply.  if it gets a reply message, it would read the data and store it.

* The "outside process" would periodically ask for "replies" (using a magic key assigned earlier) in which case any replies found with that key would be returned.


* MINA can do client style connections as well as server style connections

* MINA code can have multiple outstanding "client connections" with a "selector" thread that can "tell" when they have become readable?

* Multiple SocketConnectors would be the way to do this?

Brad Baker