Rodrigo Madera wrote:
Hello there,
I wish to know if there is some kind of protocol selector class based on
session state.
As strange as I make it sound, it's a simple concept once I can state it
right, so let me try to make it clear by using an example:
Imagine a protocol where one 3CPO robot talks to another 3CPO robot (that
golden robot from Star Wars that talks a lot).
Since he can talk in N different dialects (or languages, mind SW fans here),
imagine that it's protocol can be different based on the current dialect
they are using.
To make things even more strange (and complicated), let's say that they use
yet a different protocol even to handshake.
Once they settle on a given dialect, that dialect corresponds to it's own
protocol, having it's own messages and thus it's own family of encoders and
decoders.
So wrapping up, we have a protocol which:
1) Is actually a collection of different protocols.
2) Can switch to any other underlying protocol at any time.
In theory, what I'm looking for is something that I would implement, given
my knowledge at the time, like this:
SuperProtocol
encode(...):
switch session.currentProtocol {
HANDSHAKING: HANDSHAKING.encode/decode(...)
KLINGON: KLINGON.encode/decode(...)
DAFFYLISH: DAFFYLISH.encode/decode(...)
I hope that I got the message right, since this is kind of hard for me to
explain. I guess this is not so common on the protocol landscape since a
message format is adhered to. But there are sometimes where there is really
the need to completely switch the protocol being used.
You already can switch the protocol live during a session. Just get the
current session chain, remove the previous protocolCodec, and inject the
new protocolCodec.
That should do the trick (except that it won't understand D2R2 language,
because the protocol is unkown ... :)
--
--
cordialement, regards,
Emmanuel Lécharny
www.iktek.com
directory.apache.org
