quackingduck-archive / message-ports Goto Github PK

Thanks to @rstuven for pointing this out in #1.

Currently, this code

pull  = mp.pull 3000
push1 = mp.push 3000
push2 = mp.push 3000

Will cause the the pull socket to bind to port 3000 and the push sockets to connect to port 3000. The pull socket will buffer incoming messages and then process them fairly - i.e. one from push1 then one from push2 then one from push1 etc. This strategy of processing messages from the incoming buffer is called fair queuing.

ZeroMQ also allows the opposite configuration. Where the the push sockets bind and the pull socket connects. Messages will still flow in the same direction (form push to pull) but in this case the push sockets buffer their outgoing messages and the pull socket asks for them in a fair manner - i.e. it asks push1 for a message then it asks push2 then it asks push1 etc. This strategy of asking for messages fairly goes by round robin.

I think having the pull socket bind should remain the default but explicitly specifying whether you want the socket to bind/connect should be possible with:

# default behavior
pull  = mp.pull.bind 3000
push1 = mp.push.connect 3000
push2 = mp.push.connect 3000

# reversed
pull  = mp.pull.connect 3000, 3001
push1 = mp.push.bind 3000
push2 = mp.push.bind 3001

The same goes for request/reply sockets.