March 2013
Intermediate to advanced
516 pages
15h 11m
English
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The DEALER to REP Combination
Now, let’s replace the REQ client with a DEALER. This gives us an asynchronous client that can talk to multiple REP servers. If we rewrote our “Hello World” client using DEALER, we’d be able to send off any number of “Hello” requests without waiting for replies.
When we use a DEALER to talk to a REP socket, we must accurately emulate the envelope that the REQ socket would have sent, or the REP socket will discard the message as invalid. So, to send a message, we:
Send an empty message frame with the
MOREflag set.Send the message body.
And when we receive a message, we:
Receive the first frame and, if it’s not empty, discard the whole message.
Receive the next frame and pass that to the application.
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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