Chapter 2. Sockets and Patterns
In Chapter 1 we took ÃMQ for a drive, with some basic examples of the main ÃMQ patterns: request-reply, publish-subscribe, and pipeline. In this chapter, weâre going to get our hands dirty and start to learn how to use these tools in real programs.
Weâll cover:
How to create and work with ÃMQ sockets
How to send and receive messages on sockets
How to build your apps around ÃMQâs asynchronous I/O model
How to handle multiple sockets in one thread
How to handle fatal and nonfatal errors properly
How to handle interrupt signals like Ctrl-C
How to shut down a ÃMQ application cleanly
How to check a ÃMQ application for memory leaks
How to send and receive multipart messages
How to forward messages across networks
How to build a simple message queuing broker
How to write multithreaded applications with ÃMQ
How to use ÃMQ to signal between threads
How to use ÃMQ to coordinate a network of nodes
How to create and use message envelopes for publish-subscribe
How to use the high-water mark (HWM) to protect against memory overflows
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