April 2012
Intermediate to advanced
204 pages
5h 42m
English
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MQ Protocols
We used a mailman analogy earlier to describe Node’s event loop. If the mailman were to arrive at a closed gate, he would be unable to deliver his message; but imagine an elderly and kind groundskeeper was in the process of opening the gate so the mailman could pass through. Being elderly and somewhat frail from his years of service, it takes the groundskeeper some time to clear the way—time during which the mailman is unable to deliver any messages.
This situation is a blocking process, but it is not a permanent state. Evenually the groundskeeper will manage to get the gate open, and the mailman will go about his business. Every house the mailman reaches with a similar gate-opening process will slow down the overall route. In the context of a Node application, this type of block will seriously degrade performance.
In the computer realm, similar situations may be caused by sending a user email during a registration process, by lots of math that needs to be done as a result of user input, or by any situation in which the time it takes to complete a task exceeds a user’s normally expected wait times. Node’s event-driven design handles the majority of these situations for you by using asynchronous functions and callbacks, but when an event is particularly “heavy” to process, it doesn’t make sense to process it inside Node. Node should only take care of handling results and fast operations.
By way of example, consider a generic user registration process. When a user registers ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.