December 2019
Intermediate to advanced
248 pages
5h 34m
English
Content preview from Designing Elixir Systems With OTPBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Prefer Call Over Cast to Provide Back Pressure
Intuitively, you might think that it’s best to use the one-way handle_cast to send messages that don’t need responses. For example, the :add_template message doesn’t really need a response. We just trust that the template was added successfully. If it’s not, something has gone horribly wrong. There’s nothing we can do beyond crashing the server and reporting the reasons for the crash back to the user.
Interestingly, handle_cast is rarely the best option for sending messages. In this section, we’ll look at one of the reasons why. They are called serializability and back pressure. Let’s explore why.
As you probably know, each Elixir process has a message queue. We’ll call it the mailbox. Unlike ...
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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.