July 2021
Intermediate to advanced
176 pages
4h 14m
English
Content preview from Concurrent Data Processing in ElixirBecome 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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Adding Concurrency with ConsumerSupervisor
Using multiple consumers to process events one by one, concurrently, is a very useful technique. To make this task even easier, GenStage comes with a special type of supervisor called ConsumerSupervisor. It works similarly to a consumer and can subscribe to one or more producers. It can also monitor, start, and restart child processes, just like a supervisor.
What makes ConsumerSupervisor special is that when it receives a list of events from a producer, it automatically starts a process for each event and passes the event as an argument to that process. When a child process exits successfully, new demand will be issued by ConsumerSupervisor and the cycle repeats. This figure illustrates how child processes ...
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