Seven Concurrency Models in Seven Weeks : When Threads Unravel (9781680504668) by Butcher Paul

Author:Butcher, Paul
Language: eng
Format: epub
Tags: Pragmatic Bookshelf
ISBN: 978-1-937785-65-9
Publisher: Oreilly & Associates Inc

​ send(:cache, {:get, self(), ref, url})

​ ​receive​ ​do​

​ {:ok, ^ref, page} -> page

​ ​end​

​ ​end​

​ ​def​ size ​do​

​ ref = make_ref()

​ send(:cache, {:size, self(), ref})

​ ​receive​ ​do​

​ {:ok, ^ref, s} -> s

​ ​end​

​ ​end​

​

​ ​def​ terminate ​do​

​ send(:cache, {:terminate})

​ ​end​

The put and terminate functions simply take their arguments, package them up as a tuple, and send them as a message. The get and size methods are slightly more complicated, since they both have to wait for a reply. In this case, they are sending a unique reference using the pattern we saw yesterday.

Here’s our actor in use:

​ iex(1)>​ Cache.start_link​

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