PlanetEx Lightning Talk

This lightning talk was given during a Brown Bag at SEP.

It elaborates on how the PlanetEx application utilizes the Elixir/Erlang/OTP ecosystem behind the scenes.

Transcript

1. WELCOME TO PLANET EX
2. WHAT IS PLANET?
3. PLANET.SEP.COM
4. #PLANET
5. ELIXIR, ERLANG & OTP
6. ELIXIR, ERLANG & OTP > Elixir is a functional programming language that compiles to the Erlang virtual machine > Erlang is a functional programming language built for concurrent, distributed applications. > OTP is a set of Erlang libraries: the Erlang runtime system, a number concurrency primitives, and a set of design principles for Erlang programs
7. THE CORE OF PLANET EX
8. V1
10. FEED SERVER MAILBOX > :rebuild_feed > async > Recursive, sends itself this message every 60 seconds. > :status > sync > Returns the built feed.
11. WHY IS THIS NOT GOOD? defp build_feed(feed) do Feeds.list_rss() |> Enum.map(fn rss -> rss |> @fetcher.get() |> FeedParser.parse() end) |> FeedParser.Feed.merge(feed) end
13. V2
16. WRITE FEED TO DISK JOB
17. REFRESH FEED STORE JOB
18. ADD A NEW FEED
19. REMOVE AN OLD FEED
20. :REBUILD_FEED def handle_info(:rebuild_feed, state) do self() |> fetch_and_build(state) |> Task.start() schedule(state.timeout) {:noreply, state} end
21. :REBUILD_FEED defp fetch_and_build(server_pid, state) do fn -> put_feed( server_pid, build_feed(state.rss) ) end end