Erlang u praksi

WebCamp Zagreb, 2012

Transcript

1. Erlang u praksi sasa.juric@minus5.hr
2. Korisnici
3. Platforma • jezik • framework (OTP) • runtime
4. Konkurentnost spawn(...)
5. Konkurentnost scheduler spawn(...)
6. Konkurentnost scheduler CPU scheduler CPU scheduler CPU scheduler CPU spawn(...)
7. Komunikacija P1 poruka P2 P2 = spawn(...), P2 ! Poruka receive Poruka1 -> ... Poruka2 -> ... ... end
8. Komunikacija P1 poruka odgovor P2 P2 ! {self(), ...}, receive ... receive {Sender, ...} -> ... Sender ! Response end
9. Stanje A = 5, A = A + 1
10. Stanje S f(Stanje) -> Poruka = receive ... end, NovoStanje = f2(Poruka, Stanje), f(NovoStanje).
11. Stanje {set, ...} {get, ...} P S f(Stanje) -> Poruka = receive ... end, NovoStanje = f2(Poruka, Stanje), f(NovoStanje).
12. Actor model actor actor actor actor actor actor
13. Supervisor S W
14. Supervisor W S S S W W W S W W W W
15. Http server http_server request_1 request_n request response response
16. Http server http_server stanje request_1 request_n request response response
17. Push server korisnik_1 korisnik_2 korisnik_n kanal_2 kanal_1 podaci podaci
18. Push server <= 3000 paralelnih korisnika ≈ 30 kanala > 2000 requesta u sekundi
19. Erlang • actor model • supervisor • distribuiranost • mnesia • hot code swapping • interoperabilnost • alati
20. Primjena • server • skalabilnost • dinamički requesti
21. Linkovi • Why Erlang? • Programming Erlang • Learn You Some Erlang for Great Good! • Erlang and OTP in Action • A History of Erlang • erlang.org • Erlang Programming Group