Erlang u praksi - Speaker Deck

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Erlang u praksi sasa.juric@minus5.hr

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Korisnici

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Platforma ● jezik ● framework (OTP) ● runtime

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Konkurentnost spawn(...)

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Konkurentnost scheduler spawn(...)

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Konkurentnost scheduler CPU scheduler CPU scheduler CPU scheduler CPU spawn(...)

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Komunikacija P1 poruka P2 P2 = spawn(...), P2 ! Poruka receive Poruka1 -> ... Poruka2 -> ... ... end

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Komunikacija P1 poruka odgovor P2 P2 ! {self(), ...}, receive ... receive {Sender, ...} -> ... Sender ! Response end

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Stanje A = 5, A = A + 1

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Stanje S f(Stanje) -> Poruka = receive ... end, NovoStanje = f2(Poruka, Stanje), f(NovoStanje).

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Stanje {set, ...} {get, ...} P S f(Stanje) -> Poruka = receive ... end, NovoStanje = f2(Poruka, Stanje), f(NovoStanje).

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Actor model actor actor actor actor actor actor

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Supervisor S W

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Supervisor W S S S W W W S W W W W

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Http server http_server request_1 request_n request response response

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Http server http_server stanje request_1 request_n request response response

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Push server korisnik_1 korisnik_2 korisnik_n kanal_2 kanal_1 podaci podaci

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Push server <= 3000 paralelnih korisnika ≈ 30 kanala > 2000 requesta u sekundi

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Erlang ● actor model ● supervisor ● distribuiranost ● mnesia ● hot code swapping ● interoperabilnost ● alati

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Primjena ● server ● skalabilnost ● dinamički requesti

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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