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Elixir - valentine edition
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Saša Jurić
February 14, 2017
Programming
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120
Elixir - valentine edition
Saša Jurić
February 14, 2017
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Transcript
Elixir @sasajuric aircloak.com
None
None
otpornost na pogreške skalabilnost responzivnost
Erlang LFE Elixir Erlang VM (BEAM)
None
v1 = f1(p1, p2, ...) v2 = f2(...) ...
spawn(fn -> ... end) A B
OS proces BEAM proces
scheduler scheduler scheduler scheduler BEAM instanca CPU CPU CPU CPU
pid = spawn(fn -> ... end)
pid = spawn(fn -> ... end) send(pid, :ping)
spawn(fn -> receive do :ping -> # ... end end)
send(pid, {:ping, self()})
spawn(fn -> receive do {:ping, caller_pid} -> send(caller_pid, :pong) end
end)
send(pid, {:ping, self()}) receive do :pong -> # ... after
:timer.seconds(5) -> # ... end
pid = spawn(fn -> server_loop(state) end)
defp server_loop(state) do receive do message -> new_state = handle(state,
message) server_loop(new_state) end end
bank account balance
send(pid, {:deposit, 100}) send(pid, {:withdraw, 100}) send(pid, {:balance, self()}) receive
do balance -> # ... end
spawn(fn -> bank_account_loop(0) end)
def bank_account_loop(balance) do receive do {:deposit, amount} -> bank_account_loop(balance +
amount) {:withdraw, amount} -> bank_account_loop(balance - amount) {:balance, caller_pid} -> send(caller_pid, balance) bank_account_loop(balance) end end
bank account {:deposit, amount} {:withdraw, amount} :balance
None
db connection background job request handler state request handler request
handler request handler request handler request handler state state state background job background job background job db connection db connection db connection
A B C D E F
A exit notifikacija B C D E F
S S S W W S W W W S
W W
VM VM VM VM VM
VM send(pid, message) VM 1 send(pid, message) VM 2
elixir-lang.org phoenixframework.org adventofcode.com exercism.io elixirforum.com meetup.com/lambdazagreb/