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What Even Is An Erlang? Christopher Meiklejohn Wicked Good Ruby Lightning Talk Friday, October 11, 13

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What do you do? Friday, October 11, 13

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Friday, October 11, 13

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Friday, October 11, 13

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Friday, October 11, 13

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Friday, October 11, 13

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Friday, October 11, 13

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What Even Is An Erlang? Friday, October 11, 13

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Concurrent, garbage-collected, runtime. What Even Is An Erlang? Friday, October 11, 13

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Functional, strict, single assignment, dynamic. What Even Is An Erlang? Friday, October 11, 13

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Actors, hot-code loading, message passing. What Even Is An Erlang? Friday, October 11, 13

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Module example. What Even Is An Erlang? Friday, October 11, 13

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-module(fact). -export([fac/1]). fac(0) -> 1; fac(N) when N > 0, is_integer(N) -> N * fac(N-1). Friday, October 11, 13

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Concurrency and messaging example. What Even Is An Erlang? Friday, October 11, 13

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% Create a process and invoke the function web:start_server(Port, MaxConnections) ServerProcess = spawn(web, start_server, [Port, MaxConnections]), Friday, October 11, 13

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% Create a process and invoke the function web:start_server(Port, MaxConnections) ServerProcess = spawn(web, start_server, [Port, MaxConnections]), % Create a remote process and invoke the function % web:start_server(Port, MaxConnections) on machine RemoteNode RemoteProcess = spawn(RemoteNode, web, start_server, [Port, MaxConnections]), Friday, October 11, 13

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% Create a process and invoke the function web:start_server(Port, MaxConnections) ServerProcess = spawn(web, start_server, [Port, MaxConnections]), % Create a remote process and invoke the function % web:start_server(Port, MaxConnections) on machine RemoteNode RemoteProcess = spawn(RemoteNode, web, start_server, [Port, MaxConnections]), % Send a message to ServerProcess (asynchronously). The message consists of a tuple % with the atom "pause" and the number "10". ServerProcess ! {pause, 10}, Friday, October 11, 13

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% Create a process and invoke the function web:start_server(Port, MaxConnections) ServerProcess = spawn(web, start_server, [Port, MaxConnections]), % Create a remote process and invoke the function % web:start_server(Port, MaxConnections) on machine RemoteNode RemoteProcess = spawn(RemoteNode, web, start_server, [Port, MaxConnections]), % Send a message to ServerProcess (asynchronously). The message consists of a tuple % with the atom "pause" and the number "10". ServerProcess ! {pause, 10}, % Receive messages sent to this process receive a_message -> do_something; {data, DataContent} -> handle(DataContent); {hello, Text} -> io:format("Got hello message: ~s", [Text]); {goodbye, Text} -> io:format("Got goodbye message: ~s", [Text]) end. Friday, October 11, 13

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Erlang/OTP Friday, October 11, 13

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Open Telecom Platform Erlang/OTP Friday, October 11, 13

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Series of design principles; behaviours. Erlang/OTP Friday, October 11, 13

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application: OTP applications Erlang/OTP Friday, October 11, 13

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supervisor: process supervision trees Erlang/OTP Friday, October 11, 13

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gen_server: generic server Erlang/OTP Friday, October 11, 13

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gen_fsm: generic !nite state machine Erlang/OTP Friday, October 11, 13

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gen_event: generic event handler Erlang/OTP Friday, October 11, 13

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Erlang/OTP Supervisors Friday, October 11, 13

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S Friday, October 11, 13

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S F Friday, October 11, 13

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S F F Friday, October 11, 13

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Who Is Using Erlang? Friday, October 11, 13

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ejabberd, Facebook Chat Who Is Using Erlang? Friday, October 11, 13

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RabbitMQ, Chef Who Is Using Erlang? Friday, October 11, 13

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Cloudant, Basho Who Is Using Erlang? Friday, October 11, 13

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League of Legends, Call of Duty Who Is Using Erlang? Friday, October 11, 13

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Try Erlang for your next project! Friday, October 11, 13

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Thanks! Friday, October 11, 13