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tokumei lib chat_room.ex
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lib/chat_room.ex

defmodule ChatRoom do
@default_room :chat
def publish(message, room \\ @default_room) do
:gproc.send({:p, :l, room}, {:message, message})
{:ok, message}
end
def join(room \\ @default_room) do
:gproc.reg({:p, :l, room})
{:ok, room}
end
end