介绍 #

跑在erlang虚拟机上
与erlang相同，actor称作进程, 是比线程更轻量的概念

使用 #

o-> 元组
{:foo, "this", 42}
        # 三元组

o-> actor
defmodule Talker do
def loop do
    receive do
    {:greet, name, age} -> IO.puts("Hello #{name}")
    {:shutdown} -> exit(:normal)
    end
    loop
end
end

pid = spawn(&Talker.loop/0)
send(pid, {:greet, "Huey", 16})
sleep(1000)

Process.flag(:trap_exit, true)
pid = spawn_link(&Takler.loop/0)
send(pid, {:shutdown})
receive do
{:EXIT, ^pid, reason} -> IO.puts("Talker has exited (#{reason})")
end

o-> 有状态的actor
        # 递归
defmodule Counter do
def start(count) do
    spawn(__MODULE__, :loop, [count])
            # 伪变量__MODULE__, 是当前模块的名字
end
def next(counter) do
    send(counter, {:next})
end
def loop(count) do
    receive do
    {:next} ->
        IO.puts("Current count: #{count}")
        loop(count + 1)
    end
end
end
counter = spawn(Counter, :loop, [1])
send(counter, {:next})

counter = Countre.start(42)
Counter.next(counter)