Elixir

• 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)