Ruby ClosedError類用法及代碼示例

當嘗試將消息發送到關閉的端口或從關閉的空端口檢索消息時引發。端口可以使用 Ractor#close_outgoing /close_incoming 顯式關閉，並在 Ractor 終止時隱式關閉。

r = Ractor.new { sleep(500) }
r.close_outgoing
r.take # Ractor::ClosedError

ClosedError 是 StopIteration 的後代，因此關閉 ractor 將打破循環而不傳播錯誤：

r = Ractor.new do
  loop do
    msg = receive # raises ClosedError and loop traps it
    puts "Received: #{msg}"
  end
  puts "loop exited"
end

3.times{|i| r << i}
r.close_incoming
r.take
puts "Continue successfully"

這將打印：

Received: 0
Received: 1
Received: 2
loop exited
Continue successfully