如何排队 rufus-scheduler 作业

Question

我有如下内容：

# myScript.rb

require 'rufus-scheduler'

  def loop
    "hey I am i the loop"
  end 

  def run_schedule(url, count, method, interval)
    puts "running scheduler"

    scheduler = Rufus::Scheduler.new

    scheduler.every interval do

    loop(url, count, method)
    end
  end  

  run_schedule(url, count, method, interval)

我的期望是当我运行:

bundle exec ruby myScript.rb url, count, method, interval

我看到根据间隔向 STD 输出一堆 "hey I am in the loop"。

发生的事情是我退出到命令行提示符并且再也看不到循环运行。

Answer 1

你怎么能期待

def loop
  "hey I am i the loop"
end

将任何内容输出到 stdout（不是 STD）？它只是返回一个字符串，而不是调用 print 或 puts...

# myScript.rb

require 'rufus-scheduler'

def _loop(u, c, m)
  # "loop" is a bad name, it's a Ruby keyword, so using "_loop" instead
  # it's still a bad name

  p "hey I am i the loop"
  p [ Time.now, [ u, c, m ] ]
    # without p or puts nothing gets to stdout
end

$scheduler = Rufus::Scheduler.new
  # creating a single scheduler for the whole script
  # not creating a new scheduler each time run_schedule is called

def run_schedule(url, count, method, interval)

  #puts "running scheduler"
  #scheduler = Rufus::Scheduler.new
    # commenting out...

  $scheduler.every interval do

    _loop(url, count, method)
  end
end

#run_schedule(url, count, method, interval)
run_schedule('url', 'count', 'method', '3s')

$scheduler.join
  # let the Ruby main thread join the scheduler thread so that
  # the Ruby process does not exit and so scheduling may happen

所以它是这样的：

"hey I am i the loop"
[2017-02-08 06:06:01 +0900, ["url", "count", "method"]]
"hey I am i the loop"
[2017-02-08 06:06:05 +0900, ["url", "count", "method"]]
"hey I am i the loop"
[2017-02-08 06:06:08 +0900, ["url", "count", "method"]]

注意脚本末尾的 $scheduler.join。这会阻止 Ruby 进程退出。由于该进程不存在，其中的线程（在我们的例子中，rufus-scheduler 实例中的线程）存在并执行它们的工作。正如预期的那样，您的初始脚本只是退出，释放了所有资源。

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