通过在应用程序启动时启动工作程序来初始化“延迟作业” gem [英] Initialize the Delayed Jobs gem by starting the workers on application start

问题描述

我正在使用Ruby on Rails 3.0.9，并且试图设置 delay_job gem。如果重新启动Apache2服务器后，我可以在Terminal\Console中运行以下命令，则所有工作正常：

I am using Ruby on Rails 3.0.9 and I am trying to setup the delay_job gem. All works if, after rebooting the Apache2 server, I run in the Terminal\Console following commands:

RAILS_ENV=development script/delayed_job stop
RAILS_ENV=development script/delayed_job -n 2 start

但是，因为我总是要在应用程序启动时启动工作程序，请在我的 config / initializers / delayed_job.rb 中添加以下代码（可同时处理开发和生产模式）：

However, since I always want to start the workers on application start, in my config/initializers/delayed_job.rb I add the following code (that handles both development and production mode):

if Rails.env.development?
  system 'RAILS_ENV=development script/delayed_job stop'
  system 'RAILS_ENV=development script/delayed_job -n 2 start'
elsif Rails.env.production?
  system 'RAILS_ENV=production script/delayed_job stop'
  system 'RAILS_ENV=production script/delayed_job -n 2 start'
end

但是，通过使用上面的代码并重新启动Apache2服务器之后，DJ gem无法正常工作。也就是说，当我在Terminal\Console中运行上述命令行时，它不会处理作业。

However, by using the above code and after re-rebooting the Apache2 server, the DJ gem doesn't work anymore as expected. That is, it doesn't process jobs as it makes when I run the above command lines in the Terminal\Console.

如何制作DJ来工作正常吗？有什么问题？

PS：我想这样做是为了使流程自动化。

P.S.: I would like to do that in order to automatize processes.

它表明 config / initializers / delayed_job.rb 文件中的上述代码没有创建 RAILS_ROOT / tmp / pids 目录中与DJ相关的 pids文件。只能通过手动运行上述命令行来创建它们。为什么会发生这种情况？

It seams that the above code in the config/initializers/delayed_job.rb file doesn't "create" the "pids" files related to DJ in the RAILS_ROOT/tmp/pids directory. Those are created only by running the above command lines manually. Why this happens?

更新用于 @Devin M

我的 config / initializers / delayed_job.rb 包含：

# Options
Delayed::Worker.destroy_failed_jobs = false
Delayed::Worker.sleep_delay = 2
Delayed::Worker.max_attempts = 5
Delayed::Worker.max_run_time = 1.hour
Delayed::Worker.delay_jobs = !Rails.env.test?

if Rails.env.development?
  system "RAILS_ENV=development #{Rails.root.join('script','delayed_job')} stop"
  system "RAILS_ENV=development #{Rails.root.join('script','delayed_job')} -n 2 start"
elsif Rails.env.production?
  system "RAILS_ENV=production #{Rails.root.join('script','delayed_job')} stop"
  system "RAILS_ENV=production #{Rails.root.join('script','delayed_job')} -n 2 start"
end

推荐答案

尝试使用以下代码：

system "RAILS_ENV=production #{Rails.root.join('script','delayed_job')} stop"
system "RAILS_ENV=production #{Rails.root.join('script','delayed_job')} -n 2 start"

在控制台中对其进行测试将产生以下输出，指示其应可正常工作：

Testing it in the console produced this output which indicates it should work:

Loading development environment (Rails 3.0.9)
ruby-1.9.2-p290 :001 > Rails.root.join('script','delayed_job')
 => #<Pathname:/home/devin/testsoapp/script/delayed_job> 
ruby-1.9.2-p290 :002 > "RAILS_ENV=production #{Rails.root.join('script','delayed_job')} -n 2 start"
 => "RAILS_ENV=production /home/devin/testsoapp/script/delayed_job -n 2 start" 
ruby-1.9.2-p290 :003 > 

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