Rails 异步发送邮件和测试

异步执行在当前(这个东西在rails的领域,变化的可能很大,总是有更好用的插件,更酷的想法冒出来)

最流行的应该就是delayed_job,这个的资料比较多,例如,railscast就有介绍。所以, 老猪这里就简单说说用法。delayed_job异步思路还是,在需要调用的地方加delay,例外启动一个deamon,处理任务。
其中,railscast的介绍已经被JE某XD翻译了,用到的参考 http://enn.iteye.com/blog/632960
原本地址:
http://asciicasts.com/episodes/171-delayed-job

并该方案当前的Rails 3解决方案JE也有

参考如下:

http://t0uch.iteye.com/blog/673336

安装:
script/plugin install git://github.com/collectiveidea/delayed_job.git


生成:
  script/generate delayed_job


rake db:migrate
#后台处理
rake jobs:work


生成表如下:
  create_table :delayed_jobs, :force => true do |table|
    table.integer  :priority, :default => 0      # Allows some jobs to jump to the front of the queue
    table.integer  :attempts, :default => 0      # Provides for retries, but still fail eventually.
    table.text     :handler                      # YAML-encoded string of the object that will do work
    table.string   :last_error                   # reason for last failure (See Note below)
    table.datetime :run_at                       # When to run. Could be Time.now for immediately, or sometime in the future.
    table.datetime :locked_at                    # Set when a client is working on this object
    table.datetime :failed_at                    # Set when all retries have failed (actually, by default, the record is deleted instead)
    table.string   :locked_by                    # Who is working on this object (if locked)
    table.timestamps
  end


另一个知名的解决方案是ar_mailer


ar_mailer的时间要长,用起来和delayed job的解决方案差不多,异步的思路把任务存到数据库,然后,后台任务轮询触发。

和Delayed Job相同,也有一篇介绍Rails 3使用的在letrails上
http://www.letrails.cn/archives/ar_mailer-rails-3-plugi
老猪自己当前的项目用的ar_mailer

大致使用如下:

$ sudo gem install adzap-ar_mailer


  config.gem "adzap-ar_mailer"

  ./script/generate ar_mailer


  #config/environments/production.rb 

  config.action_mailer.delivery_method = :activerecord


启动后台

 $ ar_sendmail



最后,测试异步的发送邮件

也是使用一个插件,保证在测试环境邮件并不真正发送,就可以验证了
 #$ ./script/plugin install git://github.com/ngty/action_mailer_cache_delivery.git


#RAILS_ROOT/config/environments/test.rb, 

  config.action_mailer.delivery_method = :cache

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