Ruby on Rails: keep collecting data in background and store in DB

Question

Here is my scenario: I have some data coming into serial port. I want to keep collecting this data and store in the database. Then the rails app uses this data from the database and shows some statistics like graphs and stuff.

So my question is how can I keep collecting this data in a separate thread from the rails app, while the rest of the things work like any other rails app on the database.

If there is a better way of doing this please advice.

PS: I dont have any problem in reading from serial port. This is about doing this task from rails app in separate thread.

Vasiliy Ermolovich · Accepted Answer · 2011-05-07 09:14:16Z

1

Use the delayed_job gem.

Delayed_job (or DJ) encapsulates the common pattern of asynchronously executing longer tasks in the background.

answered May 7, 2011 at 9:14

Vasiliy Ermolovich

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4 Comments

Shaunak Over a year ago

i am confused. can you please explain in a bit detail how will this help my case?

Vasiliy Ermolovich Over a year ago

you can watch the railscast about this gem - railscasts.com/episodes/171-delayed-job or the text version - asciicasts.com/episodes/171-delayed-job

Shaunak Over a year ago

okay! i just saw the railcast and looks like thats exactly what I need. I have a couple of questions though. The send_later method in the railcast is being called in a particular method of a controller. I want my task to begin as soon as rail app starts (server starts). Also the job i am running has no connection to any controller as such, so where should i add the method to be called using send_later? and finally my job runs indefinitely, how does that affect this arrangement?

Vasiliy Ermolovich Over a year ago

If you are using capistrano for the deployment look at this - github.com/collectiveidea/delayed_job/wiki/…. And if you want to add some jobs without connection to any controller, you can add these jobs in your config\initializers folder

Omri Cohen · Accepted Answer · 2011-12-21 07:33:30Z

1

Another thing you can check out is the resque gem which github published, it makes use of redis as a working queue, and has a very handy web interface, that helps controlling the working threads. It is very similar to delayed jobs, but may fit your needs in a better way.

answered Dec 21, 2011 at 7:33

Omri Cohen

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