AJAX updates for execution progress status

rubyonrails-talk
1

I need to update multiple areas on my page within the same controller, where statuses are updated as test scripts are being run and completed. My js first renders a list of the available test cases to run, then I have a loop running the execution of each script and doing a page.replace_html, but nothing is rendered until everything has finished executing.

I'm wondering how I can display the list first, then have the statuses being updated on the page during the test script execution instead?

2

You want something along the lines of periodically call remote.

I did something vaguely like this and made a little screen cast somewhere... lemmie look...

OK, found it:

And the tutorial:

Hope that helps

Mikel

3

Thanks Mikel, I checked out your screencast and that looks really neat.

I installed the backgroundrb plugin along with the chronic and packet gems but when I try starting the server using:

script/background start

I get the following error in my log file:

/usr/lib/ruby/gems/1.8/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:266:in `load_missing_constant': uninitialized constant BackgrounDRb::Rails (NameError)   from /usr/lib/ruby/gems/1.8/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:453:in `const_missing'   from /home/mil1/QA/svn/QaEngine/trunk/lib/workers/execute_script_worker.rb:1   from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:27:in `gem_original_require'   from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:27:in `require'   from /usr/lib/ruby/gems/1.8/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:496:in `require'   from /usr/lib/ruby/gems/1.8/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:342:in `new_constants_in'   from /usr/lib/ruby/gems/1.8/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:496:in `require'   from /home/mil1/QA/svn/QaEngine/trunk/vendor/plugins/backgroundrb/server/lib/master_proxy.rb:37:in `find_reloadable_worker'   from /home/mil1/QA/svn/QaEngine/trunk/vendor/plugins/backgroundrb/server/lib/master_proxy.rb:35:in `map'   from /home/mil1/QA/svn/QaEngine/trunk/vendor/plugins/backgroundrb/server/lib/master_proxy.rb:35:in `find_reloadable_worker'   from /home/mil1/QA/svn/QaEngine/trunk/vendor/plugins/backgroundrb/server/lib/master_proxy.rb:12:in `initialize'   from script/backgroundrb:46:in `new'   from script/backgroundrb:46

I can't seem to figure it out and I've tried reinstalling the plugin a few times. Would you have any idea what would be the problem?

Thanks, Michelle

Mikel Lindsaar wrote:

4

That screencast is cool, albeit a bit old(meaning your worker code is wrong, in all probability).

You want to perhaps refer:

http://backgroundrb.rubyforge.org/

Also, there is a mailing list and IRC channel for BackgrounDRb, where you can ask questions if in doubt.

(IRC, is not very active all the time).

5

Yup I had followed the instructions on the rubyforge page just to set up the BackgrounDRb without actually setting up any of my own workers. I just try to start the server and I can't get it running...

Hemant Kumar wrote:

6

You are trying to inherit BackgrounDRb::Rails in your worker code(as seen from exception), and that class no longer exists(it has been removed like 6 months back) and hence I asked you to read the documentation and try.

An empty worker looks like:

class BillingWorker < BackgrounDRb::MetaWorker   set_worker_name :billing_worker   def create(args = nil)     # method gets called, when new instance of worker is created.   end end

7

Thanks for the help, I began running server and played around using MiddleMan to create new workers in the client terminal. However, when I try to use methods such as delete_worker() or send_request() I get errors such as this:

NoMethodError: undefined method `delete_worker' for #<BackgrounDRb::ClusterConnection:0xb7496648>

In my background.yml file I only have the following specified so it doesn't seem like I'm using any clustering: