[Backgroundrb-devel] Getting started

[Richard Everhart]

Changing 'class' to 'worker' in new_worker seemed to get things going.
 I can see that after new_worker is called the worker's create method
is then called.  This only seems to work once. After the first time, I
get the following error:

You have a nil object when you didn't expect it!
The error occurred while evaluating nil.send_request
/home/reverhart/drb_test/vendor/plugins/backgroundrb/framework/packet_master.rb:43:in
`ask_worker'
/home/reverhart/drb_test/vendor/plugins/backgroundrb/server/master_worker.rb:76:in
`process_work'
/home/reverhart/drb_test/vendor/plugins/backgroundrb/server/master_worker.rb:34:in
`receive_data'
/home/reverhart/drb_test/vendor/plugins/backgroundrb/lib/../framework/bin_parser.rb:29:in
`call'
/home/reverhart/drb_test/vendor/plugins/backgroundrb/lib/../framework/bin_parser.rb:29:in
`extract'
/home/reverhart/drb_test/vendor/plugins/backgroundrb/server/master_worker.rb:30:in
`receive_data'
/home/reverhart/drb_test/vendor/plugins/backgroundrb/framework/core.rb:195:in
`read_external_socket'
/home/reverhart/drb_test/vendor/plugins/backgroundrb/framework/core.rb:187:in
`handle_external_messages'
[...snip...]

Eventually, what I would really like to do is return a value back to
the browser.  send_request is documented to do this but the browser
just hangs and I really can't tell if the the worker method (do_work
in this is being executed).  While the work is being executed by the
worker I'd like to display a progress bar or a busy indicator, both of
which I've seen examples.  But, it seems that the do_work method is
never called, even when calling ask_work, which is not supposed to
block.

I have not tried out the latest version so I'm not sure if that will
change things.  Thanks a lot!

Rich

On Thu, Feb 14, 2008 at 3:24 PM, hemant <gethemant at gmail.com> wrote:
> On Fri, Feb 15, 2008 at 4:15 AM, Richard Everhart
>
> <rich.everhart at gmail.com> wrote:
>
> > Thanks, Hemant.  I made the change related to the job key and I'm not
>  >  getting a value back from new_worker.  However, the 'not able to
>  >  connect error' is on going.
>  >
>  >  My zipped up app is attached.  Thanks for helping me out.
>  >
>
>  First Problems with your controller code:
>
>  You have line:
>
>
>  session[:job_key] = MiddleMan.new_worker(:class => :fibonacci_worker,
>  :job_key => 'the_key', :data => params[:input])
>
>  Please note that, it should be :worker not :class, so please change the line to:
>    session[:job_key] = MiddleMan.new_worker(:worker =>
>  :fibonacci_worker, :job_key => 'the_key', :data => params[:input])
>
>  Now, You have line:
>
>
>    MiddleMan.send_request(:worker => :fibonacci_worker, :worker_method
>  => :do_work, :data => params[:input])
>
>  Again, as i said earlier, when you are creating a worker with a
>  "job_key" you *must* always access that instance of worker with the
>  same job key and hence it should be:
>
>
>    MiddleMan.send_request(:worker => :fibonacci_worker, :worker_method
>  => :do_work, :data => params[:input], :job_key => session[:job_key])
>
>  Your worker code is perfectly fine and should work as it. Also, update
>  your plugin from trunk and remove "backgroundrb" script present in
>  script directory and restart the server and try now. It will work.
>
>
>  --
>  Let them talk of their oriental summer climes of everlasting
>  conservatories; give me the privilege of making my own summer with my
>  own coals.
>
>  http://gnufied.org
>