[Backgroundrb-devel] Problems running backgroundrb

John Wells lists at sourceillustrated.com
Mon Feb 11 13:35:20 EST 2008


On Feb 11, 2008 1:28 PM, hemant <gethemant at gmail.com> wrote:
> On Mon, Feb 11, 2008 at 8:20 PM, John Wells <lists at sourceillustrated.com> wrote:
> > On Feb 11, 2008 5:03 AM, hemant kumar <gethemant at gmail.com> wrote:
> >  >
> >  > On Mon, 2008-02-11 at 00:55 -0800, Alex Soto wrote:
> >  > > does require 'lib/formatters' work?
> >  > >
> >  > >
> >  > > On Feb 10, 2008, at 10:11 PM, John Wells wrote:
> >  > >
> >  > > > Hi guys,
> >  > > >
> >  > > > New to backgroundrb, and I like it very much conceptually, but I'm
> >  > > > struggling to get it to run successfully. I started with trunk, but
> >  > > > was getting a very strange gem require error when starting a worker
> >  > > > (though it wasn't telling me which gem was missing)....see here:
> >  > > > http://pastie.caboo.se/150225
> >  >
> >  > Its not complaining about any missing gems, rather its not able to load
> >  > workers defined inside lib/workers directory. You must define at least
> >  > one worker, before you can start bdrb. In case, you have already defined
> >  > a worker, Can we have a look at the code of your worker?
> >
> >  Thanks for your help. Sure thing...the code is below. However, I'm
> >  very curious...how did you determine this was the problem? Just so I
> >  know what to look for in the future.
>
> Because, when I saw error at:
>
> http://pastie.caboo.se/150225
>
> It clearly says thats start_worker is failing on 114 line. Generally
> this happens, when bdrb is not able to load a particular worker file.
> Also, you see empty string "gem_original_require': no such file to
> load --  (LoadError)" because bdrb is not able to get name of worker
> file to load correctly.
>
>
>
> >
> >  ===== controller that instantiates worker =====
> >  class Admin::BatchController < Admin::ApplicationController
> >
> >   def initialize
> >     super
> >     @formats = GW::BatchListing::ListingRow.formats
> >     @part_of = :admin
> >   end
> >
> >   def get_progress
> >     if request.xhr?
> >       progress_percent = MiddleMan.get_worker(session[:job_key]).progress
> >       render :update do |page|
> >         page.call('progressPercent', 'progressbar', progress_percent)
> >         page.redirect_to( :action => 'done')   if progress_percent >= 100
> >       end
> >     else
> >       redirect_to :action => 'index'
> >     end
> >   end
> >
> >   def done
> >     errors = "DONE " + MiddleMan.get_worker(session[:job_key]).errors
> >     if errors.size > 0
> >       flash[:notice] = errors.join("<br/>")
> >     else
> >       flash[:notice] = "Successful load."
> >     end
> >     MiddleMan.delete_worker(session[:job_key])
> >   end
> >
> >   def add
> >     @user = User.find(params[:id])
> >     @cats = Category.find(:all, :conditions=>"parent_id is null")
> >     if request.post?
> >       listings = params[:listings]
> >       content_type = listings.content_type.chomp
> >       if "application/zip"!=content_type and
> >          "application/x-zip-compressed"!=content_type
> >         flash[:notice] =
> >           "Only files of type application/zip " +
> >           "and application/x-zip-compressed " +
> >           "can be used. You uploaded #{content_type}."
> >       else
> >         # write out to tmp file
> >         tmpfile = "/tmp/#{rand 500000}.zip"
> >         open(tmpfile, "w") do |f|
> >           f << listings.read
> >         end
> >         parser =
> >           GW::BatchListing::ListingParser.new(params[:format],
> >                                                         params[:listing_type],
> >                                                         @user)
> >         session[:job_key] =
> >             MiddleMan.new_worker(:class => :foo_worker,
> >                                  :args => parser)
> >       end
> >     end
> >   end
> >  end
> >
>
> There are couple of problems with above code, for example,
> MiddleMan.get_worker is not defined. To get an idea about, which
> methods are defined for MiddleMan, have a look at,
>
> http://backgroundrb.rubyforge.org/classes/BackgrounDRb/WorkerProxy.html
>
> Also, you should read README file that comes with plugin.
>
> >  ===== and the worker itself =====
> >  class BatchImportWorker < BackgrounDRb::MetaWorker
> >   attr_reader :progress
> >   attr_reader :errors
> >   set_worker_name :batch_import_worker
> >
> >   def create(args = nil)
> >     # this method is called, when worker is loaded for the first time
> >   end
> >
> >   def do_work(parser)
> >     @progress = 0
> >     @errors = parser.process(tmpfile)
> >   end
> >  end
>
> Well, I find  no problems with above worker code, and it should load.
> Create a fresh rails app and see if bdrb works there.

Ok, sorry... I was working from the old InfoQ article by Ezra and the
api docs. I probably made some bad assumptions there...I will take a
hard look and try it again.

Thanks for your help!

John


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