Backgroundrb devel - Jan 2007 - Instantiating middleman and worker from inside a model?

In short: how (if possible) would i go about arranging it so that i  
can instantiate a middleman and set a worker going from within a  
method in one of my models? or is this a weird thing to be wanting to  
do? (

My specific situation: I have an ''Image'' model in my
application. An
actual image file associated with the model is being stored on  
amazons s3 system. I''d like to use a worker to handle each s3  
operation (eg. deleting the image from s3). The Image model seems the  
neatest place to set the worker going but I''m a little stumped as to  
how i should modify my model to enable the instantiation of middleman  
within it.

thanks in advance for any pointers!

(apologies in advance if this message gets posted twice; i think my  
previous attempt didn''t work)

Just call work_thread on the worker.
Something like....

def save_to_s3
  worker.work_thread(:method => :save, :args => [args])
end

def worker
  @worker ||= MiddleMan.worker(:s3)
end

If you need to pass the whole model to the worker, make sure to add
include DRbUndumped in your model.

On 1/15/07, Tomasz Kaye <tomasz at resourcestudio.nl>
wrote:
>
> In short: how (if possible) would i go about arranging it so that i
> can instantiate a middleman and set a worker going from within a
> method in one of my models? or is this a weird thing to be wanting to
> do? (
>
> My specific situation: I have an ''Image'' model in my
application. An
> actual image file associated with the model is being stored on
> amazons s3 system. I''d like to use a worker to handle each s3
> operation (eg. deleting the image from s3). The Image model seems the
> neatest place to set the worker going but I''m a little stumped as
to
> how i should modify my model to enable the instantiation of middleman
> within it.
>
> thanks in advance for any pointers!
>
> (apologies in advance if this message gets posted twice; i think my
> previous attempt didn''t work)
> _______________________________________________
> Backgroundrb-devel mailing list
> Backgroundrb-devel at rubyforge.org
> http://rubyforge.org/mailman/listinfo/backgroundrb-devel
>
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Thanks joshua, i thought i had tried this before but evidently i had  
something wrong, it''s working fine now :)

On Jan 15, 2007, at 7:51 PM, Joshua Bates wrote:
> Just call work_thread on the worker.
> Something like....
>
> def save_to_s3
>   worker.work_thread(:method => :save, :args => [args])
> end
>
> def worker
>   @worker ||= MiddleMan.worker(:s3)
> end
>
> If you need to pass the whole model to the worker, make sure to add
> include DRbUndumped in your model.
>
> On 1/15/07, Tomasz Kaye < tomasz at resourcestudio.nl> wrote:
> In short: how (if possible) would i go about arranging it so that i
> can instantiate a middleman and set a worker going from within a
> method in one of my models? or is this a weird thing to be wanting to
> do? (
>
> My specific situation: I have an ''Image'' model in my
application. An
> actual image file associated with the model is being stored on
> amazons s3 system. I''d like to use a worker to handle each s3
> operation (eg. deleting the image from s3). The Image model seems the
> neatest place to set the worker going but I''m a little stumped as
to
> how i should modify my model to enable the instantiation of middleman
> within it.
>
> thanks in advance for any pointers!
>
> (apologies in advance if this message gets posted twice; i think my
> previous attempt didn''t work)
> _______________________________________________
> Backgroundrb-devel mailing list
> Backgroundrb-devel at rubyforge.org
> http://rubyforge.org/mailman/listinfo/backgroundrb-devel
>
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I spoke too soon, i''m still stuck with the same problem (sorry).  
Perhaps if i show how my model looks it''ll be obvious what i''m
doing
wrong;

class Image < ActiveRecord::Base

   def destroy
       s3delete
       super
     end

     def s3delete)
       MiddleMan.new_worker(
       :class => :s3_worker
       )
     end

end

When i call destroy on an image model I''m getting the error:  
"NameError (uninitialized constant S3Worker):" . which is to be  
expected i suppose. How should i make S3Worker visible in this scope?

thanks again.

On Jan 15, 2007, at 7:51 PM, Joshua Bates wrote:
> Just call work_thread on the worker.
> Something like....
>
> def save_to_s3
>   worker.work_thread(:method => :save, :args => [args])
> end
>
> def worker
>   @worker ||= MiddleMan.worker(:s3)
> end
>
> If you need to pass the whole model to the worker, make sure to add
> include DRbUndumped in your model.
>
> On 1/15/07, Tomasz Kaye < tomasz at resourcestudio.nl> wrote:
> In short: how (if possible) would i go about arranging it so that i
> can instantiate a middleman and set a worker going from within a
> method in one of my models? or is this a weird thing to be wanting to
> do? (
>
> My specific situation: I have an ''Image'' model in my
application. An
> actual image file associated with the model is being stored on
> amazons s3 system. I''d like to use a worker to handle each s3
> operation (eg. deleting the image from s3). The Image model seems the
> neatest place to set the worker going but I''m a little stumped as
to
> how i should modify my model to enable the instantiation of middleman
> within it.
>
> thanks in advance for any pointers!
>
> (apologies in advance if this message gets posted twice; i think my
> previous attempt didn''t work)
> _______________________________________________
> Backgroundrb-devel mailing list
> Backgroundrb-devel at rubyforge.org
> http://rubyforge.org/mailman/listinfo/backgroundrb-devel
>
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as i understand it the S3Worker class does not need to be visible in the 
scope of the Image model. Only the MiddleMan class needs to be visible. 
You pass the :s3_worker symbol to the MiddleMan class and it uses that 
symbol to find the correct class on the other side of the drb connection 
  (ie in the backgroundrb_server process, not here in the rails process).

So i suggest going through a laundry list of different situations to see 
if this works anywhere in your code.
-is that erroneous parentheses in "def s3delete)" only in your email?
-can you call worker(:class => s3_worker) from the backgroundrb console?
-try making a different method for the image class does nothing but 
instantiate an s3_worker and calling it in the rails console.
-double check the class code for S3Worker to make sure the symbol 
:s3_worker will clearly resolve to both the class name and the file name.
-try removing the 3 from the class name; it''s not supposed to be a 
problem because it''s not the first character of the name but i feel
like
i''ve had a problem with numbers in class names before.

--jacob


Tomasz Kaye wrote:
> I spoke too soon, i''m still stuck with the same problem (sorry).
Perhaps
> if i show how my model looks it''ll be obvious what i''m
doing wrong;
> 
> class Image < ActiveRecord::Base   
>   
>   def destroy
>       s3delete
>       super
>     end
> 
>     def s3delete)
>       MiddleMan.new_worker(
>       :class => :s3_worker
>       )    
>     end 
> 
> end
> 
> When i call destroy on an image model I''m getting the error:
"NameError
> (uninitialized constant S3Worker):" . which is to be expected i
suppose.
> How should i make S3Worker visible in this scope?
> 
> thanks again.
> 
> On Jan 15, 2007, at 7:51 PM, Joshua Bates wrote:
> 
>> Just call work_thread on the worker.
>> Something like....
>>
>> def save_to_s3
>>   worker.work_thread(:method => :save, :args => [args])
>> end
>>
>> def worker
>>   @worker ||= MiddleMan.worker(:s3)
>> end
>>
>> If you need to pass the whole model to the worker, make sure to add
>> include DRbUndumped in your model.
>>
>> On 1/15/07, *Tomasz Kaye* < tomasz at resourcestudio.nl 
>> <mailto:tomasz at resourcestudio.nl>> wrote:
>>
>>     In short: how (if possible) would i go about arranging it so that i
>>     can instantiate a middleman and set a worker going from within a
>>     method in one of my models? or is this a weird thing to be wanting
to
>>     do? (
>>
>>     My specific situation: I have an ''Image'' model in
my application. An
>>     actual image file associated with the model is being stored on
>>     amazons s3 system. I''d like to use a worker to handle each
s3
>>     operation (eg. deleting the image from s3). The Image model seems
the
>>     neatest place to set the worker going but I''m a little
stumped as to
>>     how i should modify my model to enable the instantiation of
middleman
>>     within it.
>>
>>     thanks in advance for any pointers!
>>
>>     (apologies in advance if this message gets posted twice; i think my
>>     previous attempt didn''t work)
>>     _______________________________________________
>>     Backgroundrb-devel mailing list
>>     Backgroundrb-devel at rubyforge.org
>>     <mailto:Backgroundrb-devel at rubyforge.org>
>>     http://rubyforge.org/mailman/listinfo/backgroundrb-devel
>>
>>
> 
> 
> ------------------------------------------------------------------------
> 
> _______________________________________________
> Backgroundrb-devel mailing list
> Backgroundrb-devel at rubyforge.org
> http://rubyforge.org/mailman/listinfo/backgroundrb-devel

give:
  MiddleMan.instance.new_worker :class => :s3_worker

a try

* Tomasz Kaye (tomasz at resourcestudio.nl) [070116
10:37]:
>    I spoke too soon, i''m still stuck with the same problem
(sorry). Perhaps
>    if i show how my model looks it''ll be obvious what i''m
doing wrong;
>    class Image < ActiveRecord::Base
> 
>      def destroy
>          s3delete
>          super
>        end
>        def s3delete)
>          MiddleMan.new_worker(
>          :class => :s3_worker
>          )
>        end
>    end
>    When i call destroy on an image model I''m getting the error:
"NameError
>    (uninitialized constant S3Worker):" . which is to be expected i
suppose.
>    How should i make S3Worker visible in this scope?
>    thanks again.
>    On Jan 15, 2007, at 7:51 PM, Joshua Bates wrote:
> 
>      Just call work_thread on the worker.
>      Something like....
> 
>      def save_to_s3
>        worker.work_thread(:method => :save, :args => [args])
>      end
> 
>      def worker
>        @worker ||= MiddleMan.worker(:s3)
>      end
> 
>      If you need to pass the whole model to the worker, make sure to add
>      include DRbUndumped in your model.
> 
>      On 1/15/07, Tomasz Kaye < [1]tomasz at resourcestudio.nl> wrote:
> 
>        In short: how (if possible) would i go about arranging it so that i
>        can instantiate a middleman and set a worker going from within a
>        method in one of my models? or is this a weird thing to be wanting
to
>        do? (
> 
>        My specific situation: I have an ''Image'' model in
my application. An
>        actual image file associated with the model is being stored on
>        amazons s3 system. I''d like to use a worker to handle each
s3
>        operation (eg. deleting the image from s3). The Image model seems
the
>        neatest place to set the worker going but I''m a little
stumped as to
>        how i should modify my model to enable the instantiation of
middleman
>        within it.
> 
>        thanks in advance for any pointers!
> 
>        (apologies in advance if this message gets posted twice; i think my
>        previous attempt didn''t work)
>        _______________________________________________
>        Backgroundrb-devel mailing list
>        [2]Backgroundrb-devel at rubyforge.org
>        [3]http://rubyforge.org/mailman/listinfo/backgroundrb-devel
> 
> References
> 
>    Visible links
>    1. mailto:tomasz at resourcestudio.nl
>    2. mailto:Backgroundrb-devel at rubyforge.org
>    3. http://rubyforge.org/mailman/listinfo/backgroundrb-devel
> _______________________________________________
> Backgroundrb-devel mailing list
> Backgroundrb-devel at rubyforge.org
> http://rubyforge.org/mailman/listinfo/backgroundrb-devel
-- 
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|\|\             where in the       |          s_u_b_s_t_r_u_c_t_i_o_n 
| | >===========  W.A.S.T.E.        |                  genarratologies 
|/|/    (_)     is the wisdom       |                  skaar at waste.org
----------------------------------------------------------------------

thats for all the suggestions and help! I think in the end it was a  
stray ''end'' that was causing the errors, and i was looking for
something more complicated. apologies for not checking my code more  
thoroughly!