class WidgetWorker < BackgrounDRb::MetaWorker set_worker_name :widget_worker in Java

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class WidgetWorker < BackgrounDRb::MetaWorker set_worker_name :widget_worker
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def create(args = nil) loggerdebug "We have just created a new WidgetWorker!" end def create_new_widget(options = {}) loggerdebug "We need to create a new widget: #{optionsinspect}" widget = Widgetcreate(options) loggerdebug "We created widget: #{optionsinspect}" end end
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We have created our worker class, WidgetWorker, which will handle the offline, asynchronous creation of our new widgets But how do we call this code and tell it to do just that We must change the create action in the WidgetsController class We should update it to look like this:
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def create widget_worker = MiddleManworker(:widget_worker) result = widget_workerasync_create_new_widget(:arg => params[:widget]) if result == 'ok' msg = 'We are creating your widget Please check back shortly' flash[:notice] = msg redirect_to(widgets_url) else @widget = Widgetnew(params[:widget]) msg = 'There was an error creating your widget Please try again later' flash[:error] = msg render(:action => 'new') end end
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This is quite a big change from our original create action Let s work through it so that you understand what is happening First we make a call to that mysterious MiddleMan class I referred to earlier The MiddleMan class does just what its name says it acts as a middleman between your application and the BackgrounDRb server
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Without it you would have to write a lot of code to make those connections On the MiddleMan class we call the worker method and pass it the name of the worker we are looking for In our case we are looking for :widget_worker The worker method looks up a reference to our WidgetWorker and returns it to us so that we can interact with it With that said, we don t get back an actual instance of our worker class Instead, we get a proxy class that mimics the worker class If we were to call the inspect method on our widget_worker variable, we would see something like the following:
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#<BackgrounDRb::RailsWorkerProxy:0x1f2a23c @middle_man=#<BackgrounDRb::ClusterConnection:0x2323c58 @backend_connections=[#<BackgrounDRb::Connection:0x22f0d08 @mutex=#<Mutex:0x22f0c04>, @cluster_conn=#<BackgrounDRb::ClusterConnection:0x2323c58 >, @server_port=11006, @connection=nil, @server_ip="0000", @connection_status=true>], @request_count=31, @bdrb_servers=[#<struct #<Class:0x22f135c> ip="0000", port=11006>], @round_robin=[], @last_polled_time=Wed Jul 15 22:32:33 -0400 2009, @disconnected_connections={}>, @worker_name=:widget_worker, @worker_key=nil, @tried_connections=[]>
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We are actually returned an instance of a class called BackgrounDRb:: RailsWorkerProxy and not WidgetWorker, as you might have thought It is on this proxy that we will register a call to our create_new_widget method, passing in the Hash that represents the widget we want created This proxy then generates a message and places it on a queue over DRb so that a background process can pop that message off the queue and process it for us We create that message like this:
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result = widget_workerasync_create_new_widget(:arg => params[:widget])
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What Happens if No Worker Exists
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We have seen that when we call the worker method on the MiddleMan class, we are returned a BackgrounDRb:: RailsWorkerProxy instance and not an instance of the actual worker class we have written What happens if the worker we request does not exist Let s see
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First, let s try to find a worker that does not exist:
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ww = MiddleManworker(:i_do_not_exist)
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This returns successfully We get another instance of BackgrounDRb::RailsWorkerProxy I would have expected this to either return nil or raise an exception, but it doesn t The reason, as I understand it, is that the background process that is performing the tasks may or may not have the worker the application is requesting The only way to find out is to make a remote method call and ask But because that is somewhat expensive, it is just assumed that the worker you requested exists If we print the inspect method on our nonexistent worker, we see that it looks similar to the worker we retrieved earlier in the chapter:
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#<BackgrounDRb::RailsWorkerProxy:0x1f40384 @middle_man=#<BackgrounDRb::ClusterConnection: 0x2323c58 @backend_connections=[#<BackgrounDRb:: Connection:0x22f0d08 @mutex=#<Mutex:0x22f0c04>, @cluster_conn=#<BackgrounDRb::ClusterConnection: 0x2323c58 >, @server_port=11006, @server_ip="0000", @connection_status=true>], @request_count=1, @bdrb_servers=[#<struct #<Class:0x22f135c> ip="0000", port=11006>], @round_robin=[0], @last_polled_time=Wed Jul 15 23:28:30 -0400 2009, @disconnected_connections={}>, @worker_name=:i_do_not_exist, @worker_key=nil, @tried_connections=[]>
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If we were to try to call a method on our nonexistent worker, we would be returned a nil instead of our successful status of ok The moral of this story is to always be sure to check the return status and handle it appropriately
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