thread safety - Is this async Rails action safe? -

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I am trying to do asynchronous and non-blocking a rail action. I am using Rail 3.2 and thin web server. Is the following code safe? 

  Class AnalyticsController & lt; ApplicationController # [...] # When displaying a XHR request, def loads a spinner in the main page while loading the load. Nue do @answer = Analytic.build_stuff_with_blocking_io # can take up to 60sec request.env ['async.callback'] .col [200, {}, render_to_string (partial: '/ analytics / dashboard', layout: incorrect)] End throw: async end end  
 
 Here's an example of how to perform async rail:  
  class ApplicationController & lt; ActionController :: Base Def async EM.defer do sleep 5 # Some tasks that take long call.env ['async.callback']. Throw the call response end: async end end  
 
 Be sure that you have  config.allow_concurrency = true  in your environment 
 
 if you tap Using: 
 
  Bundle Excel Thin - Started Start  
 
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