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Class: ActiveSupport::Notifications::Instrumenter

Relationships & Source Files
Inherits: Object
Defined in: activesupport/lib/active_support/notifications/instrumenter.rb

Overview

Instrumenters are stored in a thread local.

Class Method Summary

Instance Attribute Summary

Instance Method Summary

Constructor Details

.new(notifier) ⇒ Instrumenter

[ GitHub ] 

  


# File 'activesupport/lib/active_support/notifications/instrumenter.rb', line 12



def initialize(notifier)
  unless notifier.respond_to?(:build_handle)
    notifier = LegacyHandle::Wrapper.new(notifier)
  end

  @id       = unique_id
  @notifier = notifier
end


  







Instance Attribute Details



  

    #id   (readonly)
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/notifications/instrumenter.rb', line 10



attr_reader :id


  







Instance Method Details



  

    #build_handle(name, payload)  
  



  

    

Returns a “handle” for an event with the given name and payload.



#start and #finish must each be called exactly once on the returned object.



Where possible, it’s best to use #instrument, which will record the start and finish of the event and correctly handle any exceptions. build_handle is a low-level API intended for cases where using #instrument isn’t possible.



See Fanout::Handle.


  



  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/notifications/instrumenter.rb', line 78



def build_handle(name, payload)
  @notifier.build_handle(name, @id, payload)
end


  








  

    #finish(name, payload)  
  



  

    

Send a finish notification with name and payload.


  



  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/notifications/instrumenter.rb', line 92



def finish(name, payload)
  @notifier.finish name, @id, payload
end


  








  

    #finish_with_state(listeners_state, name, payload)  
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/notifications/instrumenter.rb', line 96



def finish_with_state(listeners_state, name, payload)
  @notifier.finish name, @id, payload, listeners_state
end


  








  

    #instrument(name, payload = {})  
  



  

    

Given a block, instrument it by measuring the time taken to execute and publish it. Without a block, simply send a message via the notifier. Notice that events get sent even if an error occurs in the passed-in block.


  



  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/notifications/instrumenter.rb', line 54



def instrument(name, payload = {})
  handle = build_handle(name, payload)
  handle.start
  begin
    yield payload if block_given?
  rescue Exception => e
    payload[:exception] = [e.class.name, e.message]
    payload[:exception_object] = e
    raise e
  ensure
    handle.finish
  end
end


  








  

    #start(name, payload)  
  



  

    

Send a start notification with name and payload.


  



  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/notifications/instrumenter.rb', line 87



def start(name, payload)
  @notifier.start name, @id, payload
end