Class: ActionDispatch::ServerTiming::Subscriber

Inherits:
Object
  • Object
show all
Includes:
Singleton
Defined in:
lib/action_dispatch/middleware/server_timing.rb

Overview

:nodoc:

Constant Summary collapse

KEY = 
:action_dispatch_server_timing_events

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Subscriber

Returns a new instance of Subscriber.



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# File 'lib/action_dispatch/middleware/server_timing.rb', line 13

def initialize
  @mutex = Mutex.new
end

Instance Method Details

#call(event) ⇒ Object 



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# File 'lib/action_dispatch/middleware/server_timing.rb', line 17

def call(event)
  if events = ActiveSupport::IsolatedExecutionState[KEY]
    events << event
  end
end

#collect_events ⇒ Object 



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# File 'lib/action_dispatch/middleware/server_timing.rb', line 23

def collect_events
  events = []
  ActiveSupport::IsolatedExecutionState[KEY] = events
  yield
  events
ensure
  ActiveSupport::IsolatedExecutionState.delete(KEY)
end

#ensure_subscribed ⇒ Object 



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# File 'lib/action_dispatch/middleware/server_timing.rb', line 32

def ensure_subscribed
  @mutex.synchronize do
    # Subscribe to all events, except those beginning with "!"
    # Ideally we would be more selective of what is being measured
    @subscriber ||= ActiveSupport::Notifications.subscribe(/\A[^!]/, self)
  end
end

#unsubscribe ⇒ Object 



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# File 'lib/action_dispatch/middleware/server_timing.rb', line 40

def unsubscribe
  @mutex.synchronize do
    ActiveSupport::Notifications.unsubscribe @subscriber
    @subscriber = nil
  end
end