Class: Rack::SpeedTracer::Tracer

Inherits:
TraceRecord show all
Defined in:
lib/rack/speedtracer/tracer.rb

Instance Method Summary collapse

Constructor Details

#initialize(id, method, uri) ⇒ Tracer

Returns a new instance of Tracer.



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# File 'lib/rack/speedtracer/tracer.rb', line 55

def initialize(id, method, uri)
  super(id)

  @method = method
  @uri = uri
  @event_id = 0
  @pstack = []
end

Instance Method Details

#finish ⇒ Object 



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# File 'lib/rack/speedtracer/tracer.rb', line 99

def finish
  super()

  Yajl::Encoder.encode({
    'trace' =>  {
      'date' =>  @start.to_i,
      'application' => 'Rack SpeedTracer',
      'range' =>  range(@start, @finish),
      'id' =>  @id,
      'frameStack' =>  {
        'range' =>  range(@start, @finish),
        'id' =>  '0',
        'operation' =>  {
          'type' =>  'HTTP',
          'label' =>  [@method, @uri].join(' ')
        },
        'children' =>  @children
      }
    }
  })
end

#run(name = '', &blk) ⇒ Object 



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# File 'lib/rack/speedtracer/tracer.rb', line 64

def run(name = '', &blk)
  file, line, method = caller.first.split(':')
  method = method.gsub(/^in|[^\w]+/, '') if method

  # SpeedTracer allows us to nest events via child relationships,
  # which means that we can use a stack to keep track of the currently
  # executing events to produce a proper execution tree.
  #
  # Example execution graph:
  #
  # root
  # -- event 1
  #    ---- event 2
  # -- event 3
  #    ----- event 4
  #    ----- event 5
  #         ------ event 6
  #

  @event_id += 1
  event = ServerEvent.new(@event_id, file, line, method, name)
  @pstack.push event

  blk.call      # execute the provided code block
  event.finish  # finalize current event timers
  @pstack.pop   # pop current event from parent stack

  if parent = @pstack.last
    parent.children.push event
  else
    # no parent, means this is a child of root node
    @children.push event
  end
end