Class: ScoutApm::Instruments::ActionView

Inherits:
Object
  • Object
show all
Defined in:
lib/scout_apm/instruments/action_view.rb

Defined Under Namespace

Modules: ActionViewPartialRendererInstruments, ActionViewTemplateRendererInstruments

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(context) ⇒ ActionView

Returns a new instance of ActionView.



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# File 'lib/scout_apm/instruments/action_view.rb', line 15

def initialize(context)
  @context = context
  @installed = false
end

Instance Attribute Details

#context ⇒ Object (readonly)

Returns the value of attribute context.



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# File 'lib/scout_apm/instruments/action_view.rb', line 13

def context
  @context
end

Instance Method Details

#install ⇒ Object 



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# File 'lib/scout_apm/instruments/action_view.rb', line 32

def install
  return unless defined?(::ActionView) && defined?(::ActionView::PartialRenderer)

  if prependable?
    install_using_prepend
  else
    install_using_tracer
  end
  @installed = true
end

#install_using_prepend ⇒ Object 



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# File 'lib/scout_apm/instruments/action_view.rb', line 69

def install_using_prepend
  logger.info "Instrumenting ActionView::PartialRenderer"
  ::ActionView::PartialRenderer.prepend(ActionViewPartialRendererInstruments)

  logger.info "Instrumenting ActionView::TemplateRenderer"
  ::ActionView::TemplateRenderer.prepend(ActionViewTemplateRendererInstruments)
end

#install_using_tracer ⇒ Object 



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# File 'lib/scout_apm/instruments/action_view.rb', line 43

def install_using_tracer
  logger.info "Instrumenting ActionView::PartialRenderer"
  ::ActionView::PartialRenderer.class_eval do
    include ScoutApm::Tracer

    instrument_method :render_partial,
      :type => "View",
      :name => '#{@template.virtual_path rescue "Unknown Partial"}/Rendering',
      :scope => true

    instrument_method :collection_with_template,
      :type => "View",
      :name => '#{@template.virtual_path rescue "Unknown Collection"}/Rendering',
      :scope => true
  end

  logger.info "Instrumenting ActionView::TemplateRenderer"
  ::ActionView::TemplateRenderer.class_eval do
    include ScoutApm::Tracer
    instrument_method :render_template,
      :type => "View",
      :name => '#{args[0].virtual_path rescue "Unknown"}/Rendering',
      :scope => true
  end
end

#installed? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/scout_apm/instruments/action_view.rb', line 24

def installed?
  @installed
end

#logger ⇒ Object 



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# File 'lib/scout_apm/instruments/action_view.rb', line 20

def logger
  context.logger
end

#prependable? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/scout_apm/instruments/action_view.rb', line 28

def prependable?
  context.environment.supports_module_prepend?
end