Instrumentable

-note, this version is not backwards compatiable

Decorate all your favorite methods with ActiveSupport::Notifications.instrument

This gem allows you to wrap methods on your classes for use with AS::N without having to put AS::N.instrument do blocks around everything. You can customize the payload sent with the event, and in addition all of the method args(if any) are sent as well

Add this line to your application's Gemfile:

gem "instrumentable", "~> 1.1.0"

And then execute:

$ bundle

Or install it yourself as:

$ gem install instrumentable

include the gem in your class

include Instrumentable

to instrument an instance method

instrument_method :method_name, 'event.to.fire', :payload_key => :payload_value

:method_name

Is the name of the method you want to instrument

'event.to.fire'

Is the name of the event you'll setup your subscriber for This can be any string

:payload_key => :payload_value

The last part is the payload, which consists of a key and a value. What is sent to the subscriber depends on what is passed in as the value

• String
  • ex: 'static_string'
  • string is passed in as-is to the payload
• Symbol
  • ex: :method_name
  • calls symbol as a method on the class in the current context (class, intance)
• Proc
  • ex: Proc.new { Time.now }
  • calls the proc, returning the value

All payloads will recieve a list of the arguments called with the method under :_method_args, this will be an empty array if the method was called with no args

If you want to instrument a class method, you must use a separate method

class_instrument_method  self, :method_name, 'event.to.fire', :payload_key => :payload_value

You must use class_instrument_method instead and pass the first argument in as self

require "instrumentable"

class WidgetRenderer
  include Instrumentable

  attr_reader :id, :name

  def render
    # do crazy render here
  end 

  def load(options)
    # make call here
  end

  def self.add(location)
    # ...
  end

  private
  def valid?
    # returns if call is valid
  end
  instrument_method :render, 'render.widget', :widget_id => :id, :widget_name => :name
  instrument_method :load, 'load.widget', :status => 'loading', :valid => :valid?
  class_instrument_method :add, 'add.widget'
end

• ActiveSupport

rake test

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request