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Class: ActiveSupport::Callbacks::CallbackChain

Relationships & Source Files
Super Chains via Extension / Inclusion / Inheritance
Instance Chain:
self, ::Enumerable
Inherits: Object
Defined in: activesupport/lib/active_support/callbacks.rb

Overview

An Array with a compile method.

Class Method Summary

Instance Attribute Summary

::Enumerable - Included

#many?

Returns true if the enumerable has more than 1 element.

Instance Method Summary

::Enumerable - Included

#exclude?

The negative of the Enumerable#include?.
#index_by

Convert an enumerable to a hash.
#sum

Calculates a sum from the elements.

Constructor Details

.new(name, config) ⇒ CallbackChain

[ GitHub ] 

  


# File 'activesupport/lib/active_support/callbacks.rb', line 517



def initialize(name, config)
  @name = name
  @config = {
    :scope => [ :kind ]
  }.merge!(config)
  @chain = []
  @callbacks = nil
  @mutex = Mutex.new
end


  







Instance Attribute Details



  

    #config   (readonly)
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/callbacks.rb', line 515



attr_reader :name, :config


  








  

    #empty?  ⇒ Boolean  (readonly)
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/callbacks.rb', line 529



def empty?;       @chain.empty?; end


  








  

    #name   (readonly)
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/callbacks.rb', line 515



attr_reader :name, :config


  







Instance Method Details



  

    #append(*callbacks)  
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/callbacks.rb', line 562



def append(*callbacks)
  callbacks.each { |c| append_one(c) }
end


  








  

    #clear  
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/callbacks.rb', line 541



def clear
  @callbacks = nil
  @chain.clear
  self
end


  








  

    #compile  
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/callbacks.rb', line 553



def compile
  @callbacks || @mutex.synchronize do
    final_sequence = CallbackSequence.new { |env| Filters::ENDING.call(env) }
    @callbacks ||= @chain.reverse.inject(final_sequence) do |callback_sequence, callback|
      callback.apply callback_sequence
    end
  end
end


  








  

    #delete(o)  
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/callbacks.rb', line 536



def delete(o)
  @callbacks = nil
  @chain.delete(o)
end


  








  

    #each(&block)  
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/callbacks.rb', line 527



def each(&block); @chain.each(&block); end


  








  

    #index(o)  
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/callbacks.rb', line 528



def index(o);     @chain.index(o); end


  








  

    #initialize_copy(other)  
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/callbacks.rb', line 547



def initialize_copy(other)
  @callbacks = nil
  @chain     = other.chain.dup
  @mutex     = Mutex.new
end


  








  

    #insert(index, o)  
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/callbacks.rb', line 531



def insert(index, o)
  @callbacks = nil
  @chain.insert(index, o)
end


  








  

    #prepend(*callbacks)  
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/callbacks.rb', line 566



def prepend(*callbacks)
  callbacks.each { |c| prepend_one(c) }
end