Module: SuperCallbacks::ClassAndInstanceMethods

Defined in:
lib/super_callbacks/class_and_instance_methods.rb

Overview

The methods defined here will be available “class” and “instance” for any class where SuperCallbacks is included

Instance Method Summary collapse

Instance Method Details

#after(method_name, callback_method_name = nil, options = {}, &callback_proc) ⇒ Object 



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# File 'lib/super_callbacks/class_and_instance_methods.rb', line 70

def after(method_name, callback_method_name = nil, options = {}, &callback_proc)
  callback_method_name_or_proc = callback_proc || callback_method_name
  unless [Symbol, String, Proc].include? callback_method_name_or_proc.class
    raise ArgumentError, "Only `Symbol`, `String` or `Proc` allowed for `method_name`, but is #{callback_method_name_or_proc.class}"
  end

  invalid_option_keys = options.keys - VALID_OPTION_KEYS
  unless invalid_option_keys.empty?
    raise ArgumentError, "Invalid `options` keys: #{invalid_option_keys}. Valid are only: #{VALID_OPTION_KEYS}"
  end
  if options[:if] && ![Symbol, String, Proc].include?(options[:if].class)
    raise ArgumentError, "Only `Symbol`, `String` or `Proc` allowed for `options[:if]`, but is #{options[:if].class}"
  end

  self.after_callbacks ||= {}
  self.after_callbacks[method_name.to_sym] ||= []
  self.after_callbacks[method_name.to_sym] << [callback_method_name_or_proc, options[:if]]

  super_callbacks_prepended = self.super_callbacks_prepended

  # dont redefine, to save cpu cycles
  unless super_callbacks_prepended.instance_methods(false).include? method_name
    super_callbacks_prepended.send(:define_method, method_name) do |*args|
      return super(*args) if self.class.super_callbacks_prepended != super_callbacks_prepended

      begin
        # refactored to use Thread.current for thread-safetiness
        Thread.current[:super_callbacks_all_instance_variables_before_change] ||= {}
        Thread.current[:super_callbacks_all_instance_variables_before_change][object_id] ||= []

        all_instance_variables_before_change = instance_variables.each_with_object({}) do |instance_variable, hash|
          hash[instance_variable] = instance_variable_get(instance_variable)
        end

        Thread.current[:super_callbacks_all_instance_variables_before_change][object_id] << all_instance_variables_before_change

        run_before_callbacks(method_name, *args)
        super_value = super(*args)
        run_after_callbacks(method_name, *args)
      ensure
        Thread.current[:super_callbacks_all_instance_variables_before_change][object_id].pop

        if Thread.current[:super_callbacks_all_instance_variables_before_change][object_id].empty?
          Thread.current[:super_callbacks_all_instance_variables_before_change].delete(object_id)
        end

        if Thread.current[:super_callbacks_all_instance_variables_before_change].empty?
          Thread.current[:super_callbacks_all_instance_variables_before_change] = nil
        end
      end

      super_value
    end
  end
end

#after!(method_name, *remaining_args, &callback_proc) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/super_callbacks/class_and_instance_methods.rb', line 9

def after!(method_name, *remaining_args, &callback_proc)
  raise ArgumentError, "`#{method_name}` is not or not yet defined for #{self}" unless method_defined? method_name
  after(method_name, *remaining_args, &callback_proc)
end

#before(method_name, callback_method_name = nil, options = {}, &callback_proc) ⇒ Object 



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# File 'lib/super_callbacks/class_and_instance_methods.rb', line 14

def before(method_name, callback_method_name = nil, options = {}, &callback_proc)
  callback_method_name_or_proc = callback_proc || callback_method_name
  unless [Symbol, String, Proc].any? { |klass| callback_method_name_or_proc.is_a? klass }
    raise ArgumentError, "Only `Symbol`, `String` or `Proc` allowed for `method_name`, but is #{callback_method_name_or_proc.class}"
  end

  invalid_option_keys = options.keys - VALID_OPTION_KEYS
  unless invalid_option_keys.empty?
    raise ArgumentError, "Invalid `options` keys: #{invalid_option_keys}. Valid are only: #{VALID_OPTION_KEYS}"
  end
  if options[:if] && !([Symbol, String, Proc].any? { |klass| callback_method_name_or_proc.is_a? klass })
    raise ArgumentError, "Only `Symbol`, `String` or `Proc` allowed for `options[:if]`, but is #{options[:if].class}"
  end

  self.before_callbacks ||= {}
  self.before_callbacks[method_name.to_sym] ||= []
  self.before_callbacks[method_name.to_sym] << [callback_method_name_or_proc, options[:if]]

  super_callbacks_prepended = self.super_callbacks_prepended

  # dont redefine, to save cpu cycles
  unless super_callbacks_prepended.instance_methods(false).include? method_name
    super_callbacks_prepended.send(:define_method, method_name) do |*args|
      return super(*args) if self.class.super_callbacks_prepended != super_callbacks_prepended

      begin
        # refactored to use Thread.current for thread-safetiness
        Thread.current[:super_callbacks_all_instance_variables_before_change] ||= {}
        Thread.current[:super_callbacks_all_instance_variables_before_change][object_id] ||= []

        all_instance_variables_before_change = instance_variables.each_with_object({}) do |instance_variable, hash|
          hash[instance_variable] = instance_variable_get(instance_variable)
        end

        Thread.current[:super_callbacks_all_instance_variables_before_change][object_id] << all_instance_variables_before_change

        run_before_callbacks(method_name, *args)
        super_value = super(*args)
        run_after_callbacks(method_name, *args)
      ensure
        Thread.current[:super_callbacks_all_instance_variables_before_change][object_id].pop

        if Thread.current[:super_callbacks_all_instance_variables_before_change][object_id].empty?
          Thread.current[:super_callbacks_all_instance_variables_before_change].delete(object_id)
        end

        if Thread.current[:super_callbacks_all_instance_variables_before_change].empty?
          Thread.current[:super_callbacks_all_instance_variables_before_change] = nil
        end
      end

      super_value
    end
  end
end

#before!(method_name, *remaining_args, &callback_proc) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/super_callbacks/class_and_instance_methods.rb', line 4

def before!(method_name, *remaining_args, &callback_proc)
  raise ArgumentError, "`#{method_name}` is not or not yet defined for #{self}" unless method_defined? method_name
  before(method_name, *remaining_args, &callback_proc)
end

#instance_variable_before_change(instance_variable) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/super_callbacks/class_and_instance_methods.rb', line 131

def instance_variable_before_change(instance_variable)
  raise 'You cannot call this method outside the SuperCallbacks cycle' if Thread.current[:super_callbacks_all_instance_variables_before_change].nil?
  raise ArgumentError, "#{instance_variable} should be a string that starts with `@`" unless instance_variable.to_s.start_with? '@'
  instance_variables_before_change[instance_variable.to_sym]
end

#instance_variable_changed?(instance_variable) ⇒ Boolean

Returns:

  • (Boolean)

Raises:

  • (ArgumentError) 


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# File 'lib/super_callbacks/class_and_instance_methods.rb', line 137

def instance_variable_changed?(instance_variable)
  raise 'You cannot call this method outside the SuperCallbacks cycle' if Thread.current[:super_callbacks_all_instance_variables_before_change].nil?
  raise ArgumentError, "#{instance_variable} should be a string that starts with `@`" unless instance_variable.to_s.start_with? '@'

  before_change_value = instance_variable_before_change(instance_variable.to_sym)
  current_value = instance_variable_get(instance_variable)
  before_change_value != current_value
end

#instance_variables_before_change ⇒ Object 



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# File 'lib/super_callbacks/class_and_instance_methods.rb', line 126

def instance_variables_before_change
  raise 'You cannot call this method outside the SuperCallbacks cycle' if Thread.current[:super_callbacks_all_instance_variables_before_change].nil?
  Thread.current[:super_callbacks_all_instance_variables_before_change][object_id].last
end