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Versions: 41

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Contents

class Module
  # Synchronize access around a method, delegating synchronization to a
  # particular mutex. A mutex (either a Mutex, or any object that responds to 
  # #synchronize and yields to a block) must be provided as a final :with option.
  # The :with option should be a symbol or string, and can represent a method, 
  # constant, or instance or class variable.
  # Example:
  #   class SharedCache
  #     @@lock = Mutex.new
  #     def expire
  #       ...
  #     end
  #     synchronize :expire, :with => :@@lock
  #   end
  def synchronize(*methods)
    options = methods.extract_options!
    unless options.is_a?(Hash) && with = options[:with]
      raise ArgumentError, "Synchronization needs a mutex. Supply an options hash with a :with key as the last argument (e.g. synchronize :hello, :with => :@mutex)."
    end

    methods.each do |method|
      aliased_method, punctuation = method.to_s.sub(/([?!=])$/, ''), $1

      if method_defined?("#{aliased_method}_without_synchronization#{punctuation}")
        raise ArgumentError, "#{method} is already synchronized. Double synchronization is not currently supported."
      end

      module_eval(<<-EOS, __FILE__, __LINE__)
        def #{aliased_method}_with_synchronization#{punctuation}(*args, &block)     # def expire_with_synchronization(*args, &block)
          #{with}.synchronize do                                                    #   @@lock.synchronize do
            #{aliased_method}_without_synchronization#{punctuation}(*args, &block)  #     expire_without_synchronization(*args, &block)
          end                                                                       #   end
        end                                                                         # end
      EOS

      alias_method_chain method, :synchronization
    end
  end
end

Version data entries

41 entries across 40 versions & 10 rubygems

Version Path
activesupport_csi-2.3.5.p8 lib/active_support/core_ext/module/synchronization.rb
activesupport_csi-2.3.5.p7 lib/active_support/core_ext/module/synchronization.rb
activesupport_csi-2.3.5.p6 lib/active_support/core_ext/module/synchronization.rb
webroar-0.5.0 src/admin_panel/vendor/rails/activesupport/lib/active_support/core_ext/module/synchronization.rb
radiantcms-couchrest_model-0.2.4 vendor/rails/activesupport/lib/active_support/core_ext/module/synchronization.rb
radiantcms-couchrest_model-0.2.2 vendor/rails/activesupport/lib/active_support/core_ext/module/synchronization.rb
radiantcms-couchrest_model-0.2.1 vendor/rails/activesupport/lib/active_support/core_ext/module/synchronization.rb
radiantcms-couchrest_model-0.2 vendor/rails/activesupport/lib/active_support/core_ext/module/synchronization.rb
radiantcms-couchrest_model-0.1.9 vendor/rails/activesupport/lib/active_support/core_ext/module/synchronization.rb
radiantcms-couchrest_model-0.1.8 vendor/rails/activesupport/lib/active_support/core_ext/module/synchronization.rb
radiantcms-couchrest_model-0.1.7 vendor/rails/activesupport/lib/active_support/core_ext/module/synchronization.rb
radiantcms-couchrest_model-0.1.6 vendor/rails/activesupport/lib/active_support/core_ext/module/synchronization.rb
radiantcms-couchrest_model-0.1.5 vendor/rails/activesupport/lib/active_support/core_ext/module/synchronization.rb
webroar-0.4.0 src/admin_panel/vendor/rails/activesupport/lib/active_support/core_ext/module/synchronization.rb
radiant-0.8.2 vendor/rails/activesupport/lib/active_support/core_ext/module/synchronization.rb
radiant-0.9.0.rc2 vendor/rails/activesupport/lib/active_support/core_ext/module/synchronization.rb
webroar-0.3.1 src/admin_panel/vendor/rails/activesupport/lib/active_support/core_ext/module/synchronization.rb
webroar-0.3.0 src/admin_panel/vendor/rails/activesupport/lib/active_support/core_ext/module/synchronization.rb
usher-0.7.0 spec/rails2_3/vendor/rails/vendor/rails/activesupport/pkg/activesupport-2.3.3/lib/active_support/core_ext/module/synchronization.rb
usher-0.7.0 spec/rails2_3/vendor/rails/vendor/rails/activesupport/lib/active_support/core_ext/module/synchronization.rb