instance method `synchronize`

Ruby on Rails 3.2.22.5

Since v2.2.3 Last seen in v3.2.22.5

Available in: v2.2.3 v2.3.18 v3.0.20 v3.1.12 v3.2.22.5

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synchronize(*methods)

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

Parameters

methods rest

Source

# File activesupport/lib/active_support/core_ext/module/synchronization.rb, line 20
  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__ + 1)
        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

Defined in activesupport/lib/active_support/core_ext/module/synchronization.rb line 20 · View on GitHub · Improve this page · Find usages on GitHub

Defined in Module

Signature

Parameters