Module: Tsafe::Mrswlock_synmodule

Included in:
MonArray, MonHash
Defined in:
lib/tsafe_mrswlock_synmodule.rb

Overview

This module can be included in order to painlessly make a thread-safe multi-reader-single-writer thread-safe copy of a class.

Examples

class Tsafe::MonHash < ::Hash
  @@tsafe_mrswlock_w_methods = [:[]=, :clear, :delete, :delete_if, :keep_if, :merge!, :rehash, :reject!, :replace, :select!, :shift, :store, :update, :values_at]
  @@tsafe_mrswlock_r_methods = [:each, :each_key, :each_pair, :each_value]
  include Tsafe::Mrswlock::SynModule
end

Class Method Summary collapse

Class Method Details

.included(base) ⇒ Object


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# File 'lib/tsafe_mrswlock_synmodule.rb', line 9

def self.included(base)
  base.to_s.split("::").inject(Object, :const_get).class_eval do
    #Yields the given block within the read-lock.
    #===Examples
    # obj._tsafe_rsync do
    #   #do something within read-lock.
    # end
    def _tsafe_rsync(&block)
      @tsafe_mrswlock.rsync(&block)
    end
    
    #Yields the given block within the write-lock (and read-lock).
    #===Examples
    # obj._tsafe_wsync do
    #   #do something within write-lock.
    # end
    def _tsafe_wsync(&block)
      @tsafe_mrswlock.rsync(&block)
    end
    
    #Rename initialize.
    alias_method(:initialize_mrswlock, :initialize)
    
    #Make another initialize-method that spawns the lock and then calls the original initialize.
    define_method(:initialize) do |*args, &block|
      @tsafe_mrswlock = Tsafe::Mrswlock.new
      return initialize_mrswlock(*args, &block)
    end
    
    #Makes reader methods go through reader-lock.
    base.class_variable_get(:@@tsafe_mrswlock_r_methods).each do |mname|
      newmname = "tsafe_mrswlock_#{mname}".to_sym
      alias_method(newmname, mname)
      
      define_method(mname) do |*args, &block|
        @tsafe_mrswlock.rsync do
          return self.__send__(newmname, *args, &block)
        end
      end
    end
    
    #Makes writer methods go through writer-lock.
    base.class_variable_get(:@@tsafe_mrswlock_w_methods).each do |mname|
      newmname = "tsafe_mrswlock_#{mname}".to_sym
      alias_method(newmname, mname)
      
      define_method(mname) do |*args, &block|
        @tsafe_mrswlock.wsync do
          return self.__send__(newmname, *args, &block)
        end
      end
    end
  end
end