# This module can be included on a class to make all method-calls synchronized (by using monitor). Examples with array and hash are below.
#
#===Examples
#  class MySyncedClass < SomeOtherClassThatNeedsToBeSynchronized
#    include Tsafe::Monitored
#  end
module Tsafe::Monitored
  def self.included(base)
    base.to_s.split("::").inject(Object, :const_get).class_eval do
      instance_methods.each do |method_name|
        # These two methods create warnings under JRuby.
        if RUBY_ENGINE == "jruby"
          next if method_name == :instance_exec || method_name == :instance_eval
        end

        new_method_name = "_ts_#{method_name}"
        alias_method(new_method_name, method_name)

        define_method method_name do |*args, &block|
          # Need to use monitor, since the internal calls might have to run not-synchronized, and we have just overwritten the internal methods.
          @_ts_mutex = Monitor.new unless @_ts_mutex
          @_ts_mutex.synchronize do
            return _ts___send__(new_method_name, *args, &block)
          end
        end
      end
    end
  end
end
