make_silence_stream_thread_safe.rb

require 'active_support/core_ext/kernel/reporting'
require 'active_support/core_ext/module/aliasing'
require 'monitor'

# This is my variation on Tom Meier's monkey-patch to fix a problem in Rails
# I've run into with RSpec. I've tweaked it a bit to use `alias_method_chain`
# instead of just overloading the original method and copying its code.
#
# See the original Gist here:
#
#   https://gist.github.com/tommeier/9845210
#
# Here are Tom Meier's notes on the problem:
#
#   Monkey patch silence_stream to be thread safe
#   -> Pull request on Rails: https://github.com/rails/rails/pull/13139
#   -> But this will allow us to continue to see log output when running specs
#   -> It could be we just patch ActiveRecord::SessionStore that triggers the `.quietly` calls
#      on logging the `find_session_id` calls.

module Kernel

  def silence_stream_with_monitor(stream, &block)
    @@monitor ||= Monitor.new

    @@monitor.synchronize do
      silence_stream_without_monitor(stream, &block)
    end
  end

  alias_method_chain :silence_stream, :monitor

end