def close(thread_name)
      close_callback = @close_callbacks[thread_name]
      close_callback.call if close_callback
      true
    ensure
      @auditors[thread_name] = nil
      @close_callbacks[thread_name] = nil
    end
def close(thread_name)
      close_callback = @close_callbacks[thread_name]
      close_callback.call if close_callback
      true
    ensure
      @auditors[thread_name] = nil
      @close_callbacks[thread_name] = nil
    end
Reset proxy object and notify close event listener

 === Parameters
 thread_name(String):: execution thread name or default

 === Return
 true:: Always return true