From e4320858ef6ae3b69fc5506c9d86cc7aa1878602 Mon Sep 17 00:00:00 2001
From: David Genord II <david@collectiveidea.com>
Date: Fri, 3 Oct 2014 17:27:12 -0400
Subject: [PATCH] A limited attempt at automatic code reloading

If ActionDispatch::Reloader is available, introduced in Rails 3.1, we can use that to trigger the standard rails code reloading.
---
 lib/delayed/worker.rb | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/lib/delayed/worker.rb b/lib/delayed/worker.rb
index 3453c12d9..925c65e33 100644
--- a/lib/delayed/worker.rb
+++ b/lib/delayed/worker.rb
@@ -100,6 +100,10 @@ def self.lifecycle
       @lifecycle ||= Delayed::Lifecycle.new
     end
 
+    def self.reload_app?
+      defined?(ActionDispatch::Reloader) && Rails.application.config.cache_classes == false
+    end
+
     def initialize(options = {})
       @quiet = options.key?(:quiet) ? options[:quiet] : true
       @failed_reserve_count = 0
@@ -155,6 +159,7 @@ def start # rubocop:disable CyclomaticComplexity, PerceivedComplexity
               break
             elsif !stop?
               sleep(self.class.sleep_delay)
+              reload!
             end
           else
             say format("#{count} jobs processed at %.4f j/s, %d failed", count / @realtime, @result.last)
@@ -286,5 +291,11 @@ def reserve_job
       raise FatalBackendError if @failed_reserve_count >= 10
       nil
     end
+
+    def reload!
+      return unless self.class.reload_app?
+      ActionDispatch::Reloader.cleanup!
+      ActionDispatch::Reloader.prepare!
+    end
   end
 end