ActiveJob: Implemented enqueue_at for QueueClassic

3 files changed, 46 insertions, 14 deletions

diff --git a/activejob/lib/active_job/queue_adapters/queue_classic_adapter.rb b/activejob/lib/active_job/queue_adapters/queue_classic_adapter.rb
index d74f8cf90e..914390a958 100644
--- a/activejob/lib/active_job/queue_adapters/queue_classic_adapter.rb
+++ b/activejob/lib/active_job/queue_adapters/queue_classic_adapter.rb
@@ -5,11 +5,26 @@ module ActiveJob
     class QueueClassicAdapter
       class << self
         def enqueue(job, *args)
-          QC::Queue.new(job.queue_name).enqueue("#{JobWrapper.name}.perform", job.name, *args)
+          build_queue(job.queue_name).enqueue("#{JobWrapper.name}.perform", job.name, *args)
         end
 
         def enqueue_at(job, timestamp, *args)
-          raise NotImplementedError
+          queue = build_queue(job.queue_name)
+          unless queue.respond_to?(:enqueue_at)
+            raise NotImplementedError, 'To be able to schedule jobs with Queue Classic ' \
+              'the QC::Queue needs to respond to `enqueue_at(timestamp, method, *args)`. '
+              'You can implement this yourself or you can use the queue_classic-later gem.'
+          end
+          queue.enqueue_at(timestamp, "#{JobWrapper.name}.perform", job.name, *args)
+        end
+
+        # Builds a <tt>QC::Queue</tt> object to schedule jobs on.
+        #
+        # If you have a custom <tt>QC::Queue</tt> subclass you'll need to suclass
+        # <tt>ActiveJob::QueueAdapters::QueueClassicAdapter</tt> and override the
+        # <tt>build_queue</tt> method.
+        def build_queue(queue_name)
+          QC::Queue.new(queue_name)
         end
       end
 
diff --git a/activejob/test/support/queue_classic/inline.rb b/activejob/test/support/queue_classic/inline.rb
index 5e9c295e01..5743d5bbb5 100644
--- a/activejob/test/support/queue_classic/inline.rb
+++ b/activejob/test/support/queue_classic/inline.rb
@@ -7,5 +7,17 @@ module QC
       receiver = eval(receiver_str)
       receiver.send(message, *args)
     end
+
+    def enqueue_in(seconds, method, *args)
+      receiver_str, _, message = method.rpartition('.')
+      receiver = eval(receiver_str)
+      receiver.send(message, *args)
+    end
+
+    def enqueue_at(not_before, method, *args)
+      receiver_str, _, message = method.rpartition('.')
+      receiver = eval(receiver_str)
+      receiver.send(message, *args)
+    end
   end
 end
diff --git a/guides/source/active_job_basics.md b/guides/source/active_job_basics.md
index e2f13d557a..df51231596 100644
--- a/guides/source/active_job_basics.md
+++ b/guides/source/active_job_basics.md
@@ -113,18 +113,23 @@ Active Job has adapters for the following queueing backends:
 
 #### Backends Features
 
-|                       | Async | Queues  | Delayed | Priorities  | Timeout | Retries |
-|-----------------------|-------|---------|---------|-------------|---------|---------|
-| **Backburner**        | Yes   | Yes     | Yes     | Yes         | Job     | Global  |
-| **Delayed Job**       | Yes   | Yes     | Yes     | Job         | Global  | Global  |
-| **Que**               | Yes   | Yes     | Yes     | Job         | No      | Job     |
-| **Queue Classic**     | Yes   | Yes     | Gem     | No          | No      | No      |
-| **Resque**            | Yes   | Yes     | Gem     | Queue       | Global  | Yes     |
-| **Sidekiq**           | Yes   | Yes     | Yes     | Queue       | No      | Job     |
-| **Sneakers**          | Yes   | Yes     | No      | Queue       | Queue   | No      |
-| **Sucker Punch**      | Yes   | Yes     | Yes     | No          | No      | No      |
-| **Active Job Inline** | No    | Yes     | N/A     | N/A         | N/A     | N/A     |
-| **Active Job**        | Yes   | Yes     | Yes     | No          | No      | No      |
+|                       | Async | Queues | Delayed   | Priorities | Timeout | Retries |
+|-----------------------|-------|--------|-----------|------------|---------|---------|
+| **Backburner**        | Yes   | Yes    | Yes       | Yes        | Job     | Global  |
+| **Delayed Job**       | Yes   | Yes    | Yes       | Job        | Global  | Global  |
+| **Que**               | Yes   | Yes    | Yes       | Job        | No      | Job     |
+| **Queue Classic**     | Yes   | Yes    | No*       | No         | No      | No      |
+| **Resque**            | Yes   | Yes    | Yes (Gem) | Queue      | Global  | Yes     |
+| **Sidekiq**           | Yes   | Yes    | Yes       | Queue      | No      | Job     |
+| **Sneakers**          | Yes   | Yes    | No        | Queue      | Queue   | No      |
+| **Sucker Punch**      | Yes   | Yes    | No        | No         | No      | No      |
+| **Active Job Inline** | No    | Yes    | N/A       | N/A        | N/A     | N/A     |
+| **Active Job**        | Yes   | Yes    | Yes       | No         | No      | No      |
+
+NOTE:
+* Queue Classic does not support Job scheduling. However you can implement this
+yourself or you can use the queue_classic-later gem. See the documentation for
+ActiveJob::QueueAdapters::QueueClassicAdapter.
 
 ### Change Backends