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require 'delegate'
require 'thread'
module ActiveSupport
# A Queue that simply inherits from STDLIB's Queue. When this
# queue is used, Rails automatically starts a job runner in a
# background thread.
class Queue < ::Queue
attr_writer :consumer
def initialize(consumer_options = {})
super()
@consumer_options = consumer_options
end
def consumer
@consumer ||= ThreadedQueueConsumer.new(self, @consumer_options)
end
# Drain the queue, running all jobs in a different thread. This method
# may not be available on production queues.
def drain
# run the jobs in a separate thread so assumptions of synchronous
# jobs are caught in test mode.
consumer.drain
end
end
class SynchronousQueue < Queue
def push(job)
super.tap { drain }
end
alias << push
alias enq push
end
# In test mode, the Rails queue is backed by an Array so that assertions
# can be made about its contents. The test queue provides a +jobs+
# method to make assertions about the queue's contents and a +drain+
# method to drain the queue and run the jobs.
#
# Jobs are run in a separate thread to catch mistakes where code
# assumes that the job is run in the same thread.
class TestQueue < Queue
# Get a list of the jobs off this queue. This method may not be
# available on production queues.
def jobs
@que.dup
end
# Marshal and unmarshal job before pushing it onto the queue. This will
# raise an exception on any attempts in tests to push jobs that can't (or
# shouldn't) be marshalled.
def push(job)
super Marshal.load(Marshal.dump(job))
end
end
# The threaded consumer will run jobs in a background thread in
# development mode or in a VM where running jobs on a thread in
# production mode makes sense.
#
# When the process exits, the consumer pushes a nil onto the
# queue and joins the thread, which will ensure that all jobs
# are executed before the process finally dies.
class ThreadedQueueConsumer
attr_accessor :logger
def initialize(queue, options = {})
@queue = queue
@logger = options[:logger]
@fallback_logger = Logger.new($stderr)
end
def start
@thread = Thread.new { consume }
self
end
def shutdown
@queue.push nil
@thread.join
end
def drain
@queue.pop.run until @queue.empty?
end
def consume
while job = @queue.pop
run job
end
end
def run(job)
job.run
rescue Exception => exception
handle_exception job, exception
end
def handle_exception(job, exception)
(logger || @fallback_logger).error "Job Error: #{job.inspect}\n#{exception.message}\n#{exception.backtrace.join("\n")}"
end
end
end
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