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require 'concurrent'
require 'thread_safe'
module ActiveJob
# == Active Job Async Job
#
# When enqueueing jobs with Async Job each job will be executed asynchronously
# on a +concurrent-ruby+ thread pool. All job data is retained in memory.
# Because job data is not saved to a persistent datastore there is no
# additional infrastructure needed and jobs process quickly. The lack of
# persistence, however, means that all unprocessed jobs will be lost on
# application restart. Therefore in-memory queue adapters are unsuitable for
# most production environments but are excellent for development and testing.
#
# Read more about Concurrent Ruby {here}[https://github.com/ruby-concurrency/concurrent-ruby].
#
# To use Async Job set the queue_adapter config to +:async+.
#
# Rails.application.config.active_job.queue_adapter = :async
#
# Async Job supports job queues specified with +queue_as+. Queues are created
# automatically as needed and each has its own thread pool.
class AsyncJob
DEFAULT_EXECUTOR_OPTIONS = {
min_threads: [2, Concurrent.processor_count].max,
max_threads: Concurrent.processor_count * 10,
auto_terminate: true,
idletime: 60, # 1 minute
max_queue: 0, # unlimited
fallback_policy: :caller_runs # shouldn't matter -- 0 max queue
}.freeze
QUEUES = ThreadSafe::Cache.new do |hash, queue_name| #:nodoc:
hash.compute_if_absent(queue_name) { ActiveJob::AsyncJob.create_thread_pool }
end
class << self
# Forces jobs to process immediately when testing the Active Job gem.
# This should only be called from within unit tests.
def perform_immediately! #:nodoc:
@perform_immediately = true
end
# Allows jobs to run asynchronously when testing the Active Job gem.
# This should only be called from within unit tests.
def perform_asynchronously! #:nodoc:
@perform_immediately = false
end
def create_thread_pool #:nodoc:
if @perform_immediately
Concurrent::ImmediateExecutor.new
else
Concurrent::ThreadPoolExecutor.new(DEFAULT_EXECUTOR_OPTIONS)
end
end
def enqueue(job_data, queue: 'default') #:nodoc:
QUEUES[queue].post(job_data) { |job| ActiveJob::Base.execute(job) }
end
def enqueue_at(job_data, timestamp, queue: 'default') #:nodoc:
delay = timestamp - Time.current.to_f
if delay > 0
Concurrent::ScheduledTask.execute(delay, args: [job_data], executor: QUEUES[queue]) do |job|
ActiveJob::Base.execute(job)
end
else
enqueue(job_data, queue: queue)
end
end
end
end
end
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