debian-mirror-gitlab/lib/gitlab/daemon.rb

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# frozen_string_literal: true
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module Gitlab
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# DEPRECATED. Use Gitlab::BackgroundTask for new code instead.
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class Daemon
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# Options:
# - recreate: We usually only allow a single instance per process to exist;
# this can be overridden with this switch, so that existing
# instances are stopped and recreated.
def self.initialize_instance(*args, recreate: false, **options)
if @instance
if recreate
@instance.stop
else
raise "#{name} singleton instance already initialized"
end
end
@instance = new(*args, **options)
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Kernel.at_exit(&@instance.method(:stop))
@instance
end
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def self.instance(...)
@instance ||= initialize_instance(...)
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end
attr_reader :thread
def thread?
!thread.nil?
end
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# Possible options:
# - synchronous [Boolean] if true, turns `start` into a blocking call
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def initialize(**options)
@synchronous = options[:synchronous]
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@mutex = Mutex.new
end
def enabled?
true
end
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def thread_name
self.class.name.demodulize.underscore
end
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def start
return unless enabled?
@mutex.synchronize do
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break thread if thread?
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if start_working
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@thread = Thread.new do
Thread.current.name = thread_name
run_thread
end
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@thread.join if @synchronous
@thread
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end
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end
end
def stop
@mutex.synchronize do
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break unless thread?
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stop_working
if thread
thread.wakeup if thread.alive?
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begin
thread.join unless Thread.current == thread
rescue Exception # rubocop:disable Lint/RescueException
end
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@thread = nil
end
end
end
private
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# Executed in lock context before starting thread
# Needs to return success
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def start_working
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true
end
# Executed in separate thread
def run_thread
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raise NotImplementedError
end
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# Executed in lock context
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def stop_working
# no-ops
end
end
end