discourse/lib/scheduler/defer.rb

69 lines
1.3 KiB
Ruby

module Scheduler
module Deferrable
def initialize
@async = !Rails.env.test?
@queue = Queue.new
@mutex = Mutex.new
@thread = nil
start_thread
end
# for test
def async=(val)
@async = val
end
def later(desc = nil, &blk)
if @async
start_thread unless @thread.alive?
@queue << [RailsMultisite::ConnectionManagement.current_db, blk, desc]
else
blk.call
end
end
def stop!
@thread.kill
end
# test only
def stopped?
!@thread.alive?
end
private
def start_thread
@mutex.synchronize do
return if @thread && @thread.alive?
@thread = Thread.new {
while true
do_work
end
}
end
end
def do_work
db, job, desc = @queue.deq
begin
RailsMultisite::ConnectionManagement.establish_connection(db: db)
job.call
rescue => ex
Discourse.handle_exception(ex, {message: "Running deferred code '#{desc}'"})
end
rescue => ex
Discourse.handle_exception(ex, {message: "Processing deferred code queue"})
ensure
ActiveRecord::Base.connection_handler.clear_active_connections!
end
end
class Defer
extend Deferrable
initialize
end
end