feed_updater.rb
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# to run by hand
if $PROGRAM_NAME == __FILE__
require File.dirname(__FILE__) + '/../config/environment'
end
# This class implements the feed updater. To change how often a feed gets
# updated, change FeedUpdater#update_interval in your config/local.rb file like
# this:
#
# FeedUpdater.update_interval = 24.hours
#
# You can also customize the time between update runs setting
# FeedUpdater#daemon_sleep_interval. Give it an integer representing the number
# of seconds to wait between runs in your config/local.rb:
#
# FeedUpdater.daemon_sleep_interval = 10
#
# The feed updaters is controlled by script/feed-updater, which starts and
# stops the process.
class FeedUpdater
# indicates how much time one feed will be left without updates
# (ActiveSupport::Duration). Default: <tt>4.hours</tt>
cattr_accessor :update_interval
self.update_interval = 4.hours
# indicates for how much time the daemon sleeps before looking for new feeds
# to load (in seconds, an integer). Default: 30
cattr_accessor :daemon_sleep_interval
self.daemon_sleep_interval = 30
attr_accessor :running
def initialize
self.running = true
end
def start
['TERM', 'INT'].each do |signal|
Signal.trap(signal) do
stop
puts "Feed updater exiting gracefully ..."
end
end
puts "Feed updater started."
run
puts "Feed updater exited."
end
def run
while running
process_round
wait
end
end
def wait
i = 0
while running && i < FeedUpdater.daemon_sleep_interval
sleep 1
i += 1
end
end
def stop
self.running = false
end
def process_round
feed_handler = FeedHandler.new
[FeedReaderBlock, ExternalFeed].each do |source|
if !running
break
end
source.enabled.expired.all.each do |container|
if !running
break
end
feed_handler.process(container)
end
end
end
end
# run the updater
if ($PROGRAM_NAME == __FILE__)
FeedUpdater.new.start
end