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lockfile with cron

/ Published in: Ruby
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Example of how to use a cron like a daemon and avoid having the cron run two instances of the same script.

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  1. begin
  2.  Lockfile.new('cron_mail_fetcher.lock', :retries => 0) do
  3.    config = YAML.load_file("#{RAILS_ROOT}/config/mail.yml")
  4.    config = config[RAILS_ENV].to_options
  5.  
  6.    puts "Running MailFetcher in #{RAILS_ENV} mode"
  7.    fetcher = Fetcher.create({:receiver => MailReceiver}.merge(config))
  8.    fetcher.fetch
  9.  
  10.    puts "Finished running MailFetcher in #{RAILS_ENV} mode"
  11.  end
  12. rescue Lockfile::MaxTriesLockError => e
  13.  puts "Another fetcher is already running. Exiting."
  14. end

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