Parent

Delayed::Worker

Attributes

name_prefix[RW]

name_prefix is ignored if name is set directly

Public Class Methods

after_fork() click to toggle source
# File lib/delayed/worker.rb, line 90
def self.after_fork
  # Re-open file handles
  @files_to_reopen.each do |file|
    begin
      file.reopen file.path, "a+"
      file.sync = true
    rescue ::Exception
    end
  end

  backend.after_fork
end
backend=(backend) click to toggle source
# File lib/delayed/worker.rb, line 65
def self.backend=(backend)
  if backend.is_a? Symbol
    require "delayed/serialization/#{backend}"
    require "delayed/backend/#{backend}"
    backend = "Delayed::Backend::#{backend.to_s.classify}::Job".constantize
  end
  @@backend = backend
  silence_warnings { ::Delayed.const_set(:Job, backend) }
end
before_fork() click to toggle source
# File lib/delayed/worker.rb, line 79
def self.before_fork
  unless @files_to_reopen
    @files_to_reopen = []
    ObjectSpace.each_object(File) do |file|
      @files_to_reopen << file unless file.closed?
    end
  end

  backend.before_fork
end
guess_backend() click to toggle source
# File lib/delayed/worker.rb, line 75
def self.guess_backend
  warn "[DEPRECATION] guess_backend is deprecated. Please remove it from your code."
end
lifecycle() click to toggle source
# File lib/delayed/worker.rb, line 103
def self.lifecycle
  @lifecycle ||= Delayed::Lifecycle.new
end
new(options={}) click to toggle source
# File lib/delayed/worker.rb, line 107
def initialize(options={})
  @quiet = options.has_key?(:quiet) ? options[:quiet] : true

  [:min_priority, :max_priority, :sleep_delay, :read_ahead, :queues, :exit_on_complete].each do |option|
    self.class.send("#{option}=", options[option]) if options.has_key?(option)
  end

  self.plugins.each { |klass| klass.new }
end
reset() click to toggle source
# File lib/delayed/worker.rb, line 31
def self.reset
  self.sleep_delay      = DEFAULT_SLEEP_DELAY
  self.max_attempts     = DEFAULT_MAX_ATTEMPTS
  self.max_run_time     = DEFAULT_MAX_RUN_TIME
  self.default_priority = DEFAULT_DEFAULT_PRIORITY
  self.delay_jobs       = DEFAULT_DELAY_JOBS
  self.queues           = DEFAULT_QUEUES
  self.read_ahead       = DEFAULT_READ_AHEAD
end

Public Instance Methods

failed(job) click to toggle source
# File lib/delayed/worker.rb, line 230
def failed(job)
  self.class.lifecycle.run_callbacks(:failure, self, job) do
    job.hook(:failure)
    self.class.destroy_failed_jobs ? job.destroy : job.fail!
  end
end
max_attempts(job) click to toggle source
# File lib/delayed/worker.rb, line 243
def max_attempts(job)
  job.max_attempts || self.class.max_attempts
end
name() click to toggle source

Every worker has a unique name which by default is the pid of the process. There are some advantages to overriding this with something which survives worker retarts: Workers can# safely resume working on tasks which are locked by themselves. The worker will assume that it crashed before.

# File lib/delayed/worker.rb, line 121
def name
  return @name unless @name.nil?
  "#{@name_prefix}host:#{Socket.gethostname} pid:#{Process.pid}" rescue "#{@name_prefix}pid:#{Process.pid}"
end
name=(val) click to toggle source

Sets the name of the worker. Setting the name to nil will reset the default worker name

# File lib/delayed/worker.rb, line 128
def name=(val)
  @name = val
end
reschedule(job, time = nil) click to toggle source

Reschedule the job in the future (when a job fails). Uses an exponential scale depending on the number of failed attempts.

# File lib/delayed/worker.rb, line 218
def reschedule(job, time = nil)
  if (job.attempts += 1) < max_attempts(job)
    time ||= job.reschedule_at
    job.run_at = time
    job.unlock
    job.save!
  else
    say "PERMANENTLY removing #{job.name} because of #{job.attempts} consecutive failures.", Logger::INFO
    failed(job)
  end
end
run(job) click to toggle source
# File lib/delayed/worker.rb, line 201
def run(job)
  runtime =  Benchmark.realtime do
    Timeout.timeout(self.class.max_run_time.to_i, WorkerTimeout) { job.invoke_job }
    job.destroy
  end
  say "#{job.name} completed after %.4f" % runtime
  return true  # did work
rescue DeserializationError => error
  job.last_error = "#{error.message}\n#{error.backtrace.join("\n")}"
  failed(job)
rescue Exception => error
  self.class.lifecycle.run_callbacks(:error, self, job){ handle_failed_job(job, error) }
  return false  # work failed
end
say(text, level = Logger::INFO) click to toggle source
# File lib/delayed/worker.rb, line 237
def say(text, level = Logger::INFO)
  text = "[Worker(#{name})] #{text}"
  puts text unless @quiet
  logger.add level, "#{Time.now.strftime('%FT%T%z')}: #{text}" if logger
end
start() click to toggle source
# File lib/delayed/worker.rb, line 132
def start
  trap('TERM') do
    say 'Exiting...'
    stop
    raise SignalException.new('TERM') if self.class.raise_signal_exceptions
  end

  trap('INT') do
    say 'Exiting...'
    stop
    raise SignalException.new('INT') if self.class.raise_signal_exceptions && self.class.raise_signal_exceptions != :term
  end

  say "Starting job worker"

  self.class.lifecycle.run_callbacks(:execute, self) do
    loop do
      self.class.lifecycle.run_callbacks(:loop, self) do
        @realtime = Benchmark.realtime do
          @result = work_off
        end
      end

      count = @result.sum

      if count.zero?
        if self.class.exit_on_complete
          say "No more jobs available. Exiting"
          break
        else
          sleep(self.class.sleep_delay) unless stop?
        end
      else
        say "#{count} jobs processed at %.4f j/s, %d failed ..." % [count / @realtime, @result.last]
      end

      break if stop?
    end
  end
end
stop() click to toggle source
# File lib/delayed/worker.rb, line 173
def stop
  @exit = true
end
stop?() click to toggle source
# File lib/delayed/worker.rb, line 177
def stop?
  !!@exit
end
work_off(num = 100) click to toggle source

Do num jobs and return stats on success/failure. Exit early if interrupted.

# File lib/delayed/worker.rb, line 183
def work_off(num = 100)
  success, failure = 0, 0

  num.times do
    case reserve_and_run_one_job
    when true
        success += 1
    when false
        failure += 1
    else
      break  # leave if no work could be done
    end
    break if stop? # leave if we're exiting
  end

  return [success, failure]
end

Protected Instance Methods

handle_failed_job(job, error) click to toggle source
# File lib/delayed/worker.rb, line 249
def handle_failed_job(job, error)
  job.last_error = "#{error.message}\n#{error.backtrace.join("\n")}"
  say "#{job.name} failed with #{error.class.name}: #{error.message} - #{job.attempts} failed attempts", Logger::ERROR
  reschedule(job)
end
reserve_and_run_one_job() click to toggle source

Run the next job we can get an exclusive lock on. If no jobs are left we return nil

# File lib/delayed/worker.rb, line 257
def reserve_and_run_one_job
  job = Delayed::Job.reserve(self)
  self.class.lifecycle.run_callbacks(:perform, self, job){ result = run(job) } if job
end

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