Module: Delayed::JobLauncher

Included in:
Worker
Defined in:
lib/delayed/job_launcher.rb

Constant Summary collapse

MAX_ACTIVE_JOBS = 
50

Instance Method Summary collapse

Instance Method Details

#check_thread_sanity ⇒ Object

Sanity check of dead threads for precaution, but probably won’t be necessary



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# File 'lib/delayed/job_launcher.rb', line 83

def check_thread_sanity
  each_job_in_execution do |job, started_at, thread|
    unless thread.alive?
      log "Dead thread? Terminate it!, This should not be happening"
      thread.terminate
    end
  end
end

#initialize_launcher(max_active_jobs = MAX_ACTIVE_JOBS) ⇒ Object

Initialize the launcher, you can specified the maximun number of jobs executing in parallel, by default MAX_ACTIVE_JOBS constant

The launcher has a hash with the following structure: {}

|- id
|   `{}
|     |-:thread     => Thread
|     |-:job        => Delayed::Job
|     `-:started_at => Time
`-...

If group_by specified an ActiveRecord::Base object, id will be the primary key of those objects.



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# File 'lib/delayed/job_launcher.rb', line 34

def initialize_launcher(max_active_jobs=MAX_ACTIVE_JOBS)
  @max_active_jobs = max_active_jobs
  @jobs = {}
  @mutex = Mutex.new
end

#jobs_ids_in_execution ⇒ Object 



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# File 'lib/delayed/job_launcher.rb', line 97

def jobs_ids_in_execution
  ret = []
  each_job_in_execution {|job, x, xx| ret << job.id }
  ret
end

#jobs_in_execution ⇒ Object

Number of jobs executing right now



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# File 'lib/delayed/job_launcher.rb', line 93

def jobs_in_execution
  @jobs.size
end

#kill_threads! ⇒ Object 



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# File 'lib/delayed/job_launcher.rb', line 103

def kill_threads!
  each_job_in_execution do |job, started_at, thread|
    log "Killing #{job.name}"
    thread.terminate
  end
end

#launch(job) ⇒ Object

Launch the job in a thread and register it. Returns whether the job has been launched or not.



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# File 'lib/delayed/job_launcher.rb', line 42

def launch(job)
  return false unless can_execute job
  s = Semaphore.new
  t = Thread.new do
    log "##{Thread.current.object_id} before wait"
    s.wait
    log "###{Thread.current.object_id} after wait"
    begin
      job.run_with_lock Job::MAX_RUN_TIME, name
    rescue Exception => e
      log "ERROR: #{e}"
    ensure
      unregister_job job
    end
  end
  register_job job, t
  s.signal
  log "Launched job #{job.name}, there are #{jobs_in_execution} jobs in execution"
  return true
end

#report_jobs_state ⇒ Object

Print information about the current state to stdout



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# File 'lib/delayed/job_launcher.rb', line 64

def report_jobs_state
  if jobs_in_execution > 0
    margin = 20
    title = "Jobs In Execution"
    log "#{'='*margin} #{title} #{'='*margin} "
    log " There are #{jobs_in_execution} jobs running."
    each_job_in_execution do |job, started_at, thread|
      duration = Duration.new(Time.now - started_at)
      log "\tJob #{job.id}: #{job.name}"
      log "\t   Running on #{thread} (#{thread.status}) for #{duration}"
    end
    log "#{'=' * (margin * 2 + title.size + 2)} "
  else
    log "\n\tThere is no jobs in execution right now!"
  end
end