Module: Epi::Jobs

Extended by:
Forwardable
Defined in:
lib/epi/jobs.rb

Overview

Manages running jobs

Class Attribute Summary collapse

Class Method Summary collapse

Class Attribute Details

.by_pid ⇒ Object (readonly)

Returns the value of attribute by_pid.



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# File 'lib/epi/jobs.rb', line 13

def by_pid
  @by_pid
end

.configuration_files ⇒ Object (readonly)

Returns the value of attribute configuration_files.



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# File 'lib/epi/jobs.rb', line 13

def configuration_files
  @configuration_files
end

Class Method Details

.beat! ⇒ Object 



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# File 'lib/epi/jobs.rb', line 29

def beat!

  # Cancel any scheduled beats
  EventMachine.cancel_timer @next_beat if @next_beat

  # Make sure configuration files have been read
  refresh_config!

  # Snapshot currently running processes
  ProcessStatus.take!

  # Get rid of jobs for config files that have been removed
  clean_configuration_files!

  # Create new jobs
  make_new_jobs!

  # Sync each job with its expectations
  each_value &:sync!

  # Snapshot processes again, so that triggers have access to
  # newly-spawned processes
  ProcessStatus.take!

  # Run job triggers
  each_value &:run_triggers!

  # Write state of each job to data file
  Data.jobs = map { |id, job| [id.to_s, job.state] }.to_h
  Data.save

  # Schedule the next beat
  @next_beat = EventMachine.add_timer(interval) { beat! }
end

.interval ⇒ Object 



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# File 'lib/epi/jobs.rb', line 21

def interval
  if @interval.nil?
    @interval = (ENV['EPI_INTERVAL'] || 5).to_f
    Epi.logger.info "Polling process status every #{@interval} second#{@interval == 1 ? '' : 's'}"
  end
  @interval
end

.job_descriptions ⇒ Object 



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# File 'lib/epi/jobs.rb', line 84

def job_descriptions
  configuration_files.values.inject({}) { |all, conf_file| all.merge! conf_file.job_descriptions }
end

.refresh_config! ⇒ Object 



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# File 'lib/epi/jobs.rb', line 88

def refresh_config!
  Data.configuration_paths.each do |path|
    configuration_files[path] ||= ConfigurationFile.new(path)
  end
  configuration_files.each_value &:read
end

.reset! ⇒ Object 



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# File 'lib/epi/jobs.rb', line 15

def reset!
  @configuration_files = {}
  @jobs = {}
  @by_pid = {}
end

.running_process_count ⇒ Object 



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# File 'lib/epi/jobs.rb', line 80

def running_process_count
  each_value.map(&:running_count).reduce(:+) || 0
end

.shutdown!(&callback) ⇒ Object 



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# File 'lib/epi/jobs.rb', line 64

def shutdown!(&callback)
  EventMachine.cancel_timer @next_beat if @next_beat
  ProcessStatus.take!
  remaining = count
  if remaining > 0
    each_value do |job|
      job.shutdown! do
        remaining -= 1
        callback.call if callback && remaining == 0
      end
    end
  else
    callback.call if callback
  end
end