Class: Kamisama::Task

Inherits:
Object
  • Object
show all
Defined in:
lib/kamisama/task.rb

Instance Method Summary collapse

Constructor Details

#initialize(task_index, block) ⇒ Task 



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# File 'lib/kamisama/task.rb', line 3

def initialize(task_index, block)
  @task_index = task_index
  @block = block
end

Instance Method Details

#alive? ⇒ Boolean 



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# File 'lib/kamisama/task.rb', line 39

def alive?
  Process.getpgid(@pid)
  true
rescue Errno::ESRCH
  false
end

#log(message) ⇒ Object 



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# File 'lib/kamisama/task.rb', line 46

def log(message)
  puts "[WORKER #{@task_index}] #{message}"
end

#restart! ⇒ Object 



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# File 'lib/kamisama/task.rb', line 29

def restart!
  puts "[Kamisama Master] Restarting Worker."
  @pid = nil
  start
end

#start ⇒ Object 



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# File 'lib/kamisama/task.rb', line 8

def start
  @pid = Process.fork do
    begin
      # receive sigterm when parent dies
      Kamisama::ProcessCtrl.set_parent_death_signal(:sigterm)

      log("Worker started. Hello!")

      @block.call(@task_index)
    rescue Exception => e
      # handle all exceptions, even system ones
      log("Shutting down... #{e.message}")
      exit
    ensure
      exit
    end
  end

  Process.detach(@pid)
end

#terminate! ⇒ Object 



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# File 'lib/kamisama/task.rb', line 35

def terminate!
  Process.kill("TERM", @pid)
end