Class: Sisyphus::Master

Inherits:
Object
  • Object
show all
Defined in:
lib/sisyphus/master.rb

Constant Summary collapse

IO_TIMEOUT = 
10
HANDLED_SIGNALS = 
[:INT, :TTIN, :TTOU]

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(job, options = {}) ⇒ Master

Returns a new instance of Master.



13
14
15
16
17
18
19
20
21
22
23
 
# File 'lib/sisyphus/master.rb', line 13

def initialize(job, options = {})
  @number_of_workers = options.fetch :workers, 0
  @logger = options.fetch :logger, NullLogger.new
  @workers = []
  @job = job

  self_reader, self_writer = IO.pipe
  @selfpipe = { reader: self_reader, writer: self_writer }

  Thread.main[:signal_queue] = []
end

Instance Attribute Details

#logger ⇒ Object (readonly)

Returns the value of attribute logger.



11
12
13
 
# File 'lib/sisyphus/master.rb', line 11

def logger
  @logger
end

Instance Method Details

#start ⇒ Object 



25
26
27
28
29
30
31
32
33
 
# File 'lib/sisyphus/master.rb', line 25

def start
  trap_signals
  @number_of_workers.times do
    start_worker
    sleep rand(1000).fdiv(1000)
  end
  puts "Sisyphus::Master started with PID: #{Process.pid}"
  watch_for_output
end

#start_worker ⇒ Object 



35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
 
# File 'lib/sisyphus/master.rb', line 35

def start_worker
  reader, writer = IO.pipe
  if wpid = fork
    writer.close
    @workers << { pid: wpid, reader: reader }
  else
    reader.close
    self.process_name = "Worker #{Process.pid}"
    begin
      worker = Worker.new(@job, writer, logger)
      worker.setup
      worker.start
    rescue Exception => e
      writer.write Worker::UNCAUGHT_ERROR
      logger.warn(process_name) { e }
      exit! 0
    end
  end
end

#stop_all ⇒ Object 



61
62
63
64
65
66
67
68
 
# File 'lib/sisyphus/master.rb', line 61

def stop_all
  @workers.each do |worker|
    stop_worker worker.fetch(:pid)
  end
  Timeout.timeout(30) do
    watch_for_shutdown while worker_count > 0
  end
end

#stop_worker(wpid) ⇒ Object 



55
56
57
58
59
 
# File 'lib/sisyphus/master.rb', line 55

def stop_worker(wpid)
  if @workers.find { |w| w.fetch(:pid) == wpid }
    Process.kill 'INT', wpid rescue Errno::ESRCH # Ignore if the process is already gone
  end
end

#worker_count ⇒ Object 



70
71
72
 
# File 'lib/sisyphus/master.rb', line 70

def worker_count
  @workers.length
end