Class: Msgr::Pool

Inherits:
Object
  • Object
show all
Includes:
Celluloid, Logging
Defined in:
lib/msgr/pool.rb

Defined Under Namespace

Classes: Worker

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Logging

#log, #log_name

Constructor Details

#initialize(runner_klass, opts = {}) ⇒ Pool

Returns a new instance of Pool.



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# File 'lib/msgr/pool.rb', line 8

def initialize(runner_klass, opts = {})
  @runner_klass = runner_klass
  @runner_args  = opts[:args] ? Array(opts[:args]) : []
  @size         = (opts[:size] || Celluloid.cores).to_i
  @running      = false

  raise ArgumentError.new 'Pool size must be greater zero.' if @size <= 0

  log(:debug) { "Inialize size => #{@size}" }

  every([opts.fetch(:stats_interval, 30).to_i, 1].max) { log_status } if opts[:nostats].nil? || opts[:nostats]
end

Instance Attribute Details

#size ⇒ Object (readonly)

Returns the value of attribute size.



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# File 'lib/msgr/pool.rb', line 6

def size
  @size
end

Instance Method Details

#available? ⇒ Boolean

Check if a worker is available.

Returns:

  • (Boolean) —

    True if at least on idle worker is available, false otherwise.



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# File 'lib/msgr/pool.rb', line 71

def available?
  idle.any?
end

#busy ⇒ Object 



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# File 'lib/msgr/pool.rb', line 26

def busy; @busy ||= [] end

#dispatch(*args) ⇒ Object

Dispatch given message to a worker.



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# File 'lib/msgr/pool.rb', line 81

def dispatch(*args)
  log(:debug) { 'Dispatch message to worker.' }

  fetch_idle_worker.future :dispatch, args
end

#executed(worker) ⇒ Object

Called by worker to indicated it has finished processing.

Parameters:

  • worker (Pool::Worker) —

    Worker that finished processing.



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# File 'lib/msgr/pool.rb', line 103

def executed(worker)
  busy.delete worker

  if running?
    idle << worker
    after(0) { signal :worker_done }
  else
    log(:debug) { "Terminate worker. Still #{busy.size} to go..." }

    worker.terminate if worker.alive?
    if busy.empty?
      log(:debug) { 'All worker down. Signal :shutdown.' }
      after(0) { signal :shutdown }
    end
  end
end

#fetch_idle_worker ⇒ Object

Return an idle worker.



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# File 'lib/msgr/pool.rb', line 89

def fetch_idle_worker
  if (worker = idle.shift)
    busy << worker
    worker
  else
    wait :worker_done
    fetch_idle_worker
  end
end

#idle ⇒ Object 



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# File 'lib/msgr/pool.rb', line 25

def idle; @idle ||= [] end

#log_status ⇒ Object 



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# File 'lib/msgr/pool.rb', line 44

def log_status
  log(:info) { "[STATUS] Idle: #{idle.size} Busy: #{busy.size}" }
end

#messages ⇒ Object 



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# File 'lib/msgr/pool.rb', line 75

def messages
  @message ||= []
end

#running? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/msgr/pool.rb', line 21

def running?
  @running
end

#start ⇒ Object 



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# File 'lib/msgr/pool.rb', line 28

def start
  return if running?

  log(:debug) { 'Spin up worker pool' }
  @running = true

  idle.clear
  busy.clear

  @size.times.map do |index|
    idle << Worker.new_link(Actor.current, index, @runner_klass, @runner_args)
  end

  log(:debug) { 'Pool ready.' }
end

#stop ⇒ Object Also known as: shutdown

Request a graceful shutdown of all pool workers.



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# File 'lib/msgr/pool.rb', line 50

def stop
  log(:debug) { 'Graceful shutdown requested.' }

  @running = false
  idle.each { |worker| worker.terminate }
  idle.clear

  if busy.any?
    log(:debug) { "Wait for #{busy.size} workers to terminate." }

    wait :shutdown
  end

  log(:debug) { 'Graceful shutdown done.' }
end

#to_s ⇒ Object 



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# File 'lib/msgr/pool.rb', line 120

def to_s
  "#{self.class.name}[#{@runner_klass}]<#{object_id}>"
end