Class: Eventboss::Launcher

Inherits:
Object
  • Object
show all
Includes:
Logging
Defined in:
lib/eventboss/launcher.rb

Overview

Launcher manages lifecycle of queues and pollers threads

Constant Summary collapse

DEFAULT_SHUTDOWN_ATTEMPTS = 
5
DEFAULT_SHUTDOWN_DELAY = 
5

Instance Method Summary collapse

Methods included from Logging

#logger

Constructor Details

#initialize(queues, client, options = {}) ⇒ Launcher

Returns a new instance of Launcher.



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# File 'lib/eventboss/launcher.rb', line 9

def initialize(queues, client, options = {})
  @options = options
  @queues = queues
  @client = client

  @lock = Mutex.new
  @bus = SizedQueue.new(@queues.size * 10)

  @pollers = Set.new
  @queues.each { |q, listener| @pollers << new_poller(q, listener) }

  @workers = Set.new
  worker_count.times { |id| @workers << new_worker(id) }
end

Instance Method Details

#hard_shutdown ⇒ Object 



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# File 'lib/eventboss/launcher.rb', line 42

def hard_shutdown
  return if @pollers.empty? && @workers.empty?

  logger.info("Killing remaining #{@pollers.size} pollers, #{@workers.size} workers", 'launcher')
  @pollers.each(&:kill)
  @workers.each(&:kill)
end

#poller_stopped(poller, restart: false) ⇒ Object 



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# File 'lib/eventboss/launcher.rb', line 58

def poller_stopped(poller, restart: false)
  @lock.synchronize do
    @pollers.delete(poller)
    @pollers << new_poller(poller.queue, poller.listener).tap(&:start) if restart
  end
  logger.debug("Poller #{poller.id} stopped, restart: #{restart}", 'launcher')
end

#start ⇒ Object 



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# File 'lib/eventboss/launcher.rb', line 24

def start
  logger.info("Starting #{@workers.size} workers, #{@pollers.size} pollers", 'launcher')

  @pollers.each(&:start)
  @workers.each(&:start)
end

#stop ⇒ Object 



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# File 'lib/eventboss/launcher.rb', line 31

def stop
  logger.info('Gracefully shutdown', 'launcher')

  @bus.clear
  @pollers.each(&:terminate)
  @workers.each(&:terminate)

  wait_for_shutdown
  hard_shutdown
end

#worker_stopped(worker, restart: false) ⇒ Object 



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# File 'lib/eventboss/launcher.rb', line 50

def worker_stopped(worker, restart: false)
  @lock.synchronize do
    @workers.delete(worker)
    @workers << new_worker(worker.id).tap(&:start) if restart
  end
  logger.debug("Worker #{worker.id} stopped, restart: #{restart}", 'launcher')
end