Class: SuckerPunch::Queue

Inherits:
Concurrent::Synchronization::LockableObject
  • Object
show all
Extended by:
Forwardable
Includes:
Concurrent::ExecutorService
Defined in:
lib/sucker_punch/queue.rb,
lib/sucker_punch/testing.rb

Constant Summary collapse

DEFAULT_MAX_QUEUE_SIZE =

Unlimited

0
DEFAULT_EXECUTOR_OPTIONS = 
{
  min_threads:     2,
  max_threads:     2,
  idletime:        60, # 1 minute
  auto_terminate:  false # Let shutdown modes handle thread termination
}.freeze
QUEUES = 
Concurrent::Map.new
PAUSE_TIME = 
STDOUT.tty? ? 0.1 : 0.5

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(name, pool) ⇒ Queue

Returns a new instance of Queue.



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# File 'lib/sucker_punch/queue.rb', line 134

def initialize(name, pool)
  super()
  @running = true
  @name, @pool = name, pool
end

Instance Attribute Details

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/sucker_punch/queue.rb', line 112

def name
  @name
end

Class Method Details

.all ⇒ Object 



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# File 'lib/sucker_punch/queue.rb', line 33

def self.all
  queues = Concurrent::Array.new
  QUEUES.each_pair do |name, pool|
    queues.push new(name, pool)
  end
  queues
end

.clear ⇒ Object 



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# File 'lib/sucker_punch/queue.rb', line 41

def self.clear
  # susceptible to race conditions--only use in testing
  old = all
  QUEUES.clear
  SuckerPunch::Counter::Busy.clear
  SuckerPunch::Counter::Processed.clear
  SuckerPunch::Counter::Failed.clear
  old.each { |queue| queue.kill }
end

.find_or_create(name, number_workers = 2) ⇒ Object 



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# File 'lib/sucker_punch/queue.rb', line 19

def self.find_or_create(name, num_workers = 2, num_jobs_max = nil)
  pool = QUEUES.fetch_or_store(name) do
    options = DEFAULT_EXECUTOR_OPTIONS
      .merge(
        min_threads: num_workers,
        max_threads: num_workers,
        max_queue: num_jobs_max || DEFAULT_MAX_QUEUE_SIZE
      )
    Concurrent::ThreadPoolExecutor.new(options)
  end

  new(name, pool)
end

.shutdown_all ⇒ Object 



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# File 'lib/sucker_punch/queue.rb', line 74

def self.shutdown_all
  deadline = Time.now + SuckerPunch.shutdown_timeout

  if SuckerPunch::RUNNING.make_false
    # If a job is enqueued right before the script exits
    # (command line, rake task, etc.), the system needs an
    # interval to allow the enqueue jobs to make it in to the system
    # otherwise the queue will look idle
    sleep PAUSE_TIME

    queues = all

    # Issue shutdown to each queue and let them wrap up their work. This
    # prevents new jobs from being enqueued and lets the pool clean up
    # after itself
    queues.each { |queue| queue.shutdown }

    # return if every queue is empty and workers in every queue are idle
    return if queues.all? { |queue| queue.idle? }

    SuckerPunch.logger.info("Pausing to allow workers to finish...")

    remaining = deadline - Time.now

    # Continue to loop through each queue and test if it's idle, while
    # respecting the shutdown timeout
    while remaining > PAUSE_TIME
      return if queues.all? { |queue| queue.idle? }
      sleep PAUSE_TIME
      remaining = deadline - Time.now
    end

    # Queues haven't finished work. Aggressively kill them.
    SuckerPunch.logger.warn("Queued jobs didn't finish before shutdown_timeout...killing remaining jobs")
    queues.each { |queue| queue.kill }
  end
end

.stats ⇒ Object 



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# File 'lib/sucker_punch/queue.rb', line 51

def self.stats
  queues = {}

  all.each do |queue|
    queues[queue.name] = {
      "workers" => {
        "total" => queue.total_workers,
        "busy" => queue.busy_workers,
        "idle" => queue.idle_workers,
      },
      "jobs" => {
        "processed" => queue.processed_jobs,
        "failed" => queue.failed_jobs,
        "enqueued" => queue.enqueued_jobs,
      }
    }
  end

  queues
end

Instance Method Details

#==(other) ⇒ Object 



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# File 'lib/sucker_punch/queue.rb', line 148

def ==(other)
  pool == other.pool
end

#busy_workers ⇒ Object 



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# File 'lib/sucker_punch/queue.rb', line 152

def busy_workers
  SuckerPunch::Counter::Busy.new(name).value
end

#failed_jobs ⇒ Object 



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# File 'lib/sucker_punch/queue.rb', line 164

def failed_jobs
  SuckerPunch::Counter::Failed.new(name).value
end

#idle? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/sucker_punch/queue.rb', line 144

def idle?
  enqueued_jobs == 0 && busy_workers == 0
end

#idle_workers ⇒ Object 



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# File 'lib/sucker_punch/queue.rb', line 156

def idle_workers
  total_workers - busy_workers
end

#kill ⇒ Object 



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# File 'lib/sucker_punch/queue.rb', line 178

def kill
  @pool.kill
end

#post(*args, &block) ⇒ Object 



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# File 'lib/sucker_punch/queue.rb', line 168

def post(*args, &block)
  synchronize do
    if @running
      @pool.post(*args, &block)
    else
      false
    end
  end
end

#processed_jobs ⇒ Object 



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# File 'lib/sucker_punch/queue.rb', line 160

def processed_jobs
  SuckerPunch::Counter::Processed.new(name).value
end

#running? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/sucker_punch/queue.rb', line 140

def running?
  synchronize { @running }
end

#shutdown ⇒ Object 



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# File 'lib/sucker_punch/queue.rb', line 182

def shutdown
  synchronize { @running = false }
  @pool.shutdown
end