Class: Merb::Worker

Inherits:

Object

• Object
• Merb::Worker

show all

Defined in:

merb-core/lib/merb-core/dispatch/worker.rb

Instance Attribute Summary (collapse)

• - (Object) thread private

Class Method Summary (collapse)

• + (Boolean) alive? private

  Whether the Merb::Worker instance thread is alive.

• + (Merb::Worker) restart private

  restarts the worker thread.

• + (Merb::Worker) start private

  Instance of a worker.

• + (Boolean) started? private

  Whether the Merb::Worker instance is already started.

Instance Method Summary (collapse)

• - (Worker) initialize constructor private

  Creates a new worker thread that loops over the work queue.

• - (Object) process_queue private

  Processes tasks in the Merb::Dispatcher.work_queue.

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# File 'merb-core/lib/merb-core/dispatch/worker.rb', line 56

def initialize
  @thread = Thread.new do
    loop do
      process_queue
      break if Merb::Dispatcher.work_queue.empty? && Merb.exiting
    end
  end
end

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# File 'merb-core/lib/merb-core/dispatch/worker.rb', line 5

def thread
  @thread
end

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# File 'merb-core/lib/merb-core/dispatch/worker.rb', line 34

def alive?
  started? and @worker.thread.alive?
end

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# File 'merb-core/lib/merb-core/dispatch/worker.rb', line 43

def restart
  # if we have a worker or thread, kill it.
  if started?
    @worker.thread.exit
    @worker = nil
  end
  start
end

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# File 'merb-core/lib/merb-core/dispatch/worker.rb', line 11

def start
  @worker ||= new
  Merb.at_exit do
    if Merb::Dispatcher.work_queue.empty?
      @worker.thread.abort_on_exception = false
      @worker.thread.raise
    else
      @worker.thread.join
    end
  end
  @worker
end

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# File 'merb-core/lib/merb-core/dispatch/worker.rb', line 27

def started?
  !@worker.nil?
end

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# File 'merb-core/lib/merb-core/dispatch/worker.rb', line 68

def process_queue
  begin
    while blk = Merb::Dispatcher.work_queue.pop
       # we've been blocking on the queue waiting for an item sleeping.
       # when someone pushes an item it wakes up this thread so we
       # immediately pass execution to the scheduler so we don't
       # accidentally run this block before the action finishes
       # it's own processing
      Thread.pass
      blk.call
      break if Merb::Dispatcher.work_queue.empty? && Merb.exiting
    end
  rescue Exception => e
    Merb.logger.warn! %Q!Worker Thread Crashed with Exception:\n#{Merb.exception(e)}\nRestarting Worker Thread!
    retry
  end
end