Class: Merb::Worker

Inherits:
Object show all
Defined in:
lib/merb-core/dispatch/worker.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Worker

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

:api: private



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# File 'lib/merb-core/dispatch/worker.rb', line 60

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

Instance Attribute Details

#thread ⇒ Object

:api: private



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

def thread
  @thread
end

Class Method Details

.alive? ⇒ Boolean

Returns

Whether the Merb::Worker instance thread is alive

:api: private

Returns:

  • (Boolean) 


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# File 'lib/merb-core/dispatch/worker.rb', line 37

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

.restart ⇒ Object

restarts the worker thread

Returns

Merb::Worker

instance of a worker.

:api: private



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# File 'lib/merb-core/dispatch/worker.rb', line 47

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

.start ⇒ Object

Returns

Merb::Worker

instance of a worker.

:api: private



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# File 'lib/merb-core/dispatch/worker.rb', line 12

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

.started? ⇒ Boolean

Returns

Whether the Merb::Worker instance is already started.

:api: private

Returns:

  • (Boolean) 


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# File 'lib/merb-core/dispatch/worker.rb', line 29

def started?
  !@worker.nil?
end

Instance Method Details

#process_queue ⇒ Object

Processes tasks in the Merb::Dispatcher.work_queue.

:api: private



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# File 'lib/merb-core/dispatch/worker.rb', line 72

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