Class: MessageBus::TimerThread

Inherits:
Object
  • Object
show all
Defined in:
lib/message_bus/timer_thread.rb

Defined Under Namespace

Classes: Cancelable, CancelableEvery

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ TimerThread

Returns a new instance of TimerThread.



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# File 'lib/message_bus/timer_thread.rb', line 33

def initialize
  @stopped = false
  @jobs = []
  @mutex = Mutex.new
  @next = nil
  @thread = Thread.new { do_work }
  @on_error = lambda { |e| STDERR.puts "Exception while processing Timer:\n #{e.backtrace.join("\n")}" }
end

Instance Attribute Details

#jobs ⇒ Object (readonly)

Returns the value of attribute jobs.



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# File 'lib/message_bus/timer_thread.rb', line 4

def jobs
  @jobs
end

Instance Method Details

#every(delay, &block) ⇒ Object 



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# File 'lib/message_bus/timer_thread.rb', line 61

def every(delay, &block)
  result = CancelableEvery.new
  do_work = proc do
    begin
      block.call
    ensure
      result.current = queue(delay, &do_work)
    end
  end
  result.current = queue(delay, &do_work)
  result
end

#on_error(&block) ⇒ Object 



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# File 'lib/message_bus/timer_thread.rb', line 106

def on_error(&block)
  @on_error = block
end

#queue(delay = 0, &block) ⇒ Object

queue a block to run after a certain delay (in seconds)



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# File 'lib/message_bus/timer_thread.rb', line 75

def queue(delay = 0, &block)
  queue_time = Process.clock_gettime(Process::CLOCK_MONOTONIC) + delay
  job = [queue_time, block]

  @mutex.synchronize do
    i = @jobs.length
    while i > 0
      i -= 1
      current, _ = @jobs[i]
      if current < queue_time
        i += 1
        break
      end
    end
    @jobs.insert(i, job)
    @next = queue_time if i == 0
  end

  unless @thread.alive?
    @mutex.synchronize do
      @thread = Thread.new { do_work } unless @thread.alive?
    end
  end

  if @thread.status == "sleep"
    @thread.wakeup
  end

  Cancelable.new(job)
end

#stop ⇒ Object 



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# File 'lib/message_bus/timer_thread.rb', line 42

def stop
  @stopped = true
  running = true
  while running
    @mutex.synchronize do
      running = @thread && @thread.alive?

      if running
        begin
          @thread.wakeup
        rescue ThreadError
          raise if @thread.alive?
        end
      end
    end
    sleep 0
  end
end