Class: God::DriverEventQueue

Inherits:
Object
  • Object
show all
Defined in:
lib/god/driver.rb

Instance Method Summary collapse

Constructor Details

#initialize ⇒ DriverEventQueue

Returns a new instance of DriverEventQueue.



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# File 'lib/god/driver.rb', line 57

def initialize
  @shutdown = false
  @waiting = []
  @events = []
  @waiting.taint
  @events.taint
  self.taint
end

Instance Method Details

#clear ⇒ Object 



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# File 'lib/god/driver.rb', line 136

def clear
  @events.clear
end

#empty? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/god/driver.rb', line 132

def empty?
  @que.empty?
end

#length ⇒ Object Also known as: size 



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# File 'lib/god/driver.rb', line 140

def length
  @events.length
end

#num_waiting ⇒ Object 



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# File 'lib/god/driver.rb', line 146

def num_waiting
  @waiting.size
end

#pop ⇒ Object Also known as: shift, deq

Sleep until the queue has something due



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# File 'lib/god/driver.rb', line 84

def pop
  begin
    while (Thread.critical = true; @events.empty? or !@events.first.due?)
      @waiting.push Thread.current
      if @events.empty?
        raise ThreadError, "queue empty" if @shutdown
        Thread.stop
      else
        Thread.critical = false
        delay = @events.first.at - Time.now
        sleep delay if delay > 0
        Thread.critical = true
      end
    end
    @events.shift
  ensure
    Thread.critical = false
  end
end

#push(event) ⇒ Object Also known as: <<, enq

Add an event to the queue, wake any waiters if what we added needs to happen sooner than the next pending event



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# File 'lib/god/driver.rb', line 111

def push(event)
  Thread.critical = true
  @events << event
  @events.sort!
  begin
    t = @waiting.shift if @events.first == event
    t.wakeup if t
  rescue ThreadError
    retry
  ensure
    Thread.critical = false
  end
  begin
    t.run if t
  rescue ThreadError
  end
end

#shutdown ⇒ Object

Wake any sleeping threads after setting the sentinel



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# File 'lib/god/driver.rb', line 69

def shutdown
  @shutdown = true
  begin
    Thread.critical = true
    @waiting.each do |t|
      t.run
    end
  ensure
    Thread.critical = false
  end
end