CAMeL: A Self-Adaptive Framework for Enriching Context-Aware Middlewares with Machine Learning Capabilities

Listing 1

iPOJO module capable of acquiring a frame from a camera using OpenCV.

(1)	@Validate
(2)	public void start () throws Exception {
(3)	Thread t = new Thread (this);
(4)	t.start ();
(5)	}
(6)	@Invalidate
(7)	public void stop () {
(8)	stop = true;
(9)	}
(10)	public void run () {
(11)	FrameGrabber grabber = null;
(12)	try {
(13)	ProducerTemplate producer = context.getContext ().createProducerTemplate ();
(14)	//image grabbing via OpenCV API
(15)	grabber = FrameGrabber.createDefault (0);
(16)	grabber.start ();
(17)	IplImage grabbedImage = grabber.grab ();
(18)	while (stop == false && (grabbedImage = grabber.grab()) ! = null) {
(19)	//… creating imageData object
(20)	//send data to the “image” queue
(21)	producer.sendBody (imageSedaQueue, imageData);
(22)	}
(23)	grabber.stop ();
(24)	} catch (Exception e) {
(25)	//… exception handling
(26)	}
(27)	}