About the example code - DCNSFog.java : Comment mistake should be fixed up.

[songyuanli-test]

In line 252:
application.addTupleMapping("object_detector", "MOTION_VIDEO_STREAM", "DETECTED_OBJECT", new FractionalSelectivity(0.05)); // 0.05 tuples of type MOTION_VIDEO_STREAM are emitted by Object Detector module per incoming tuple of type MOTION_VIDEO_STREAM

should be corrected as

application.addTupleMapping("object_detector", "MOTION_VIDEO_STREAM", "DETECTED_OBJECT", new FractionalSelectivity(0.05)); // 0.05 tuples of type DETECTED_OBJECT are emitted by Object Detector module per incoming tuple of type MOTION_VIDEO_STREAM