@@ -1,6 +1,9 @@
#!/usr/bin/env python
-'''http://www.slideshare.net/ishraqabd/publish-subscribe-model-overview-13368808'''
+'''
+Reference: http://www.slideshare.net/ishraqabd/publish-subscribe-model-overview-13368808
+Author: https://github.com/HanWenfang
class Provider:
def __init__(self):