Change detection and notification
- Change detection and notification
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Internet change detection and notification (CDN) refers to automatic detection of changes made to World Wide Web pages and notification to interested users by email or other means. Whereas search engines are designed to find web pages, CDN systems are designed to monitor changes to web pages. Before change detection and notification, it was necessary for users to manually check for web page changes, either by revisiting web sites or periodically searching again. Efficient and effective change detection and notification is hampered by the fact that most servers do not accurately track content changes through Last-Modified or ETag headers.
History
In 1996, NetMind developed the first change detection and notification tool, known as Mind-it, which ran for six years. This spawned new services such as ChangeDetection.com (1999), ChangeDetect (2002) and Google Alerts (2004). Historically, change polling has been done either by a server which sent email notifications or a desktop program which audibly alerted the user to a change.
The prevalence of cloud computing and smartphones is changing the CDN market, namely how polling is done and how notifications are sent.[citation needed] A mobile CDN device with a cloud back end does not suffer from limited bandwidth, storage or processing power, and notifications are delivered to wherever the device is.[citation needed] One such service is dasPing (2011).
Three approaches
- A local application with a graphical user interface polls and tracks changes.
- A server polls, tracks changes and sends email notifications with a web browser user interface.
- A mobile device connects to a cloud server and can be notified in real time by the server when a change is detected.
References
- Chakravarthy, S.; Hara, S. C. H. (2006). Automating Change Detection and Notification of Web Pages (Invited Paper). pp. 465. doi:10.1109/DEXA.2006.34. edit
External links
Wikimedia Foundation.
2010.
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