TAILIEUCHUNG - Building Web Reputation Systems- P23

Building Web Reputation Systems- P23:Today’s Web is the product of over a billion hands and minds. Around the clock and around the globe, people are pumping out contributions small and large: full-length features on Vimeo, video shorts on YouTube, comments on Blogger, discussions on Yahoo! Groups, and tagged-and-titled bookmarks. User-generated content and robust crowd participation have become the hallmarks of Web . | message to the Yahoo Profiles karma model without knowing the address for the dispatcher it can just send a message to the one for its own framework and know that the message will get relayed to the appropriate servers. Note that a registration service such as the one described for the dispatch consumer is required to support this functionality. There can be many message dispatchers deployed and this layer is a natural location to provide any context-based security that may be required. Since changes to the reputation database come only by sending messages to the reputation framework limiting application access to the dispatcher that knows the names and addresses of the contextspecific models makes sense. As a concrete example only Yahoo Travel and Local had the keys needed to contact and therefore make changes to the reputation framework that ran their shared model but any other company property could read their ratings and reviews using the separate reputation query layer see Reputation query interface on page 298 . The Yahoo Reputation Platform s dispatcher implementation was optimistic all application API calls return immediately without waiting for model execution. The messages were stored with the dispatcher until they could be forwarded to a model execution engine. The transport services used to move messages to the dispatcher varied by application but most were proprietary high-performance services. A few models such as Yahoo Mail s Spam IP reputation accepted inputs on a best-effort basis which uses the fastest available transport service. The Yahoo Reputation Platform high-level architectural layer cake shown in Figure A-1 contains all the required elements of a typical rep- f utation framework. New framework designers would do well to start with that design and design select implementations for each component to meet their requirements. Model execution engine. Figure A-3 shows the heart of the reputation framework the model execution engine which manages

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