May 2009
Beginner
271 pages
9h 38m
English
Content preview from Web 2.0 Architectures
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A New Client/Server Model for Web 2.0
Web 2.0 patterns of interaction are more elaborate than the simple request/response interaction patterns facilitated by the client/server model of the original Web. Common Web 2.0 practices require that interactions reach deeper and into more capabilities than the web applications of the past. Fortunately, one of the Web 2.0 patterns—Service-Oriented Architecture (SOA)—allows capabilities to be exposed and consumed via services across disparate domains of ownership, making it much easier for the other patterns to operate.
The evolution of the old client/server model into a five-tier model for Web 2.0, as shown in Figure 4-1, can be extended over time as new patterns and functionality are introduced into the equation. The Synchronized Web pattern, for example, requires that concepts such as connectivity and reachability be more carefully thought out in the core architecture, and these concepts need to be expanded to cover consistent models for objects, state, events, and more. The connectivity/reachability layer has to account for both online and offline states as well as the interactions between multiple agents or actors within a system’s architecture.
Figure 4-1. A model for Web 2.0
Note
Remember, Figure 4-1 is not an architecture; it’s an abstract model. The model’s purpose is to capture a shared conceptualization of the Internet as a platform for ...
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