By Alex Nghiem
In IT internet companies, best net companies integrator Alex Nghiem bargains a accomplished, up to date roadmap for each CIO, CTO, strategist, architect, and IT decision-maker. This book's targeted 360 measure view of may also help you objectively examine architectures, systems, and company types alike - and its broad early-adopter interviews supply exceptional perception into the realities of deployment. The incorporated CD-ROM encompasses a 1-year developer license to Iona's XMLBus internet companies platform.
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Extra info for IT Web Services: A Roadmap for the Enterprise
The servlet engine then invokes the servlet and returns the value to the client. • Enterprise Java Beans (EJBs) represent a component model for capturing business logic and can be one of four categories: - Stateless Session Bean is an abstraction representing the session of a user with a server. A stateless Session Bean stores the state of the session but only for the current method invocation. - Stateful Session Bean is similar to a stateless Session Bean except it stores the state of the request between method invocations.
The lack of Web Services transactional standards will not be a huge deterrent here since many information portals are not transactional in nature. Figure 2-9 illustrates how Web Services are used with an enterprise portal. Figure 2-9. Portal integration via SOAP. Phase II (2003 2005) As the standards mature (especially regarding security, messaging, and transaction control), organizations will start integrating business processes and applications beyond the firewall. Workflow standards will also mature to the point where organizations can build sophisticated, collaborative systems with trading partners.
TheHomeDepot. The sequence for the publish-subscribe model is • The system administrator specifies which topics the subscribers can access. • The subscriber registers a callback (a message handler to be invoked when a message is broadcast). • The publisher creates a message and sends it to a topic. • The integration broker delivers the message to the appropriate subscribers, which results in invoking the appropriate callback of each subscriber. Each subscriber is then free to perform unique processing on the message.
IT Web Services: A Roadmap for the Enterprise by Alex Nghiem