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What are some popular Web service integration approaches?

What are some popular Web service integration approaches?
When applying Web services technology to solve application integration problems, there are patterns or architectures to consider as well. These are:

1. event-driven
2. composite; and
3. autonomous-distributed.

It's also correct to consider these solution patterns as an evolution of the Web services integration technology over time, as well as options.
Event-driven Web services solutions refer to those architectures that deal more with information movement than application service aggregation. Data moves from system to system in support of a particular business transaction, but there is also a requirement to access application services. For instance, moving order information from system to system and company to company to support the purchase of a car, or employing a common Web service to calculate logistics information, sharable by all source and target systems. This is a hybrid architecture that mixes both Web services and traditional application integration technology, such as integration servers.

Composite application solutions refer to architectures that require many application services to aggregate into a single instance of an application. Organizations have been dealing with this paradigm for years as component-oriented programming, where many predefined application components combine to create a single application. However, within the notion of Web services, the application components reside on a remote computer, and the Web services are accessed as pieces of an application. For instance, the master application that monitors shipments invokes a series of Web services (running on remote computers) that provide application services for logistics processes, least-cost routing, billing, etc. Going forward this will be the most popular architecture for Web services since it's closest to the concept.

Autonomous-distributed solutions refer to those architectures where the Web services are so tightly coupled that they appear as a single application. This is the final destination for Web services, binding many applications together, inter- and intracompany, into a single unified whole. However, the proliferation of this architecture is years away.

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