Web Services Development
Web Services today are frequently just Application Programming Interfaces (API) or Web Application Programming Interfaces (WAPIs) that can be accessed over an Internet, and executed on a remote system hosting the requested services. Web services provide a standard way to implement a business function that can be invoked remotely. They support interoperability by separating the mechanisms of access from the implementation. For this reason, Web services are the de facto standard for implementing an SOA that requires a loose coupling between a requester and a provider. The development tools industry quickly jumped onto the web services bandwagon and provided mechanisms for developing web services. These mechanisms can now be formalized into a set of development patterns for web services. Each of these patterns has advantages and disadvantages that determine which pattern should be used in a given situation.

Bottom-up approach
The advantages of the bottom-up approach are:
  • It is a quick way to expose legacy implementations as web services.
  • It requires little or no knowledge of Web Services Description Language(WSDL) or Extensible Markup Language(XML) because the WSDL document is generated by the tools.
  • It has excellent tools support. In fact the sophisticated tools do all the work to create a deployable, executable web service implementation on the provider side and all the work to allow a request to access the implementation on the requester side.
Top-down approach
The advantages of the top-down approach are:
  • It supports the use of existing standards-based XSD types.
  • When new schema types are developed for the current service, they can be easily reused for other services by simply importing the newly developed XSD into the other services.
  • It allows for parallel and independent development of client-side and server-side.
  • Incremental changes to the service are best managed by changing the WSDL itself. Since the WSDL is the common interface (or contract) for both the client-side and server-side, these changes can be easily managed so they don't affect interoperability with existing requesters or providers.
  • The tools will use the name-spaces defined in the WSDL to determine the package names of the generated JavaBeans(or DTOs). Most of the tools support name-space to package name mappings. The advantage with starting from Web Services Description Language is that both the client-side and server-side can use different package name mappings without affecting the access of the service.
Round-trip approach
The primary advantage of the approach is that you can use it to circumvent tooling problems or to compensate for insufficient knowledge of web services tools and technologies. This approach allows customization of an existing schema and web service via code changes rather than schema changes. You can also use it if the tooling does not support implementation of the service in the desired form, such as an Enterprise JavaBean(EJB). The bottom-up pattern is the best approach for exposing existing function as a web service. The top-down pattern offers the most flexibility and reusability, and is rapidly approaching the status of a best practice when developing new web services. The round-trip pattern can be used as an aide when one of the better methods cannot be used.

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