With SOA, the services you consume are typically developed by your organization or a close business partner, so you can assume they have standards similar to your own. But when you adopt APIs, you usually have no visibility into how solidly the services were built—or when and how they are evolving. How should you properly vet an external API?
Most organizations have accepted the commercial benefits of using enterprise service bus-based integration products in their software projects. However, the industry expectations for an ESB product are ever increasing. This article will explain how vendors are trying to cope with the demand.
Building on a May 2007 Better Software magazine article by Dan North, this month’s cover story continues a look inside service-oriented architecture that emphasizes the process that defines the services rather than the technical specifics. However, this article does use standard technologies—Java, XML, SOAP, WSDL, and POX to further describe a practical implementation of the vacation-booking service described in Dan’s article.