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(such as RPC, ORBs, and messaging). Specifically, they introduced a standard, middleware-independent data format called the Extensible Markup Language, or simply XML. In addition, the previous services interface definitions were refined by introduction of WSDL (Web Services Description Language), which allowed the services interface to be declared in a language-, platform-, and middleware-independent form. Similarly, the previous ideas of service registry were refined by the introduction of Universal Description, Discovery, and Integration (UDDI) interface. Finally, a standard format for message exchange was introduced in the form of SOAP. In many cases, it was soon discovered that Web Services alone were not enough to deal with all the heterogeneity problems. In particular, Web Services were not able to handle the situation of a communication protocol mismatch between the service provider and the service consumer. Similarly, Web Services were unable to provide a satisfactory solution for a mismatch of the data/message format between the service provider and service consumer. Enterprise Service Bus (ESB) came to the rescue. An ESB provides many functions, including protocol and message transformation, message routing based on content and context, location transparency, Quality of Service (QoS), data enrichment, and other functions. We will discuss these functions in detail in 8. In addition to Web Services, which employ new applications and the Enterprise Service Bus, SOA must provide a means of integrating existing applications (such as legacy mainframe applications and package applications) in order to offer a complete integration solution for an enterprise. Many times this requires wrapping existing applications into Web Services or using adapters, which allow these existing applications to communicate with other, more modern applications. We discuss in detail the integration of mainframe and packaged applications in s 9 and 10 of this book. Web Services standards are discussed in detail in s 11 14, whereas the creation of new Web Services is described in 15. To conclude this section, refer to Figure 2.1 for a summary of the development of services and SOA. This figure shows the contributions made by different distributed technologies to the development of SOA. It also shows the many earlier technologies SOA has embraced, starting from sockets. Business Problem Addressed by SOA SOA addresses a very common and specific business problem. In the past, business requirements did not change very fast. The product line offered by a company and the methods of marketing and selling those products were fixed. Therefore, IT requirements were also more or less fixed.
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SOA Protocol transformation Data/message transformation Content or context based routing QoS
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Middleware-independent data format (XML) Refined concept of registry Refined interface definition SOAP
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Separate component for network and marshalling functionalities Scalable connectivity Guaranteed delivery Language-independent interface Initial concept of registry Separate component for network and marshalling functionalities
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Sockets
Connectivity Real-time data sharing
Evolution of services-based integration and SOA. The contributions of various distributed technologies are shown in yellow boxes.
However, in the 1990s this situation changed. The lifetime of a product became shorter and the organization started to change very quickly. There are five main reasons for these changes:
Mergers This refers to two or more companies or organizations joining to form a single, new company.
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Acquisitions This refers to a company increasing its size substantially by buying or acquiring another company. Changing market conditions In particular, this involves the fast introduction of new products and the repackaging of existing products in order to survive in a highly competitive market. New technological advances Advances such as the Internet and voice response systems provided new opportunities for marketing, sales, and procurements. The nature of business relationships A large organization typically has many relationships with external business entities such as business partners and suppliers. These relationships are uid in nature and frequently change.
These fast-changing business conditions meant that the requirements for the IT systems that supported these business operations also started to change very quickly. In the past, applications were developed to address a specific business need. This required developers to make assumptions related to the problem being solved, the data being used, and the hardware on which the software was supposed to run. New problems required the development of new programs. However, the fastchanging IT requirements meant that the old methods of developing and deploying software systems were no longer sufficient due to the difficulty in developing a large number of computer programs in a short period of time. A new approach was needed to provide flexible, agile IT systems that could meet the fast-changing business needs of the time. As an answer to this problem, SOA emphasizes agile IT systems through the use of reusable components. In this architecture, computer programs or components are not developed to solve a specific business problem. Instead, they provide some generic functionality. Then, these components can be threaded, linked, or integrated in a specific order or configuration to meet a specific business need. If the business requirement changes, there s no need to develop a new computer program. Instead, the system can be reconfigured to meet the new business requirement. This is illustrated in Figures 2.2 and 2.3. Figure 2.2 shows a particular configuration of reusable software components that meets a specific
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