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A loosely coupled arrangement of reusable components
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Component D New Component
Figure 2.3 A recon guration of reusable components for changing requirements
business need for a given time period. Figure 2.3 shows that the same components can be reused in a different configuration to meet the changing business needs. Perhaps an analogy will help to make this point clear. In this analogy, the old approach of developing a new application whenever the business requirements change corresponds to neon sign technology, which can advertise only a fixed commercial product. If the product changes, the old neon sign must be discarded and a new neon sign designed and built. On the other hand, the new SOA approach can be compared to a changeable letter board, which employs reusable letters. These letters can be configured to advertise one product today, and if the product changes tomorrow, the letters can be easily rearranged to advertise the new product. This analogy also helps to explain another important aspect of SOA: reusability. This aspect relates to the concept of loose coupling. Using the preceding example, notice that we cannot reuse the letters in the neon sign technology because they are strongly linked or coupled. In other words, we cannot easily separate the letters in a neon sign. On the other hand, in the case of the changeable letter board, there is very little (or loose ) coupling between the letters. That is the reason we can separate the letters easily and then reconfigure them to meet changing requirements on a short notice. In addition to providing agility to IT systems to meet changing business needs, reusable components offer the following advantages:
They save development and testing time and resources because few, if any, new components need to be developed if the requirements change. They provide more consistent functionality and data to the internal and external consumers by eliminating redundant code. The code is easy to maintain because changes can be localized to one place in a component.
Overview and Basic Concepts
The code is well tested because it is used many times in different arrangements and situations.
De nitions A number of terms are important in discussing the subjects of services and SOA. However, some variations in the use of these terms exist. In other words, these terms have been used with slightly different meanings in the past. Therefore, in order to avoid confusion, this section provides concrete definitions of these important terms to give you a more consistent picture of services and SOA. The second reason for discussing these terms this early in the book is that you might not be familiar with these terms. If this is the case, you will find these descriptions helpful as a way of introduction to the ideas these terms represent. We ll start with the most simple of these terms (but still very important): application.
Application
The term application has different meanings in different contexts. Some define an application as a single computer program, which means a single executable. Others define an application as a collection of more than one computer program that work together to provide some functionality. Such is the case for many Internet-based applications. However, in this book we will use the term in the more restricted sense to mean only a single executable or computer program. This will help avoid any confusion concerning its usage.
Distributed Computing
By distributed computing, we always mean more than one application (or executable). These programs or applications typically run on separate hardware or machines, but they work together to achieve some function. The different applications running on different computers use some method of communicating among themselves over a computer network. Some of these communication methods include sockets, RPC, ORBs, and asynchronous messaging. We will discuss these methods of communication in detail later in this book.
Enterprise
Among other definitions, the Merriam-Webster online dictionary provides two meanings of enterprise that are relevant for our discussion. The first is a business entity, and the second is a project or undertaking that is especially difficult, complicated, or risky. These two definitions taken together give a good sense of the entities we are interested in. To be
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