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With the advent of the procedural languages such as FORTRAN, C, COBOL, and BASIC, the most rudimentary form of service notion took hold. The code that needed to be repeated was separated out as a simple procedure, such as a method, function, or subroutine. This method/ function/subroutine could then be called by the computer code at different places to perform some service for the calling code. This increased the reusability of this portion of the code. Furthermore, the code could be easily maintained because the changes needed to be made only in one place instead of in several different places. It also increased the execution efficiency because the repeatable code exists only in one place in the address space of the computer s memory. An equally important benefit of this separation of repeating code in a method/function/ subroutine was that the repeating code became more accurate because it was tested over and over when called by the different portions of the computer program. After the procedural languages came object-oriented languages such as C++ and Java. Such programming languages introduced the concept of classes, which are encapsulated behavior and data. These classes can be used anywhere in the program. Because all the code is encapsulated in classes, which can be used anywhere in the program code, code reuse increased quite substantially. Although the introduction of procedural and object-oriented languages increased the reuse of code, the reuse was limited to individual computer programs or executables. In other words, the procedure (meaning the method, function, or subroutine) could not be used outside of the program that contained it. Because, as you will see in this book, services and Service-Oriented Architecture are mostly about application integrations which require the sharing of functionality and data across applications or computer programs these developments in programming languages did not directly contribute to the development of services and SOA as they are known today. Instead, the major and the most fundamental contribution to the development of the idea of a service and SOA came from distributed computing, which requires interapplication communications. Distributed computing started with the development of socket programming, which allowed applications to establish live connections and share data in real time. This establishment of connectivity through sockets was fundamental to the development of the idea of services and SOA. Because most, if not all, of the further development in services and SOA came on the top of sockets, it is hard to imagine that the current ideas of services and SOA would have evolved without the advent of sockets. Sockets only allowed data sharing they did not allow functionality sharing directly. Therefore, further developments were needed to allow
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applications to share functionality. This development came in the form of remote procedure call (RPC), which is also known as client/server programming. RPC is built on top of sockets and hides the low-level network programming that is required from the developer or programmer. In addition, concerning the sharing of functionality between applications, RPC also introduced a rudimentary way of declaring a service interface and the idea of platform independence through the use of XDR (see 4 for a description of XDR). After RPC came the Object Request Broker (ORB) technology, which introduced object-oriented programming ideas into the realm of distributed computing. In particular, ORB technology extended the idea of objects in object-oriented programming to remote objects, where the objects can reside in different applications running on different computers. ORB technology provided for these remote objects to communicate with each other. These remote objects were able to share functionality and data in much the same way as applications were able to share functionality and data in the case of RPC. The most well-known examples of ORB technologies are CORBA and Java RMI. CORBA, in particular, introduced a number of new ideas related to services and SOA, such as a language-independent service interface, the initial concept of a registry, and the separating into different applications of network-related functionality and the code for marshalling and unmarshalling, which enormously improved code reuse because the same code could be used by a number of different applications. Most of the current application servers, such as WebSphere Application Server and JBoss, are based on the ORB technology. In parallel with the development of ORB technology, asynchronous messaging was also developed. This technology also relied on sockets in the background but provided some advantages in terms of the scalability of application integration. This scalability primarily resulted from the asynchronous nature of the messaging, which allowed sending applications to continue their work without waiting for a response from the receiving application. What s more, this method of exchanging messages between applications used queues for sending and receiving messages. This indirect method of exchanging messages provided loose coupling between the sending and receiving applications. Yet another advantage is that the delivery of messages can be guaranteed by persisting them on both side of the network. Furthermore, synchronous messaging can be simulated by using correlation IDs to compare the request message to the response message. A closely related development was the development of message routers/brokers, which can route messages based on their content or context. Then came Web Services, which introduced standards in order to reduce the heterogeneity caused by the use of multiple technologies
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