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In this chapter, we begin to discuss the ideas that are usually considered the most important components of the Service-Oriented Architecture (SOA) and related services-based application integration. However, recall that SOA also encompasses all the integration ideas we covered in s 3 6. Therefore, we will start this chapter with a recap of all the important ideas covered so far. Next, we describe the heterogeneity problem caused by the use of the various technologies described in s 3 6. As a solution to the heterogeneity problem, we discuss the Web Services standards and further development of technology in particular, the Enterprise Service Bus (ESB) pattern. In the remainder of this chapter, we briefly review each of these standards, including XML, SOAP, WSDL, UDDI, and WS-I Basic Profile. The next chapter deals with the Enterprise Service Bus pattern. Review of Part II (s 3 6) Part II of this book began by covering the methods applications use to share data only (refer to 3). We discussed three methods of exchanging data between applications: file-based data sharing, using a common database approach, and sockets. You learned that the first two approaches are suitable when the data need not be shared in real time, whereas the third approach, sockets, allows applications to share data in real time. Perhaps the most important thing you learned is the idea of the connectivity of applications through the use of sockets. Sockets not only allow applications to share data in real time, they are also fundamental to sharing functionality between applications. Sockets are always present in the background regardless of the integration approach being discussed. In 4 you learned about the remote procedure call (RPC) method of sharing functionality and data among applications. You learned that
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RPC (also known as client/server architecture), is built on top of sockets technology. RPC was an important step in the progress toward enterprise integration because it introduced some critical ideas and features, and for the first time outlined the basic steps necessary to share functionality among applications or software components. RPC introduced the following new features and ideas in the realm of enterprise integration:
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The concept of interface declaration through the use of a speci cation le. The RPC speci cation le may be considered the rst step in the development of the services interface, such as a WSDL le. The concept of a service provider application (called the server) and the service consumer application (called the client). The server provides the implementation of one or more functions that can be used or invoked by the client application. The concept of marshalling of arguments for transmission over the network. This refers to the packaging of arguments into one or more messages to be transmitted over the network. The encapsulation of all system- and network-related functionality in a library. This encapsulation led to future systems in which this functionality was separated out as a program of its own, thus leading to code reuse. Client and server stubs, which shield the programmer from the system and network calls. These stubs, in various forms, continue to be used even in a Service-Oriented Architecture. The concept of platform independence via the use of XDR (external data representation), which encodes the data in a machine-independent format.
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5 introduced the concept of distributed objects by moving away from procedural languages such as C and into the realm of objectoriented programming (OOP) and object-oriented design (OOD). In the case of distributed objects, the objects concept is generalized so that the objects can be distributed over a network. These objects are able to interact with each other through the use of a technology called CORBA. With distributed objects, we took a big step forward in application integration by encapsulating the code for parameter marshalling and unmarshalling and the code for networking into a separate software component (or application). We call this component the Object Request Broker (ORB). This remedies the problem of the lack of code reuse in RPC. Various implementation of ORB form the backbone of all the modern commercial application servers, which are needed to support distributed objects.
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