tailieunhanh - Introduction to Web Services

The domain of web services is an emerging technology due to the growing demand of application-to-application communication and interoperability. The reason for its popularity is because of its flexible nature, since it exhibits itself as a standard interface which is not only platform-independent but technology independent as well. We'll talk more about this later. | 1. Introduction to Web Services Objectives Towards the end of the chapter you should be able to learn the following Determine what web services are Identify the characteristics of a web service and how it works Point out the need for web services Introduction The domain of web services is an emerging technology due to the growing demand of application-to-application communication and interoperability. The reason for its popularity is because of its flexible nature since it exhibits itself as a standard interface which is not only platform-independent but technology independent as well. We ll talk more about this later. This chapter will cover the evolution of network computing an overview of how the web service model came to be the definition of web services its properties and and what states or scenes are they applicable to. And lastly the discussion of the current status of web services and where it is heading. How did web services came to be A History of Distributed Computing During the prehistoric era in software services computer programs were written in assembly and are executed using single memory space see Figure 1 . The software s subroutines communicate digitally using the machine s registers. Programmers during this time find it hard to write more so maintain codes. Shortly after assembly came procedural languages such as COBOL C and FORTRAN which allowed programs to be written more easily than their forerunner since they resemble more the human language. Moreover these procedural languages allow programs to run on different machines. The software service during this time were functions that were directed by the use of control structures. Although this is a technological advancement in computing it is no different with assembly in the sense that programs are executed in single memory space. 1 of 14 Communication in single memory space in the same computer The next generation was the development of network computing wherein .

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