visual basic barcode generator Sockets and Data Sharing in Java

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Sockets and Data Sharing
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Client-side code ow for sharing data in real time between applications using
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There are a number of shortcomings of the socket programming approach, including the following:
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The major problem with socket programming is that only data can be shared directly, not the functionality. The API for socket programming is rather low level and is therefore dif cult to use. Because the API is low level, socket programming is not suitable for dealing with complex data types. The connectivity code is buried in the applications and cannot be easily reused. Socket programming is not platform independent if numeric quantities are involved. This is because applications on both ends must explicitly account for the byte ordering differences (little endian versus big endian) on different platforms such as mainframe and UNIX. Tight coupling exists between the two applications because the socket connection is point to point.
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In spite of these shortcomings, sockets are the most essential element of many other integration schemes that allow applications to share functionality in addition to data. As you will see in the next chapter, the remote procedure call (RPC) method of sharing functionality is built on top of sockets. Furthermore, distributed objects and asynchronous messages also rely on sockets. These two methods of sharing functionality are discussed in s 5 and 6.
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Three
Application A
Shared Memory
Application B
Two applications exchanging data by using a common area in memory (RAM)
Note that if the applications are running on the same machine and using the same operating system, there are three other ways of sharing data especially if the operating system being used is some form of UNIX/Linux. These three methods are shared memory, pipes, and name pipes (or FIFO). Shared memory may be simultaneously accessed by multiple programs, with the intent to provide communication among them. One process or application will create an area in RAM that the other applications can access. This is shown schematically in Figure 3.6. Shared memory is probably the fastest way to share data in real time. Shared memory remains in existence until the system reboots. Pipes and FIFO are similar but they remain in existence only until the last application that is holding the object open finally closes it. It should be noted that the use of shared memory requires both applications to be running on the same server. Conclusion In this chapter we discussed three methods of sharing data between applications: the file-based method, the use of a common database, and sockets. The first two methods do not allow for sharing data in real time, but the third method (sockets) does. While discussing sockets, we introduced the important concept of connectivity between applications. The major drawback of these three methods is that they do not allow the applications to share functionalities. In the next chapter, we will further develop the concept of connectivity between applications to allow applications to share functionalities as well as data among themselves in real time. We have discussed a number of other disadvantages of the three methods of sharing data. In later chapters, we cover other methods of integrations, which progressively remedy these shortcomings.
Remote Procedure Call (RPC)
In 3, we discussed techniques for sharing data between applications. The first two techniques the file-based data transfer and the use of a common database are suitable for sharing data when there s no requirement for sharing data in real time. The third technique using sockets is employed when data needs to be shared by applications in real time. Sockets can be used when the applications are running on the same machine or on different machines connected by a network. In 3, we also briefly mentioned pipes and FIFO, which can be used by applications running on the same machine for sharing data in real time. All these techniques are restricted to sharing data only and do not allow applications to share functionality. However, our discussion of sockets introduced the concept of connectivity between applications, which is required for sharing functionality. Therefore, sockets are almost always involved in the background when applications are sharing functionality, regardless of the method of integration. In this chapter we begin to address the core subject of this book: how to integrate enterprise applications so that they can share functionality. We start by describing techniques that allow functions defined in one application to be called by other applications in an enterprise. Note that the terms methods and procedures have the same meaning as the term functions in this book. Remember that enterprise applications integration is a difficult process because it involves many different types of applications written in many different languages and running on many different types of platforms, which may be distributed geographically. To understand the underlying problems and their solutions, a step-by-step approach is the best approach. Therefore, the methods described in this chapter should be considered a first step in the study of
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