visual basic barcode generator Sockets and Data Sharing in Java

Making PDF-417 2d barcode in Java Sockets and Data Sharing

Sockets and Data Sharing
Decoding PDF417 In Java
Using Barcode Control SDK for Java Control to generate, create, read, scan barcode image in Java applications.
Draw PDF-417 2d Barcode In Java
Using Barcode creator for Java Control to generate, create PDF 417 image in Java applications.
Although data sharing through files may be the most common method of sharing data between applications, this method has a number of disadvantages. The most important disadvantage of this method is that the data is not shared in real time. Generally a substantial lag exists between the time that one application writes to a file and the time the second application reads from the file. This lag in time is usually determined by a business cycle, which may be a few hours, a day, or a week. Many times this lag in reading is not a problem, in which case it is proper to rely on this method of data sharing. However, in many other cases the lag in time is a serious problem, which makes this method of sharing data unsuitable in such circumstances. Consider the situation where a business client has changed their address and reports that change to the business through Application A, which then writes this change of address to a file for Application B to read. However, Application B reads such files only once a week. In the meantime, Application B sends a bill to the wrong address. Thus, the bill might not get paid in time or even paid at all. In such situations, the staleness of data is a serious problem. Another serious problem with file-based data transfer between applications is that this method is unreliable if a large number of files are involved. File-based data transfer requires a substantial amount of bookkeeping, including when and how to delete files, and a locking mechanism so that a given file is not read from and written to at the same time. These and other issues are discussed further in the next paragraph. The bookkeeping tasks that need to be performed for file-based data sharing significantly increase the workload for the software developers. These tasks include the following:
Reading PDF-417 2d Barcode In Java
Using Barcode reader for Java Control to read, scan read, scan image in Java applications.
Barcode Printer In Java
Using Barcode encoder for Java Control to generate, create bar code image in Java applications.
The software developers for both the application writing to the le and the application reading from the le must agree on the format of the le. The software developers for both the application writing to the le and the application reading from the le must agree on a le-naming convention. The software developers must agree on the directory in which the le must be created and/or transferred if need be. Software developers for data-sharing applications must agree on the application responsible for deleting the le when it is no longer needed. Software developers must implement a locking mechanism that disallows other applications from reading from the le when one application is writing to the le.
Bar Code Scanner In Java
Using Barcode recognizer for Java Control to read, scan read, scan image in Java applications.
PDF-417 2d Barcode Generation In C#.NET
Using Barcode printer for Visual Studio .NET Control to generate, create PDF417 image in Visual Studio .NET applications.
Three
PDF417 Creation In Visual Studio .NET
Using Barcode creator for ASP.NET Control to generate, create PDF-417 2d barcode image in ASP.NET applications.
PDF417 Generation In VS .NET
Using Barcode generator for .NET framework Control to generate, create PDF-417 2d barcode image in VS .NET applications.
If the two applications sharing data through les are running on two different servers (machines), the software developers must decide on which application will be responsible for transferring les from one server to the other.
PDF417 Printer In VB.NET
Using Barcode drawer for VS .NET Control to generate, create PDF417 image in .NET applications.
European Article Number 13 Creation In Java
Using Barcode generator for Java Control to generate, create EAN-13 Supplement 5 image in Java applications.
Sharing data using files is straightforward when the data is in text form. However, if the data is numerical, you must account for the two systems used: big endian and little endian. For example, SPARC is big endian whereas Intel is little endian. In this case, you must explicitly program to account for this difference, which is commonly known as the big endian versus little endian issue. Another serious problem with this type of data integration is that the method is not suitable when a large number of applications need to be integrated because this type of integration is point to point. The number of point-to-point integrations basically increases as follows: N(N 1) / 2 In this calculation, N is the number of applications involved in the integration. Common Database This method of sharing data between applications is similar to the previous file-based data-sharing method. In this case, one application writes data to a common database, and other applications read the data from that database. This is shown schematically in Figure 3.3. An important difference from file-based data sharing to note from this figure is that the database almost always runs on its own separate machine. This means the data transfer between applications always occurs via a network, even though the applications sharing the data might be running on the same machine. Therefore, this method of sharing data is generally slower than the file-based method. An advantage of this method of data sharing is that the connection between applications in not point to point, as is the case for file-based data sharing. Any number of applications can share data once it is written to the database. Thus, the data is always consistent across any number of applications. The use of a common database for application integration is popular due to the widespread use of SQL-based relational databases. Almost all development platforms support SQL, so you don t need to worry about multiple file formats. Therefore, once you learn SQL, you can use it on all different platforms. Some sample code for reading from a database in Java is shown in Listing 3-6. In this sample code, an application reads the names and phone numbers of employees from a database and displays them on
Print GTIN - 12 In Java
Using Barcode drawer for Java Control to generate, create UPC-A Supplement 5 image in Java applications.
Data Matrix Maker In Java
Using Barcode creator for Java Control to generate, create DataMatrix image in Java applications.
International Standard Book Number Encoder In Java
Using Barcode encoder for Java Control to generate, create Bookland EAN image in Java applications.
Code-39 Decoder In None
Using Barcode recognizer for Software Control to read, scan read, scan image in Software applications.
Decode Bar Code In Java
Using Barcode scanner for Java Control to read, scan read, scan image in Java applications.
1D Generation In Visual Basic .NET
Using Barcode encoder for .NET framework Control to generate, create 1D Barcode image in .NET applications.
Print Code 128 Code Set B In None
Using Barcode creation for Font Control to generate, create Code 128B image in Font applications.
Barcode Generation In Objective-C
Using Barcode encoder for iPhone Control to generate, create bar code image in iPhone applications.
Creating EAN13 In None
Using Barcode printer for Font Control to generate, create EAN-13 image in Font applications.
Bar Code Recognizer In Visual Basic .NET
Using Barcode decoder for VS .NET Control to read, scan read, scan image in .NET framework applications.
Copyright © OnBarcode.com . All rights reserved.