zxing pdf417 c# DIS TRIBUTED ARC HITE CTURE in C#.NET

Make PDF417 in C#.NET DIS TRIBUTED ARC HITE CTURE

CHAPTER 1 DIS TRIBUTED ARC HITE CTURE
PDF417 Generator In C#
Using Barcode generation for .NET framework Control to generate, create PDF 417 image in Visual Studio .NET applications.
www.OnBarcode.com
PDF417 Recognizer In Visual C#.NET
Using Barcode reader for .NET framework Control to read, scan read, scan image in .NET framework applications.
www.OnBarcode.com
maintenance nightmare. You can separate these two layers through techniques such as clearly defined procedural models or object-oriented design and programming. In this book, I ll show how to use object-oriented concepts to help separate the business logic from the interface. It is important to recognize that a typical application will use business logic in a couple of different ways. Most applications have some user interaction, such as forms in which the user views or enters data into the system. Most applications also have some very non-interactive processes, such as posting invoices, relieving inventory, or calculating insurance rates. Ideally, the Business layer will be used in a very rich and interactive way when the user is entering data directly into the application. For instance, when a user is entering a sales order, she expects that the validation of data, the calculation of tax, and the subtotaling of the order will happen literally as she types. This implies that the Business layer can be physically deployed on the client workstation or on the web server to provide the high levels of interactivity users desire. To support non-interactive processes, on the other hand, the Business layer often needs to be deployed onto an application server, or as close to the database server as possible. For instance, the calculation of an insurance rate can involve extensive database lookups along with quite a bit of complex business processing. This is the kind of thing that should occur behind the scenes on a server, not on a user s desktop. Fortunately, it is possible to deploy a logical layer on multiple physical tiers. Doing this does require some up-front planning and technical design, as you ll see in 2. The end result, however, is a single Business layer that is potentially deployed on both the client workstation (or web server) and on the application server. This allows the application to provide high levels of interactivity when the user is working directly with the application, and efficient back-end processing for non-interactive processes.
Generating Barcode In C#
Using Barcode printer for .NET Control to generate, create Barcode image in .NET applications.
www.OnBarcode.com
Encoding Code 128A In C#
Using Barcode creation for Visual Studio .NET Control to generate, create Code 128C image in .NET framework applications.
www.OnBarcode.com
Data Access
Drawing 1D In Visual C#.NET
Using Barcode drawer for VS .NET Control to generate, create Linear image in VS .NET applications.
www.OnBarcode.com
Matrix Maker In Visual C#
Using Barcode encoder for .NET framework Control to generate, create 2D image in .NET applications.
www.OnBarcode.com
Data access code interacts with the Data Storage and Management layer to retrieve, insert, update, and remove information. The Data Access layer doesn t actually manage or store the data; it merely provides an interface between the business logic and the database. Data access gets its own logical layer for much the same reason that the interface is split from interface control. In some cases, data access will occur on a machine that s physically separate from the one on which the interface and/or business logic is running. In other cases, data access code will run on the same machine as the business logic (or even the interface) in order to improve performance or fault tolerance.
European Article Number 13 Creation In C#.NET
Using Barcode creator for .NET framework Control to generate, create UPC - 13 image in .NET applications.
www.OnBarcode.com
MSI Plessey Creator In Visual C#.NET
Using Barcode printer for .NET framework Control to generate, create MSI Plessey image in .NET applications.
www.OnBarcode.com
Note
PDF 417 Reader In .NET Framework
Using Barcode recognizer for .NET framework Control to read, scan read, scan image in .NET framework applications.
www.OnBarcode.com
PDF 417 Encoder In None
Using Barcode generation for Word Control to generate, create PDF-417 2d barcode image in Word applications.
www.OnBarcode.com
It may sound odd to say that putting the Data Access layer on the same machine as the business logic can increase fault tolerance, but consider the case of web farms, in which each web server is identical to all the others. Putting the data access code on the web servers provides automatic redundancy of the Data Access layer along with the Business and Interface layers.
ECC200 Generation In Java
Using Barcode printer for Java Control to generate, create DataMatrix image in Java applications.
www.OnBarcode.com
Barcode Creator In VB.NET
Using Barcode printer for .NET framework Control to generate, create Barcode image in Visual Studio .NET applications.
www.OnBarcode.com
Adding an extra physical tier just to do the data access makes fault tolerance harder to implement, because it increases the number of tiers in which redundancy needs to be implemented. As a side effect, adding more physical tiers also reduces performance for a single user, so it s not something that should be done lightly.
Barcode Decoder In Visual C#
Using Barcode Control SDK for .NET Control to generate, create, read, scan barcode image in Visual Studio .NET applications.
www.OnBarcode.com
EAN128 Encoder In .NET Framework
Using Barcode generation for ASP.NET Control to generate, create UCC - 12 image in ASP.NET applications.
www.OnBarcode.com
Logically defining data access as a separate layer enforces a separation between the business logic and any interaction with a database (or any other data source). This separation provides the flexibility to choose later whether to run the data access code on the same machine as the business logic, or on a separate machine. It also makes it much easier to change data sources without affecting the application. This is important because it enables switching from one database vendor to another at some point.
Barcode Generator In Java
Using Barcode generation for Android Control to generate, create Barcode image in Android applications.
www.OnBarcode.com
Encode Code 39 In None
Using Barcode generator for Online Control to generate, create Code 39 Full ASCII image in Online applications.
www.OnBarcode.com
Recognizing Barcode In Visual Basic .NET
Using Barcode scanner for .NET Control to read, scan read, scan image in .NET applications.
www.OnBarcode.com
EAN 13 Generation In VB.NET
Using Barcode generator for Visual Studio .NET Control to generate, create UPC - 13 image in .NET applications.
www.OnBarcode.com
Barcode Decoder In Visual Basic .NET
Using Barcode Control SDK for .NET Control to generate, create, read, scan barcode image in .NET applications.
www.OnBarcode.com
Reading UPC Code In Java
Using Barcode reader for Java Control to read, scan read, scan image in Java applications.
www.OnBarcode.com
Copyright © OnBarcode.com . All rights reserved.