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

Create PDF 417 in C#.NET DIS TRIBUTED ARC HITE CTURE

CHAPTER 1 DIS TRIBUTED ARC HITE CTURE
Draw PDF-417 2d Barcode In C#
Using Barcode generator for Visual Studio .NET Control to generate, create PDF-417 2d barcode image in VS .NET applications.
www.OnBarcode.com
PDF-417 2d Barcode Reader In Visual C#
Using Barcode decoder for Visual Studio .NET Control to read, scan read, scan image in Visual Studio .NET applications.
www.OnBarcode.com
Another reason for moving the Data Access layer to an application server is security. Since the Data Access layer contains the code that interacts directly with the database, the machine on which it runs must have credentials to access the database server. Rather than having those credentials on the client workstation, they can be moved to an application server. This way, the user s computer won t have the credentials to interact directly with the database server, thus increasing security. It is also possible to put the Business layer on the application server. This is useful for noninteractive processes such as batch updates or data-intensive business algorithms. Yet, at the same time, most applications allow for user interaction, so there is a definite need to have the Business layer running on the client workstation to provide high levels of interactivity for the user. As discussed earlier in the chapter, it is possible to deploy the same logical layer onto multiple physical tiers. Using this idea, you can put the Data Access layer on an application server, and the Business layer on both the client workstation and the application server, as shown in Figure 1-4.
Making ANSI/AIM Code 39 In Visual C#.NET
Using Barcode maker for .NET Control to generate, create ANSI/AIM Code 39 image in Visual Studio .NET applications.
www.OnBarcode.com
Matrix Generator In C#.NET
Using Barcode generator for .NET framework Control to generate, create 2D Barcode image in VS .NET applications.
www.OnBarcode.com
Figure 1-4. The five logical layers with separate application and database servers Putting the Data Access layer on the application server centralizes all access to the database on a single machine. In .NET, if the connections to the database for all users are made using the same user ID and password, you ll get the benefits of connection pooling for all your users. What this means immediately is that there will be far fewer connections to the database than there would have been if each client machine had connected directly. The actual reduction depends on the specific application, but often it means supporting 150 to 200 concurrent users with just two or three database connections. Of course, all user requests now go across an extra network hop, thereby causing increased latency (and therefore decreased performance). This performance cost translates into a huge scalability gain, however, because this architecture can handle many more concurrent users than a 2-tier physical configuration. With the Business layer deployed on both the client and server, the application is able to fully exploit the strengths of both machines. Validation and a lot of other business processing can run on the client workstation to provide a rich and highly interactive experience for the user, while noninteractive processes can efficiently run on the application server. If well designed, such an architecture can support thousands of concurrent users with adequate performance.
1D Creator In C#.NET
Using Barcode encoder for .NET Control to generate, create Linear Barcode image in .NET applications.
www.OnBarcode.com
Print Barcode In C#.NET
Using Barcode encoder for Visual Studio .NET Control to generate, create Barcode image in .NET applications.
www.OnBarcode.com
C HAPTE R 1 DISTRIBUTED A RCHITEC TURE
EAN / UCC - 13 Creator In Visual C#.NET
Using Barcode drawer for Visual Studio .NET Control to generate, create GTIN - 128 image in Visual Studio .NET applications.
www.OnBarcode.com
Identcode Printer In Visual C#.NET
Using Barcode drawer for .NET framework Control to generate, create Identcode image in Visual Studio .NET applications.
www.OnBarcode.com
Optimal Performance Web Client
Encoding PDF 417 In None
Using Barcode encoder for Excel Control to generate, create PDF417 image in Excel applications.
www.OnBarcode.com
PDF417 Scanner In VB.NET
Using Barcode recognizer for .NET framework Control to read, scan read, scan image in .NET framework applications.
www.OnBarcode.com
As with WPF or Windows Forms applications, the best performance is received in web-based applications by minimizing the number of physical tiers. However, the trade-off in a web scenario is different: in this case, it is possible to improve performance and scalability at the same time, but at the cost of security, as I will demonstrate. To get optimal performance in a web application, it is desirable to run most of the code in a single process on a single machine, as shown in Figure 1-5.
Encoding Code-128 In None
Using Barcode drawer for Software Control to generate, create ANSI/AIM Code 128 image in Software applications.
www.OnBarcode.com
Scanning PDF-417 2d Barcode In Visual Basic .NET
Using Barcode recognizer for .NET Control to read, scan read, scan image in .NET applications.
www.OnBarcode.com
Figure 1-5. The five logical layers as used for web applications The Interface layer must be physically separate because it s running in a browser, but the Interface Control, Business, and Data Access layers can all run on the same machine, in the same process. In some cases, you might even put the Data Storage and Management layer on the same physical machine, though this is only suitable for smaller applications. This minimizes network and communication overhead and optimizes performance. Figure 1-6 shows how it is possible to get good scalability, because the web server can be part of a web farm in which all the web servers are running the same code.
Reading Code 39 Full ASCII In .NET
Using Barcode reader for Visual Studio .NET Control to read, scan read, scan image in .NET framework applications.
www.OnBarcode.com
ECC200 Generator In Java
Using Barcode creation for Java Control to generate, create DataMatrix image in Java applications.
www.OnBarcode.com
Code 128 Code Set B Generator In Java
Using Barcode maker for Java Control to generate, create Code 128 image in Java applications.
www.OnBarcode.com
UPC-A Scanner In C#
Using Barcode scanner for Visual Studio .NET Control to read, scan read, scan image in .NET framework applications.
www.OnBarcode.com
DataMatrix Printer In Java
Using Barcode generator for Android Control to generate, create Data Matrix image in Android applications.
www.OnBarcode.com
Encoding Barcode In None
Using Barcode creation for Word Control to generate, create Barcode image in Word applications.
www.OnBarcode.com
PDF-417 2d Barcode Maker In Java
Using Barcode creation for Eclipse BIRT Control to generate, create PDF417 image in BIRT reports applications.
www.OnBarcode.com
Barcode Recognizer In Visual Basic .NET
Using Barcode recognizer for .NET framework Control to read, scan read, scan image in Visual Studio .NET applications.
www.OnBarcode.com
Copyright © OnBarcode.com . All rights reserved.