pdf417 barcode generator c# DIS TRIBUTED ARC HITE CTURE in C#

Paint PDF 417 in C# DIS TRIBUTED ARC HITE CTURE

CHAPTER 1 DIS TRIBUTED ARC HITE CTURE
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possible response time for a given user the ideal solution is to put the client, the logic, and the data on the user s machine. This means no network hops, no network latency, and no contention with other users. If you decide that you need to support multiple users, you might consider putting application data on a central file server. (This is typical with Access and dBASE systems, for example.) However, this immediately affects performance because of contention on the data file. Furthermore, data access now takes place across the network, which means you ve introduced network latency and network contention, too. To overcome this problem, you could put the data into a managed environment such as SQL Server or Oracle. This will help to reduce data contention, but you re still stuck with the network latency and contention problems. Although improved, performance for a given user is still nowhere near what it was when everything ran directly on that user s computer. Even with a central database server, scalability is limited. Clients are still in contention for the resources of the server, with each client opening and closing connections, doing queries and updates, and constantly demanding the CPU, memory, and disk resources that other clients are using. You can reduce this load by shifting some of the work to another server. An application server, possibly running Enterprise Services or Internet Information Services (IIS), can provide database connection pooling to minimize the number of database connections that are opened and closed. It can also perform some data processing, filtering, and even caching to offload some work from the database server.
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Note
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It is important to realize that modern database servers can often easily handle hundreds of concurrent users in a 2-tier architecture. For most applications, scalability is not a good reason to move from a 2- to 3-tier model.
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These additional steps provide a dramatic boost to scalability, but again at the cost of performance. The user s request now has two network hops, potentially resulting in double the network latency and contention. For a single user, the system gets slower; however, it is able to handle many times more users with acceptable performance levels. In the end, the application is constrained by the most limiting resource. This is typically the speed of transferring data across the network but if the database or application server is underpowered, it can become so slow that data transfer across the network won t be an issue. Likewise, if the application does extremely intense calculations and the client machines are slow, then the cost of transferring the data across the network to a relatively idle high-speed server can make sense.
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Security is a broad and complex topic, but by narrowing the discussion solely to consider how it s affected by physical n-tier decisions, it becomes more approachable. The discussion is no longer about authentication or authorization as much as it is about controlling physical access to the machines on which portions of the application will run. The number of physical tiers in an application has no impact on whether users can be authenticated or authorized, but physical tiers can be used to increase or decrease physical access to the machines on which the application executes. For instance, in a 2-tier Windows Forms or ASP.NET application, the machine running the interface code must have credentials to access the database server. Switching to a 3-tier model in which the data access code runs on an application server means that the machine running the interface code no longer needs those credentials, potentially making the system more secure. Security requirements vary radically based on the environment and the requirements of your application. A Windows Forms application deployed only to internal users may need relatively little security, but an ASP.NET application exposed to anyone on the Internet may need extensive security. To a large degree, security is all about surface area: how many points of attack are exposed from the application The surface area can be defined in terms of domains of trust.
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