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By Joe Fallon, Rockford Lhotka
Do you need to create .NET purposes that supply excessive functionality and scalability? do you need to hire item - orientated programming strategies in a disbursed setting? do you need to maximise the reuse and maintainability of your code? Then this publication is for you. In Rockford Lhotka's specialist VB 2008 enterprise items, you will find out how to use complicated .NET Framework services along object-oriented layout and programming to create scalable, maintainable object-oriented purposes. higher nonetheless, this publication comprises Component-based Scalable Logical structure (CSLA) .NET 3.6, a widely-used framework on that you may base your software improvement. through the use of the techniques and framework within the booklet, you could concentration extra in your enterprise matters, and no more on expertise.
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Business Logic Provides all business rules, validation, manipulation, processing, and security for the application. Data Access Acts as an intermediary between the business logic and data management. Also encapsulates and contains all knowledge of data access technologies (such as LINQ to SQL), databases, and data structures. Data Storage and Management Physically creates, retrieves, updates, and deletes data in a persistent data store. Everything I’ve talked about to this point is part of a logical architecture.
Typically, applications have numerous points of failure. info C HAPTE R 1 ■ DISTRIBUTED A RCHITEC TURE In order to achieve high levels of fault tolerance, you need to ensure that if any one of these fails, some system will instantly kick in and fill the void. If the data center power goes out, a generator will kick in. If a bulldozer cuts your network feed, you’ll need to have a second network feed coming in from the other side of the building, and so forth. Considering some of the larger and more well-known outages of major websites in the past couple of years, it’s worth noting that most of them occurred because of construction work cutting network or power feeds or because their ISP or external DNS provider went down or was attacked.
In an ideal world, all of the business logic would exist in the Business layer, but in reality, this is virtually impossible to achieve. In a web-based application, validation logic is often included in the Interface layer, so that the user gets a more interactive experience in the browser. Unfortunately, any validation that’s done in the web browser is unreliable, because it’s too easy for a malicious user to bypass that validation. Thus, any validation done in the browser must be rechecked in the Business layer as well.