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The .NET framework has a powerful security policy. It allows, for example, web administrators to limit the permissions given to assemblies based on their provenance. This is required because web applications are generally accessible by a lot of uncontrollable persons; hence they must be carefully configured to avoid security issues. Web servers are often configured for medium trust. For this reason, if you intend to deploy your application in a public hosting service, you may have some issues getting it to work. The medium-trust policy enforces some restrictions that affect NHibernate applications: you can t use reflection to access private members of a class, and you can t use proxies because they can t be generated due to tightened security. You must map your database to public fields/properties, you must turn off lazy loading by setting Lazy=false in the mapping of each class, and you must turn off the reflection optimizer. Read sections 3.4.3 and 3.4.4 for more details. If your NHibernate configuration properties are in Web.config, you must add an extra attribute to the section declaration:
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<section name="nhibernate" type="..." requirePermission="false" />
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Setting the requirePermission attribute to false lets NHibernate read this section when loading the configuration.
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Many NHibernate applications use .NET remoting to make the business (or persistence) layer accessible across a network. This is mainly the case for Windows applications. In this scenario, most layers can be executed on the client s computer except
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the persistence layer, which is executed on the server. That way, database access can be restricted so that only the server knows how to access the database; the client communicates with the server using, for example, a layer of marshal-by-reference objects. The domain model must be serializable. Because NHibernate proxies aren t serializable, you must also return entities with fully initialized associations. In some edge cases, you may consider using Data Transfer Objects (DTOs). For more details, see section 10.3.1. Once the application is finished, you may ask yourself whether you achieved your initial goals. And now, the maintenance starts (fixing bugs, improving performance, and so on). Let s see how we can help you with these boring and stressful tasks.
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Now that we ve looked at the development process of an NHibernate application, let s take a step back and think again about the design of this application. Even with a good implementation and set of tests, a poorly designed application would be useless. This is why you should have some design goals and ways to measure how much they re achieved. A good understanding of the development process is required to fully take advantage of this section. But don t make the mistake of delaying this task when developing an application. You should realize that the costs to change the design of an application increase rapidly as the application is implemented. And in the middle of development, don t hesitate to take a break and look back at your initial goals and how far you are from them. Assessing an application s status isn t always easy. Developers can also have a hard time understanding what is wrong with their application. Having some problemsolving skills is definitively a plus when you re dealing with complex frameworks like NHibernate. Finally, remember that a single tool can t do every job. NHibernate is a good framework to solve the ORM mismatch; but it s also complex. We advise you to carefully test NHibernate and your competence before you begin to use it in a mission-critical environment. And learn to choose wisely: use NHibernate when it s the best option, and fall back to other alternatives for other situations. By the end of this section, you ll have a better understanding of how to deal with these tasks. Let s start with the first one in the development process: achieving your design goals.
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