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The persistence layer can provide a higher level of abstraction for dataaccess operations. Instead of basic CRUD and query operations, you can expose higher-level operations, such as a getMaximumBid() method. This abstraction is the primary reason why you want to create a persistence layer in larger applications: to support reuse of the same non-CRUD operations. The persistence layer can have a generic interface without exposing actual implementation details. In other words, you can hide the fact that you re using Hibernate (or Java Persistence) to implement the data-access operations from any client of the persistence layer. We consider persistence layer portability an unimportant concern, because full object/relational mapping solutions like Hibernate already provide database portability. It s highly unlikely that you ll rewrite your persistence layer with different software in the future and still not want to change any client code. Furthermore, consider Java Persistence as a standardized and fully portable API. The persistence layer can unify data-access operations. This concern is related to portability, but from a slightly different angle. Imagine that you have to deal with mixed data-access code, such as Hibernate and JDBC operations. By unifying the facade that clients see and use, you can hide this implementation detail from the client.

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6. In the right pane, double-click the policy you want to edit. Windows displays the dialog box for the policy, as shown in Figure 16-3.

Figure 16-3

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If you consider portability and unification to be side effects of creating a persistence layer, your primary motivation is achieving a higher level of abstraction and the improved maintainability and reuse of data-access code. These are good reasons, and we encourage you to create a persistence layer with a generic facade in all but the simplest applications. It s again important that you don t overengineer your system and that you first consider using Hibernate (or Java Persistence APIs) directly without any additional layering. Let s assume you want to create a persistence layer and design a facade that clients will call. There is more than one way to design a persistence layer facade some small applications may use a single PersistenceManager object; some may use some kind of command-oriented design, and others mix data-access operations into domain classes (active record) but we prefer the DAO pattern.

Settings you configure using the Local Security Policy tool occur immediately; you are not required to save the policy changes. Most of the settings that you make will take effect the next time a user logs on to the computer.

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Windows XP Professional provides a number of predefined security templates that you can use as a starting point when configuring Local Security Policy. Each template is a collection of settings designed for a particular environment. You can use these templates as they come or you can customize them to suit your needs. There are two advantages of using administrative templates. The first advantage is that you can rely on preconfigured settings instead of having to configure all the settings yourself. The second advantage is that after you have configured a security template to suit your needs, you can use that template to quickly apply settings to other computers, saving you from having to configure the Local Security Policy yourself on each computer. Predefined Security Templates By default, the predefined security templates are stored in the %systemroot%\Security\Templates folder. The predefined templates available include the following: Setup Security (Setup Security.inf) This template defines the default level of security applied to all new installations of Windows XP Professional on an NTFS File System partition. This template is also intended for resetting security levels back to their default in disaster recovery situations.

The DAO design pattern originated in Sun s Java Blueprints. It s even used in the infamous Java Petstore demo application. A DAO defines an interface to persistence operations (CRUD and finder methods) relating to a particular persistent entity; it advises you to group together code that relates to persistence of that entity. Using JDK 5.0 features such as generics and variable arguments, you can design a nice DAO persistence layer easily. The basic structure of the pattern we re proposing here is shown in figure 16.1.

16-7

Compatible (Compatws.inf) This template provides a higher level of security than Setup Security, but still ensures that standard applications will run successfully. By default, this template allows all users to run Windows-certified applications, but allows only power users to run noncertified applications. Secure (Securews.inf) This template adds an additional layer of security to the Compatible level and can restrict some applications from functioning properly. High Secure (Hisecws.inf) This template provides a maximum level of security for network traffic and communication protocols without regard for application compatibility. The High Secure templates impose greater restrictions on the levels of encryption and signing required for authentication. Root Directory Permissions (Rootsec.inf) This template specifies the default Windows XP Professional permissions for the root of the system partition. You can use this template to reset the file permissions for the system partition root in disaster recovery situations.

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