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Introducing and integrating Hibernate
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2.2.2 Callback interfaces
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Callback interfaces allow the application to receive a notification when something interesting happens to an object for example, when an object is loaded, saved, or deleted. Hibernate applications don t need to implement these callbacks, but they re useful for implementing certain kinds of generic functionality, such as creating audit records. The Lifecycle and Validatable interfaces allow a persistent object to react to events relating to its own persistence lifecycle. The persistence lifecycle is encompassed by an object s CRUD operations. The Hibernate team was heavily influenced by other ORM solutions that have similar callback interfaces. Later, they realized that having the persistent classes implement Hibernate-specific interfaces probably isn t a good idea, because doing so pollutes our persistent classes with nonportable code. Since these approaches are no longer favored, we don t discuss them in this book. The Interceptor interface was introduced to allow the application to process callbacks without forcing the persistent classes to implement Hibernate-specific APIs. Implementations of the Interceptor interface are passed to the persistent instances as parameters. We ll discuss an example in chapter 8.
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2.2.3 Types
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A fundamental and very powerful element of the architecture is Hibernate s notion of a Type. A Hibernate Type object maps a Java type to a database column type (actually, the type may span multiple columns). All persistent properties of persistent classes, including associations, have a corresponding Hibernate type. This design makes Hibernate extremely flexible and extensible. There is a rich range of built-in types, covering all Java primitives and many JDK classes, including types for java.util.Currency, java.util.Calendar, byte[], and java.io.Serializable. Even better, Hibernate supports user-defined custom types. The interfaces UserType and CompositeUserType are provided to allow you to add your own types. You can use this feature to allow commonly used application classes such as Address, Name, or MonetaryAmount to be handled conveniently and elegantly. Custom types are considered a central feature of Hibernate, and you re encouraged to put them to new and creative uses! We explain Hibernate types and user-defined types in chapter 6, section 6.1, Understanding the Hibernate type system.
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Basic configuration
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2.2.4 Extension interfaces
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Much of the functionality that Hibernate provides is configurable, allowing you to choose between certain built-in strategies. When the built-in strategies are insufficient, Hibernate will usually let you plug in your own custom implementation by implementing an interface. Extension points include:
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Primary key generation (IdentifierGenerator interface)
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SQL dialect support (Dialect abstract class)
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Caching strategies (Cache and CacheProvider interfaces)
JDBC connection management (ConnectionProvider interface)
Transaction management (TransactionFactory, Transaction, and TransactionManagerLookup interfaces)
ORM strategies (ClassPersister interface hierarchy)
Property access strategies (PropertyAccessor interface)
Proxy creation (ProxyFactory interface)
Hibernate ships with at least one implementation of each of the listed interfaces, so you don t usually need to start from scratch if you wish to extend the built-in functionality. The source code is available for you to use as an example for your own implementation. By now you can see that before we can start writing any code that uses Hibernate, we must answer this question: How do we get a Session to work with
2.3 Basic configuration
We ve looked at an example application and examined Hibernate s core interfaces. To use Hibernate in an application, you need to know how to configure it. Hibernate can be configured to run in almost any Java application and development environment. Generally, Hibernate is used in two- and three-tiered client/ server applications, with Hibernate deployed only on the server. The client application is usually a web browser, but Swing and SWT client applications aren t uncommon. Although we concentrate on multitiered web applications in this book, our explanations apply equally to other architectures, such as commandline applications. It s important to understand the difference in configuring Hibernate for managed and non-managed environments:
Managed environment Pools resources such as database connections and allows transaction boundaries and security to be specified declaratively (that
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