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The application obtains ISession instances from an ISessionFactory. Compared to the ISession interface, this object is much less exciting. The ISessionFactory certainly isn t lightweight! It s intended to be shared among many application threads. There is typically a single instance of ISessionFactory for the whole application created during application initialization, for example. But if your application accesses multiple databases using NHibernate, you ll need a SessionFactory for each database. The SessionFactory caches generated SQL statements and other mapping metadata that NHibernate uses at runtime. It can also hold cached data that has been read in one unit of work and which may be reused in a future unit of work or session. This is possible if you configure class and collection mappings to use the second-level cache.
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The Configuration object is used to configure NHibernate. The application uses a Configuration instance to specify the location of mapping documents and to set NHibernate-specific properties before creating the ISessionFactory.
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Even though the Configuration interface plays a relatively small part in the total scope of an NHibernate application, it s the first object you ll meet when you begin using NHibernate. Section 2.2 covers the issue of configuring NHibernate in some detail.
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The ITransaction interface is shown in figure 2.1, next to the ISession interface. The ITransaction interface is an optional API. NHibernate applications may choose not to use this interface, instead managing transactions in their own infrastructure code. An NHibernate ITransaction abstracts application code from the underlying transaction implementation which might be an ADO.NET transaction or any kind of manual transaction allowing the application to control transaction boundaries via a consistent API. This helps to keep NHibernate applications portable between different kinds of execution environments and containers. We use the NHibernate ITransaction API throughout this book. Transactions and the ITransaction interface are explained in chapter 5.
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IQUERY AND ICRITERIA INTERFACES
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The IQuery interface gives you powerful ways to perform queries against the database while also controlling how the query is executed. It s the basic interface used for fetching data using NHibernate. Queries are written in HQL or in your database s native SQL dialect. An IQuery instance is lightweight and can t be used outside the ISession that created it. It s used to bind query parameters, limit the number of results returned by the query, and execute the query. The ICriteria interface is similar; it lets you create and execute object-oriented criteria queries. We describe the features of the IQuery interface in chapter 7, where you ll learn how to use it in your applications. Now that we ve introduced you to the main APIs needed to write real-world NHibernate applications, the next section introduces some more advanced features. After that, we dive into how NHibernate is configured and how you can set up logging to view what NHibernate is doing behind the scenes (a great way of seeing NHibernate in action, if you ll excuse the pun!).
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Callback interfaces 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. NHibernate 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 ILifecycle and IValidatable interfaces let a persistent object react to events relating to its own persistence lifecycle. The persistence lifecycle is encompassed by an object s CRUD operations (when it s created, retrieved, updated, or deleted).
The original 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. Because these interfaces are deprecated, we don t discuss them in this book.