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Our usage of the metamodel API so far has opened the doors to strong type checking but at the expense of readability and increased complexity. The metamodel APIs are not complex, but they are verbose. To simplify their usage, the JPA 2.0 specification also defines what it calls the canonical metamodel of a persistence unit. The canonical metamodel consists of dedicated classes, typically generated, one per persistent class, that contain static declarations of the metamodel objects associated with that persistent class. This allows you to access the same information exposed through the metamodel API, but in a form that applies directly to your persistent classes. Listing 9-7 shows an example of a canonical metamodel class. Listing 9-7. The Canonical Metamodel Class for Employee @StaticMetamodel(Employee.class) public class Employee_ { public static volatile SingularAttribute<Employee, Integer> id; public static volatile SingularAttribute<Employee, String> name; public static volatile SingularAttribute<Employee, String> salary; public static volatile SingularAttribute<Employee, Department> dept; public static volatile SingularAttribute<Employee, Address> address; public static volatile CollectionAttribute<Employee, Project> project; public static volatile MapAttribute<Employee, String, Phone> phones; }

The first property that I will focus on with the FSI is objectDefinitionSource. In Spring Security, secured resources are called object definitions. The name is generic because Spring Security can be applied to method invocation and object creation in addition to web applications. The objectDefinitionSource is composed of directives and URL pattern to role mapping. The directives are same as the ones used for the filter chain proxy in Listing 6-3. A user with ROLE_ADMIN has access to all URLs starting with /secure/admin. Only authenticated users are allowed entry into all URLs starting with /secure. All other URLs can be accessed anonymously or if the user is already authenticated. Note that the URL mappings will be processed in the same order as they are defined. Also, you are free to define any role that you want for your application. The property authenticationManager uses the same Spring bean that I used with the APF. It can be used to reauthenticate a request. This can hurt application performance, so you need to set it carefully, and you can control this by setting the alwaysReauthenticate property of the FSI to false. The property accessDecisionManager works like authentication managers and is responsible for making the actual authorization decision. The access decision manager is wired up as shown in Listing 6-16.

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Each canonical metamodel class contains a series of static fields, one for each attribute in the persistent class. Each field in the canonical metamodel class is of the metamodel type that corresponds to the type of the like-named field or property in the persistent class. If a persistent field or property in an entity is of a primitive type or a single-valued relationship, then the like-named field in the canonical metamodel class will be of type SingularAttribute. Similarly, if a persistent field or property is collection-valued, then the field in the canonical metamodel class will be of type ListAttribute, SetAttribute, MapAttribute, or CollectionAttribute, depending upon the type of collection. Additionally, each canonical metamodel class is annotated with @StaticMetamodel, which identifies the persistent class it is modeling. A canonical metamodel class is generated in the same package as its associated persistent class and has the same name, but with an additional underscore suffix. Non-canonical metamodel classes may be generated in other packages and with different names if there is a need to do so. Some generation tools may provide these kinds of options. The @StaticMetamodel annotation provides the binding between the metamodel class and the entity, not the name or package, so there is no standard way of reading in such metamodels. If a provider tool can generate the concrete metamodel classes in some non-canonical form, then that runtime might be needed to recognize or detect them as well.

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