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Chapter 13. Annotating Objects and Querying

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Chapter 13. Annotating Objects and Querying

Once indexing has been enabled, custom objects being stored in Red Hat JBoss Data Grid need to be assigned appropriate annotations.

As a basic requirement, all objects required to be indexed must be annotated with

@Indexed

In addition, all fields within the object that will be searched need to be annotated with @Field.

Example 13.1. Annotating Objects with @Field

@Indexed
public class Person implements Serializable {
    @Field(store = Store.YES)
    private String name;
    @Field(store = Store.YES)
    private String description;
    @Field(store = Store.YES)
    private int age;
}

@Indexed
public class Person implements Serializable {
    @Field(store = Store.YES)
    private String name;
    @Field(store = Store.YES)
    private String description;
    @Field(store = Store.YES)
    private int age;
}

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For other annotations and options, see Chapter 14, Mapping Domain Objects to the Index Structure

Important

When using JBoss EAP modules with JBoss Data Grid with the domain model as a module, add the org.infinispan.query dependency with slot "jdg-7.0" into the module.xml file. The custom annotations are not picked by the queries without the org.infinispan.query dependency and results in an error.

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13.1. Registering a Transformer via Annotations
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The key for each value must also be indexed, and the key instance must then be transformed in a String.

Red Hat JBoss Data Grid includes some default transformation routines for encoding common primitives, however to use a custom key you must provide an implementation of org.infinispan.query.Transformer.

The following example shows how to annotate your key type using org.infinispan.query.Transformer:

Example 13.2. Annotating the Key Type

@Transformable(transformer = CustomTransformer.class)
public class CustomKey {

}
 
public class CustomTransformer implements Transformer {
    @Override
    public Object fromString(String s) {
        return new CustomKey(...);
    }
 
    @Override
    public String toString(Object customType) {
        CustomKey ck = (CustomKey) customType;
        return ck.toString();
    }
}

@Transformable(transformer = CustomTransformer.class)
public class CustomKey {

}
 
public class CustomTransformer implements Transformer {
    @Override
    public Object fromString(String s) {
        return new CustomKey(...);
    }
 
    @Override
    public String toString(Object customType) {
        CustomKey ck = (CustomKey) customType;
        return ck.toString();
    }
}

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The two methods must implement a biunique correspondence.

For example, for any object A the following must be true:

Example 13.3. Biunique Correspondence

A.equals(transformer.fromString(transformer.toString(A));

A.equals(transformer.fromString(transformer.toString(A));

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This assumes that the transformer is the appropriate Transformer implementation for objects of type A.

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Chapter 13. Annotating Objects and Querying

13.1. Registering a Transformer via Annotations
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13.1. Registering a Transformer via Annotations
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