4.4.2. Dynamic Index Time Boosting

The @Boost annotation defines a static boost factor that is independent of the state of the indexed entity at runtime. However, in some cases the boost factor may depend on the actual state of the entity. In this case, use the @DynamicBoost annotation together with an accompanying custom BoostStrategy.

@Boost and @DynamicBoost annotations can both be used in relation to an entity, and all defined boost factors are cumulative. The @DynamicBoost can be placed at either class or field level.

In the following example, a dynamic boost is defined on class level specifying VIPBoostStrategy as implementation of the BoostStrategy interface used at indexing time. Depending on the annotation placement, either the whole entity is passed to the defineBoost method or only the annotated field/property value. The passed object must be cast to the correct type.

Example 4.8. Dynamic boost example

public enum PersonType {
    NORMAL,
    VIP
}

@Indexed
@DynamicBoost(impl = VIPBoostStrategy.class)
public class Person {
    private PersonType type;   
    
    // ....
}

public class VIPBoostStrategy implements BoostStrategy {
    public float defineBoost(Object value) {
        Person person = ( Person ) value;
        if ( person.getType().equals( PersonType.VIP ) ) {
            return 2.0f;
        }
        else {
            return 1.0f;
        }
    }
}

public enum PersonType {
    NORMAL,
    VIP
}

@Indexed
@DynamicBoost(impl = VIPBoostStrategy.class)
public class Person {
    private PersonType type;   
    
    // ....
}

public class VIPBoostStrategy implements BoostStrategy {
    public float defineBoost(Object value) {
        Person person = ( Person ) value;
        if ( person.getType().equals( PersonType.VIP ) ) {
            return 2.0f;
        }
        else {
            return 1.0f;
        }
    }
}

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In the provided example all indexed values of a VIP would be twice the importance of the values of a non-VIP.

Note

The specified BoostStrategy implementation must define a public no argument constructor.

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4.4.2. Dynamic Index Time Boosting

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