This page describes an older version of the product. The latest stable version is 14.0.

Space Index


Index Types

The index type is determined by the SpaceIndexType enumeration. The index types are:

NONE - No indexing is used.

EQUAL - performs equality matching (equal to/not equal to).

ORDERED - performs ordered matching (bigger than/less than).

EQUAL_AND_ORDERED - performs both equality and ordered matching, and uses a larger memory footprint than the other indexing types.

Note

The BASIC and EXTENDED index types have been deprecated as of version 12.3.

Indexing at Design Time

Specifying which properties of a class are indexed is done using annotations or gs.xml.

@SpaceClass
public class Person
{
    private String lastName;
    private String firstName;
    private Integer age;

    ...
    @SpaceIndex(type=SpaceIndexType.EQUAL)
    public String getFirstName() {return firstName;}
    public void setFirstName(String firstName) {this.firstName = firstName;}

    @SpaceIndex(type=SpaceIndexType.EQUAL)
    public String getLastName() {return lastName;}
    public void setLastName(String name) {this.lastName = name;}

    @SpaceIndex(type=SpaceIndexType.ORDERED)
    public Integer getAge() {return age;}
    public void setAge(Integer age) {this.age = age;}
}
<gigaspaces-mapping>
    <class name="com.gigaspaces.examples.Person" persist="false" replicate="false" fifo="false" >
        <property name="lastName">
            <index type="EQUAL"/>
        </property>
        <property name="firstName">
            <index type="EQUAL"/>
        </property>
        <property name="age">
             <index type="ORDERED"/>
        </property>
    </class>
</gigaspaces-mapping>

Inheritance

By default, a property’s index is inherited in sub-classes (i.e. if a property is indexed in a superclass, it is also indexed in a sub-class). If you need to change the index type of a property in a sub-class, you can override the property and annotate it with @SpaceIndex using the requested index type (to disable indexing, use NONE).