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.
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).