org.eclipse.persistence.annotations

Annotation Type UnionPartitioning

@Target(value={TYPE,METHOD,FIELD})
 @Retention(value=RUNTIME)
public @interface UnionPartitioning

UnionPartitioning sends queries to all connection pools and unions the results. This is for queries or relationships that span partitions when partitioning is used, such as on a ManyToMany cross partition relationship.

Partitioning can be enabled on an Entity, relationship, query, or session/persistence unit. Partition policies are globally named to allow reuse, the partitioning policy must also be set using the @Partitioned annotation to be used.

See Also:

Partitioned, UnionPartitioningPolicy

Author:

James Sutherland

Since:

EclipseLink 2.2

Required Element Summary

Required Elements

Modifier and Type	Required Element and Description
java.lang.String	name The name of the partition policy, names must be unique for the persistence unit.

Optional Element Summary

Optional Elements

Modifier and Type	Optional Element and Description
java.lang.String[]	connectionPools List of connection pool names to load balance across.
boolean	replicateWrites Defines if write queries should be replicated.

Element Detail

name

public abstract java.lang.String name

The name of the partition policy, names must be unique for the persistence unit.

connectionPools

public abstract java.lang.String[] connectionPools

List of connection pool names to load balance across. Defaults to all defined pools in the ServerSession.

Default:

{}

replicateWrites

public abstract boolean replicateWrites

Defines if write queries should be replicated. Writes are normally not replicated when unioning, but can be for ManyToMany relationships, when the join table needs to be replicated.

Default:

false