EclipseLink 2.2.0, build 'v20110202-r8913' API Reference

org.eclipse.persistence.annotations
Annotation Type RoundRobinPartitioning


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

RoundRobinPartitioning sends requests in a round robin fashion to the set of connection pools. It is for load-balancing read queries across a cluster of database machines. It requires that the full database be replicated on each machine, so does not support partitioning. The data should either be read-only, or writes should be replicated on the database.

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, RoundRobinPartitioningPolicy
Author:
James Sutherland
Since:
EclipseLink 2.2

Required Element Summary
 java.lang.String name
          The name of the partition policy, names must be unique for the persistence unit.
 
Optional Element Summary
 java.lang.String[] connectionPools
          List of connection pool names to load balance across.
 boolean replicateWrites
          This allows for a set of database to be written to and kept in synch, and have reads load-balanced across the databases.
 

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
This allows for a set of database to be written to and kept in synch, and have reads load-balanced across the databases.

Default:
false

EclipseLink 2.2.0, build 'v20110202-r8913' API Reference