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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.

Since:

EclipseLink 2.2

Author:

James Sutherland

See Also:

Partitioned, RoundRobinPartitioningPolicy

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

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