UnionPartitioningPolicy (EclipseLink Core 3.0.4-RC1 API)

java.lang.Object
- org.eclipse.persistence.descriptors.partitioning.PartitioningPolicy
- - org.eclipse.persistence.descriptors.partitioning.ReplicationPartitioningPolicy
  - - org.eclipse.persistence.descriptors.partitioning.UnionPartitioningPolicy

All Implemented Interfaces:

Serializable
```
public class UnionPartitioningPolicy
extends ReplicationPartitioningPolicy
```
PUBLIC: UnionPartitionPolicy 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.

Since:

EclipseLink 2.2

Author:

James Sutherland

See Also:

Serialized Form

Field Summary

Fields
Modifier and Type Field Description

protected boolean replicateWrites
- Fields inherited from class org.eclipse.persistence.descriptors.partitioning.ReplicationPartitioningPolicy
  connectionPools
- Fields inherited from class org.eclipse.persistence.descriptors.partitioning.PartitioningPolicy
  name

Constructor Summary

Constructors
Constructor	Description
`UnionPartitioningPolicy()`
`UnionPartitioningPolicy(boolean replicateWrites)`
`UnionPartitioningPolicy(String... pools)`
`UnionPartitioningPolicy(List<String> pools)`

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`List<Accessor>`	`getConnectionsForQuery(AbstractSession session, DatabaseQuery query, AbstractRecord arguments)`	INTERNAL: Get a connection from one of the pools in a round robin rotation fashion.
`boolean`	`getReplicateWrites()`	PUBLIC: Return if write queries should be replicated.
`void`	`setReplicateWrites(boolean replicateWrites)`	PUBLIC: Set if write queries should be replicated.

Methods inherited from class org.eclipse.persistence.descriptors.partitioning.ReplicationPartitioningPolicy
addConnectionPool, getConnectionPools, initialize, setConnectionPools

Methods inherited from class org.eclipse.persistence.descriptors.partitioning.PartitioningPolicy
acquireAccessor, convertClassNamesToClasses, getAccessor, getName, partitionPersist, setName

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - replicateWrites
```
protected boolean replicateWrites
```
- Constructor Detail
  - UnionPartitioningPolicy
```
public UnionPartitioningPolicy()
```
  - UnionPartitioningPolicy
```
public UnionPartitioningPolicy(boolean replicateWrites)
```
  - UnionPartitioningPolicy
```
public UnionPartitioningPolicy(String... pools)
```
  - UnionPartitioningPolicy
```
public UnionPartitioningPolicy(List<String> pools)
```
- Method Detail
  - getReplicateWrites
```
public boolean getReplicateWrites()
```
    PUBLIC: Return 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.
  - setReplicateWrites
```
public void setReplicateWrites(boolean replicateWrites)
```
    PUBLIC: Set 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.
  - getConnectionsForQuery
```
public List<Accessor> getConnectionsForQuery(AbstractSession session,
                                             DatabaseQuery query,
                                             AbstractRecord arguments)
```
    INTERNAL: Get a connection from one of the pools in a round robin rotation fashion.
    
    Overrides:
    
    getConnectionsForQuery in class ReplicationPartitioningPolicy