org.eclipse.persistence.descriptors.partitioning
Class ValuePartitioningPolicy

java.lang.Object
  org.eclipse.persistence.descriptors.partitioning.PartitioningPolicy
      org.eclipse.persistence.descriptors.partitioning.FieldPartitioningPolicy
          org.eclipse.persistence.descriptors.partitioning.ValuePartitioningPolicy

All Implemented Interfaces:

java.io.Serializable

public class ValuePartitioningPolicy
extends FieldPartitioningPolicy

PUBLIC: ValuePartitioningPolicy partitions access to a database cluster by a field value from the object, such as the object's location, or tenant. Each value is assigned a specific server. All write or read request for object's with that value are sent to the server. If a query does not include the field as a parameter, then it can either be sent to all server's and unioned, or left to the sesion's default behavior.

See Also:

Serialized Form

Author:

James Sutherland

Since:

EclipseLink 2.2

Field Summary

protected java.lang.String	defaultConnectionPool The default connection pool is used for any unmapped values.
protected java.util.Map<java.lang.Object,java.lang.String>	partitions Store the value partitions.

Fields inherited from class org.eclipse.persistence.descriptors.partitioning.FieldPartitioningPolicy

partitionField, unionUnpartitionableQueries

Fields inherited from class org.eclipse.persistence.descriptors.partitioning.PartitioningPolicy

name

Constructor Summary

ValuePartitioningPolicy()

ValuePartitioningPolicy(java.lang.String partitionField)

ValuePartitioningPolicy(java.lang.String partitionField, boolean unionUnpartitionableQueries)

Method Summary

void	addPartition(java.lang.Object value, java.lang.String connectionPool) PUBLIC: Add the value partition.
java.util.List<org.eclipse.persistence.internal.databaseaccess.Accessor>	getConnectionsForQuery(org.eclipse.persistence.internal.sessions.AbstractSession session, DatabaseQuery query, org.eclipse.persistence.internal.sessions.AbstractRecord arguments) INTERNAL: Get a connection from one of the pools in a round robin rotation fashion.
java.lang.String	getDefaultConnectionPool() PUBLIC: Return the default connection pool used for any unmapped values.
java.util.Map<java.lang.Object,java.lang.String>	getPartitions() PUBLIC: Return the value partitions.
void	setDefaultConnectionPool(java.lang.String defaultConnectionPool) PUBLIC: Set the default connection pool used for any unmapped values.
void	setPartitions(java.util.Map<java.lang.Object,java.lang.String> partitions) PUBLIC: Set the value partitions.

Methods inherited from class org.eclipse.persistence.descriptors.partitioning.FieldPartitioningPolicy

getPartitionField, getPartitionFieldName, getUnionUnpartitionableQueries, setPartitionField, setPartitionField, setUnionUnpartitionableQueries

Methods inherited from class org.eclipse.persistence.descriptors.partitioning.PartitioningPolicy

acquireAccessor, convertClassNamesToClasses, getAccessor, getName, initialize, setName

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

partitions

protected java.util.Map<java.lang.Object,java.lang.String> partitions

Store the value partitions. Each partition maps a value to a connectionPool.

defaultConnectionPool

protected java.lang.String defaultConnectionPool

The default connection pool is used for any unmapped values.

Constructor Detail

ValuePartitioningPolicy

public ValuePartitioningPolicy()

ValuePartitioningPolicy

public ValuePartitioningPolicy(java.lang.String partitionField)

ValuePartitioningPolicy

public ValuePartitioningPolicy(java.lang.String partitionField,
                               boolean unionUnpartitionableQueries)

Method Detail

getDefaultConnectionPool

public java.lang.String getDefaultConnectionPool()

PUBLIC: Return the default connection pool used for any unmapped values.

setDefaultConnectionPool

public void setDefaultConnectionPool(java.lang.String defaultConnectionPool)

PUBLIC: Set the default connection pool used for any unmapped values.

getPartitions

public java.util.Map<java.lang.Object,java.lang.String> getPartitions()

PUBLIC: Return the value partitions. Each partition maps a value to a connectionPool.

setPartitions

public void setPartitions(java.util.Map<java.lang.Object,java.lang.String> partitions)

PUBLIC: Set the value partitions. Each partition maps a value to a connectionPool.

addPartition

public void addPartition(java.lang.Object value,
                         java.lang.String connectionPool)

PUBLIC: Add the value partition.

getConnectionsForQuery

public java.util.List<org.eclipse.persistence.internal.databaseaccess.Accessor> getConnectionsForQuery(org.eclipse.persistence.internal.sessions.AbstractSession session,
                                                                                                       DatabaseQuery query,
                                                                                                       org.eclipse.persistence.internal.sessions.AbstractRecord arguments)

INTERNAL: Get a connection from one of the pools in a round robin rotation fashion.

Specified by:

getConnectionsForQuery in class PartitioningPolicy