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:

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

Fields

Modifier and Type	Field and Description
protected String	defaultConnectionPool The default connection pool is used for any unmapped values.
protected List<String>	orderedPartitions Use to track order for compute UCP index.
protected Map<String,String>	partitionNames Store the value partitions by name.
protected Map<Object,String>	partitions Store the value partitions.
protected Class	partitionValueType The type of the partition values.
protected String	partitionValueTypeName The type name of the partition value names.

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

Constructors

Constructor and Description
ValuePartitioningPolicy()
ValuePartitioningPolicy(String partitionField)
ValuePartitioningPolicy(String partitionField, boolean unionUnpartitionableQueries)

Method Summary

Modifier and Type	Method and Description
void	addPartition(Object value, String connectionPool) PUBLIC: Add the value partition.
void	addPartitionName(String valueName, String connectionPool) INTERNAL: Add partition values by name (will be initialized at runtime with the real class loader).
void	convertClassNamesToClasses(ClassLoader classLoader) INTERNAL: Convert all the class-name-based settings to actual class-based settings.
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.
String	getDefaultConnectionPool() PUBLIC: Return the default connection pool used for any unmapped values.
List<String>	getOrderedPartitions()
Map<Object,String>	getPartitions() PUBLIC: Return the value partitions.
void	partitionPersist(org.eclipse.persistence.internal.sessions.AbstractSession session, Object object, ClassDescriptor descriptor) INTERNAL: Allow for the persist call to assign the partition.
void	setDefaultConnectionPool(String defaultConnectionPool) PUBLIC: Set the default connection pool used for any unmapped values.
void	setOrderedPartitions(List<String> orderedPartitions)
void	setPartitions(Map<Object,String> partitions) PUBLIC: Set the value partitions.
void	setPartitionValueTypeName(String partitionValueTypeName) INTERNAL:

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

extractPartitionValueForPersist, getPartitionField, getPartitionFieldName, getUnionUnpartitionableQueries, setPartitionField, setPartitionField, setUnionUnpartitionableQueries

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

acquireAccessor, 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 Map<Object,String> partitions

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

partitionNames

protected Map<String,String> partitionNames

Store the value partitions by name. Initialized at runtime.

partitionValueTypeName

protected String partitionValueTypeName

The type name of the partition value names. Initialized at runtime

partitionValueType

protected Class partitionValueType

The type of the partition values. Initialized from the type name at runtime.

orderedPartitions

protected List<String> orderedPartitions

Use to track order for compute UCP index.

defaultConnectionPool

protected String defaultConnectionPool

The default connection pool is used for any unmapped values.

Constructor Detail

ValuePartitioningPolicy

public ValuePartitioningPolicy()

ValuePartitioningPolicy

public ValuePartitioningPolicy(String partitionField)

ValuePartitioningPolicy

public ValuePartitioningPolicy(String partitionField,
                               boolean unionUnpartitionableQueries)

Method Detail

convertClassNamesToClasses

public void convertClassNamesToClasses(ClassLoader classLoader)

INTERNAL: Convert all the class-name-based settings to actual class-based settings. This method is used when converting a project that has been built with class names to a project with classes.

Overrides:

convertClassNamesToClasses in class PartitioningPolicy

setPartitionValueTypeName

public void setPartitionValueTypeName(String partitionValueTypeName)

INTERNAL:

getOrderedPartitions

public List<String> getOrderedPartitions()

setOrderedPartitions

public void setOrderedPartitions(List<String> orderedPartitions)

getDefaultConnectionPool

public String getDefaultConnectionPool()

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

setDefaultConnectionPool

public void setDefaultConnectionPool(String defaultConnectionPool)

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

getPartitions

public Map<Object,String> getPartitions()

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

setPartitions

public void setPartitions(Map<Object,String> partitions)

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

addPartition

public void addPartition(Object value,
                         String connectionPool)

PUBLIC: Add the value partition.

addPartitionName

public void addPartitionName(String valueName,
                             String connectionPool)

INTERNAL: Add partition values by name (will be initialized at runtime with the real class loader).

getConnectionsForQuery

public 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

partitionPersist

public void partitionPersist(org.eclipse.persistence.internal.sessions.AbstractSession session,
                             Object object,
                             ClassDescriptor descriptor)

INTERNAL: Allow for the persist call to assign the partition.

Overrides:

partitionPersist in class PartitioningPolicy