Package org.eclipse.persistence.descriptors.partitioning

Class FieldPartitioningPolicy

java.lang.Object

org.eclipse.persistence.descriptors.partitioning.PartitioningPolicy

org.eclipse.persistence.descriptors.partitioning.FieldPartitioningPolicy

All Implemented Interfaces:

java.io.Serializable

Direct Known Subclasses:

HashPartitioningPolicy, RangePartitioningPolicy, ValuePartitioningPolicy

public abstract class FieldPartitioningPolicy
extends PartitioningPolicy

PUBLIC: FieldPartitioningPolicy partitions access to a database cluster by a field value from the object, such as the object's id, location, or tenant. 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	Description
protected org.eclipse.persistence.internal.helper.DatabaseField	partitionField	The column to partition by.
protected boolean	unionUnpartitionableQueries	If query does not have the partition field in it, should the query be sent to all databases.

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

name

Constructor Summary

Constructors

Constructor	Description
FieldPartitioningPolicy()
FieldPartitioningPolicy(java.lang.String partitionField)
FieldPartitioningPolicy(java.lang.String partitionField, boolean unionUnpartitionableQueries)

Method Summary

Modifier and Type	Method	Description
protected java.lang.Object	extractPartitionValueForPersist(org.eclipse.persistence.internal.sessions.AbstractSession session, java.lang.Object object, ClassDescriptor descriptor)	INTERNAL: If persist should be partitioned, extra value from object.
org.eclipse.persistence.internal.helper.DatabaseField	getPartitionField()	PUBLIC: Return the database column or query parameter to partition queries by.
java.lang.String	getPartitionFieldName()	PUBLIC: Return the database column or query parameter to partition queries by.
boolean	getUnionUnpartitionableQueries()	PUBLIC: Return if queries that do not contain the partition field should be sent to every database and have the result unioned.
void	setPartitionField(java.lang.String partitionField)	PUBLIC: Set the database column or query parameter to partition queries by.
void	setPartitionField(org.eclipse.persistence.internal.helper.DatabaseField partitionField)	PUBLIC: Set the database column or query parameter to partition queries by.
void	setUnionUnpartitionableQueries(boolean unionUnpartitionableQueries)	PUBLIC: Set if queries that do not contain the partition field should be sent to every database and have the result unioned.

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

acquireAccessor, convertClassNamesToClasses, getAccessor, getConnectionsForQuery, getName, initialize, partitionPersist, setName

Methods inherited from class java.lang.Object

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

Field Detail

partitionField

protected org.eclipse.persistence.internal.helper.DatabaseField partitionField

The column to partition by.

unionUnpartitionableQueries

protected boolean unionUnpartitionableQueries

If query does not have the partition field in it, should the query be sent to all databases.

Constructor Detail

FieldPartitioningPolicy

public FieldPartitioningPolicy()

FieldPartitioningPolicy

public FieldPartitioningPolicy(java.lang.String partitionField)

FieldPartitioningPolicy

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

Method Detail

getPartitionField

public org.eclipse.persistence.internal.helper.DatabaseField getPartitionField()

PUBLIC: Return the database column or query parameter to partition queries by. This is the table column name, not the class attribute name. The column value must be included in the query and should normally be part of the object's Id. This can also be the name of a query parameter. If a query does not contain the field the query will not be partitioned.

setPartitionField

public void setPartitionField(org.eclipse.persistence.internal.helper.DatabaseField partitionField)

PUBLIC: Set the database column or query parameter to partition queries by. This is the table column name, not the class attribute name. The column value must be included in the query and should normally be part of the object's Id. This can also be the name of a query parameter. If a query does not contain the field the query will not be partitioned.

getPartitionFieldName

public java.lang.String getPartitionFieldName()

PUBLIC: Return the database column or query parameter to partition queries by. This is the table column name, not the class attribute name. The column value must be included in the query and should normally be part of the object's Id. This can also be the name of a query parameter. If a query does not contain the field the query will not be partitioned.

setPartitionField

public void setPartitionField(java.lang.String partitionField)

PUBLIC: Set the database column or query parameter to partition queries by. This is the table column name, not the class attribute name. The column value must be included in the query and should normally be part of the object's Id. This can also be the name of a query parameter. If a query does not contain the field the query will not be partitioned.

getUnionUnpartitionableQueries

public boolean getUnionUnpartitionableQueries()

PUBLIC: Return if queries that do not contain the partition field should be sent to every database and have the result unioned.

setUnionUnpartitionableQueries

public void setUnionUnpartitionableQueries(boolean unionUnpartitionableQueries)

PUBLIC: Set if queries that do not contain the partition field should be sent to every database and have the result unioned.

extractPartitionValueForPersist

protected java.lang.Object extractPartitionValueForPersist(org.eclipse.persistence.internal.sessions.AbstractSession session,
                                                           java.lang.Object object,
                                                           ClassDescriptor descriptor)

INTERNAL: If persist should be partitioned, extra value from object.