Package org.eclipse.persistence.sequencing

Class UUIDSequence

java.lang.Object

org.eclipse.persistence.sequencing.Sequence

org.eclipse.persistence.sequencing.UUIDSequence

All Implemented Interfaces:

Serializable, Cloneable

public class UUIDSequence
extends Sequence

See Also:

• Serialized Form

Field Summary

Fields inherited from class org.eclipse.persistence.sequencing.Sequence

depth, initialValue, isCustomQualifier, name, platform, qualifier, shouldAlwaysOverrideExistingValue, size

Constructor Summary

Constructors

Constructor	Description
UUIDSequence()
UUIDSequence(String name)

Method Summary

Modifier and Type	Method	Description
Object	getGeneratedValue(org.eclipse.persistence.internal.databaseaccess.Accessor accessor, org.eclipse.persistence.internal.sessions.AbstractSession writeSession, String seqName)	INTERNAL: Return the newly-generated sequencing value.
Vector	getGeneratedVector(org.eclipse.persistence.internal.databaseaccess.Accessor accessor, org.eclipse.persistence.internal.sessions.AbstractSession writeSession, String seqName, int size)	INTERNAL: Return a Vector of newly-generated sequencing values.
void	onConnect()	INTERNAL: This method is called when Sequencing object is created.
void	onDisconnect()	INTERNAL: This method is called when Sequencing object is destroyed.
boolean	shouldAcquireValueAfterInsert()	INTERNAL: Indicates whether sequencing value should be acquired after INSERT.
boolean	shouldUsePreallocation()	INTERNAL: Indicates whether several sequencing values should be acquired at a time and be kept by TopLink.
boolean	shouldUseTransaction()	INTERNAL: Indicates whether TopLink should internally call beginTransaction() before getGeneratedValue/Vector, and commitTransaction after.

Methods inherited from class org.eclipse.persistence.sequencing.Sequence

clone, equalNameAndSize, equals, getDatasourcePlatform, getGeneratedValue, getGeneratedVector, getInitialValue, getName, getPreallocationSize, getQualified, getQualifier, hashCode, isConnected, isCustomQualifier, isNative, isTable, isUnaryTable, onConnect, onDisconnect, setDatasourcePlatform, setInitialValue, setName, setPreallocationSize, setQualifier, setShouldAlwaysOverrideExistingValue, shouldAlwaysOverrideExistingValue, shouldAlwaysOverrideExistingValue, toString, verifyPlatform

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Details

UUIDSequence

public UUIDSequence()

UUIDSequence

public UUIDSequence(String name)

Method Details

getGeneratedValue

public Object getGeneratedValue(org.eclipse.persistence.internal.databaseaccess.Accessor accessor,
 org.eclipse.persistence.internal.sessions.AbstractSession writeSession,
 String seqName)

Description copied from class: Sequence

INTERNAL: Return the newly-generated sequencing value. Used only in case preallocation is not used (shouldUsePreallocation()==false). Accessor may be non-null only in case shouldUseSeparateConnection()==true. Even in this case accessor could be null - if SequencingControl().shouldUseSeparateConnection()==false; Therefore in case shouldUseSeparateConnection()==true, implementation should handle both cases: use a separate connection if provided (accessor != null), or get by without it (accessor == null).

Specified by:

getGeneratedValue in class Sequence

Parameters:

accessor - Accessor is a separate sequencing accessor (may be null);

writeSession - Session is a Session used for writing (either ClientSession or DatabaseSession);

seqName - String is sequencing number field name

getGeneratedVector

public Vector getGeneratedVector(org.eclipse.persistence.internal.databaseaccess.Accessor accessor,
 org.eclipse.persistence.internal.sessions.AbstractSession writeSession,
 String seqName,
 int size)

Description copied from class: Sequence

INTERNAL: Return a Vector of newly-generated sequencing values. Used only in case preallocation is used (shouldUsePreallocation()==true). Accessor may be non-null only in case shouldUseSeparateConnection()==true. Even in this case accessor could be null - if SequencingControl().shouldUseSeparateConnection()==false; Therefore in case shouldUseSeparateConnection()==true, implementation should handle both cases: use a separate connection if provided (accessor != null), or get by without it (accessor == null).

Specified by:

getGeneratedVector in class Sequence

Parameters:

accessor - Accessor is a separate sequencing accessor (may be null);

writeSession - Session is a Session used for writing (either ClientSession or DatabaseSession);

seqName - String is sequencing number field name

size - int number of values to preallocate (output Vector size).

onConnect

public void onConnect()

Description copied from class: Sequence

INTERNAL: This method is called when Sequencing object is created. If it requires initialization, subclass should override this method.

Specified by:

onConnect in class Sequence

onDisconnect

public void onDisconnect()

Description copied from class: Sequence

INTERNAL: This method is called when Sequencing object is destroyed. If it requires deinitialization, subclass should override this method.

Specified by:

onDisconnect in class Sequence

shouldAcquireValueAfterInsert

public boolean shouldAcquireValueAfterInsert()

Description copied from class: Sequence

INTERNAL: Indicates whether sequencing value should be acquired after INSERT. Note that preallocation could be used only in case sequencing values should be acquired before insert (this method returns false). In default implementation, it is true for table sequencing and native sequencing on Oracle platform, false for native sequencing on other platforms.

Specified by:

shouldAcquireValueAfterInsert in class Sequence

shouldUseTransaction

public boolean shouldUseTransaction()

Description copied from class: Sequence

INTERNAL: Indicates whether TopLink should internally call beginTransaction() before getGeneratedValue/Vector, and commitTransaction after. In default implementation, it is true for table sequencing and false for native sequencing.

Specified by:

shouldUseTransaction in class Sequence

shouldUsePreallocation

public boolean shouldUsePreallocation()

Description copied from class: Sequence

INTERNAL: Indicates whether several sequencing values should be acquired at a time and be kept by TopLink. This in only possible in case sequencing numbers should be acquired before insert (shouldAcquireValueAfterInsert()==false). In default implementation, it is true for table sequencing and native sequencing on Oracle platform, false for native sequencing on other platforms.

Overrides:

shouldUsePreallocation in class Sequence