UUIDSequence (EclipseLink 2.6.4, API Reference)

java.lang.Object
- org.eclipse.persistence.sequencing.Sequence
- - org.eclipse.persistence.sequencing.UUIDSequence

All Implemented Interfaces:

java.io.Serializable, java.lang.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 and Description

UUIDSequence()

UUIDSequence(java.lang.String name)

Constructors
Constructor and Description
`UUIDSequence()`
`UUIDSequence(java.lang.String name)`

Method Summary

Methods
Modifier and Type	Method and Description
`java.lang.Object`	`getGeneratedValue(org.eclipse.persistence.internal.databaseaccess.Accessor accessor, org.eclipse.persistence.internal.sessions.AbstractSession writeSession, java.lang.String seqName)` INTERNAL: Return the newly-generated sequencing value.
`java.util.Vector`	`getGeneratedVector(org.eclipse.persistence.internal.databaseaccess.Accessor accessor, org.eclipse.persistence.internal.sessions.AbstractSession writeSession, java.lang.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, 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, hashCode, notify, notifyAll, wait, wait, wait

- Constructor Detail
  - UUIDSequence
```
public UUIDSequence()
```
  - UUIDSequence
```
public UUIDSequence(java.lang.String name)
```
- Method Detail
  - getGeneratedValue
```
public java.lang.Object getGeneratedValue(org.eclipse.persistence.internal.databaseaccess.Accessor accessor,
                                 org.eclipse.persistence.internal.sessions.AbstractSession writeSession,
                                 java.lang.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 java.util.Vector getGeneratedVector(org.eclipse.persistence.internal.databaseaccess.Accessor accessor,
                                  org.eclipse.persistence.internal.sessions.AbstractSession writeSession,
                                  java.lang.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

Class UUIDSequence

Field Summary

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

Constructor Summary

Method Summary

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

Methods inherited from class java.lang.Object

Constructor Detail

UUIDSequence

UUIDSequence

Method Detail

getGeneratedValue

getGeneratedVector

onConnect

onDisconnect

shouldAcquireValueAfterInsert

shouldUseTransaction

shouldUsePreallocation