Class UUIDSequence
- java.lang.Object
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- org.eclipse.persistence.sequencing.Sequence
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- org.eclipse.persistence.sequencing.UUIDSequence
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- All Implemented Interfaces:
java.io.Serializable,java.lang.Cloneable
public class UUIDSequence extends Sequence
- See Also:
- Serialized Form
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Field Summary
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Fields inherited from class org.eclipse.persistence.sequencing.Sequence
depth, initialValue, isCustomQualifier, name, platform, qualifier, shouldAlwaysOverrideExistingValue, size
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Constructor Summary
Constructors Constructor Description UUIDSequence()UUIDSequence(java.lang.String name)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description java.lang.ObjectgetGeneratedValue(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.VectorgetGeneratedVector(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.voidonConnect()INTERNAL: This method is called when Sequencing object is created.voidonDisconnect()INTERNAL: This method is called when Sequencing object is destroyed.booleanshouldAcquireValueAfterInsert()INTERNAL: Indicates whether sequencing value should be acquired after INSERT.booleanshouldUsePreallocation()INTERNAL: Indicates whether several sequencing values should be acquired at a time and be kept by TopLink.booleanshouldUseTransaction()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
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Method Detail
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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:SequenceINTERNAL: 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:
getGeneratedValuein classSequence- 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
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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:SequenceINTERNAL: 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:
getGeneratedVectorin classSequence- 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 namesize- int number of values to preallocate (output Vector size).
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onConnect
public void onConnect()
Description copied from class:SequenceINTERNAL: This method is called when Sequencing object is created. If it requires initialization, subclass should override this method.
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onDisconnect
public void onDisconnect()
Description copied from class:SequenceINTERNAL: This method is called when Sequencing object is destroyed. If it requires deinitialization, subclass should override this method.- Specified by:
onDisconnectin classSequence
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shouldAcquireValueAfterInsert
public boolean shouldAcquireValueAfterInsert()
Description copied from class:SequenceINTERNAL: 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:
shouldAcquireValueAfterInsertin classSequence
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shouldUseTransaction
public boolean shouldUseTransaction()
Description copied from class:SequenceINTERNAL: 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:
shouldUseTransactionin classSequence
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shouldUsePreallocation
public boolean shouldUsePreallocation()
Description copied from class:SequenceINTERNAL: 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:
shouldUsePreallocationin classSequence
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