JDO Interface

Sequence

Implementations of this interface can be used to obtain sequences. The behavior with regard to the transaction and rollover behavior are defined in the metadata.
Since:
JDO 2.0

Public Methods

void allocate(int additional)
Provides a hint to the implementation that the application will need additional sequence value objects in short order.
There is no externally visible behavior of this method. It is used to potentially improve the efficiency of the algorithm of obtaining additional sequence value objects.
Parameters:
additional - the number of additional values to allocate
Since:
JDO 2.0
Object current()
Returns the current sequence value object if it is available.
It is intended to return a sequence value object previously used. If the current sequence value is not available, throw JDODataStoreException.
Return:
the current value
Since:
JDO 2.0
long currentValue()
Returns the current sequence value as a long.
If the current sequence value is not available or is not numeric, throw JDODataStoreException.
Return:
the current value
Since:
JDO 2.0
String getName()
Returns the fully qualified name of the Sequence.
Return:
the name of the sequence
Since:
JDO 2.0
Object next()
Returns the next sequence value as an Object.
If the next sequence value is not available, throw JDODataStoreException.
Return:
the next value
Since:
JDO 2.0
long nextValue()
Returns the next sequence value as a long.
If the next sequence value is not available or is not numeric, throw JDODataStoreException.
Return:
the next value
Since:
JDO 2.0