Package org.apache.openjpa.kernel

Class TimeSeededSeq

java.lang.Object

org.apache.openjpa.kernel.TimeSeededSeq

All Implemented Interfaces:

Seq, Closeable

public class TimeSeededSeq
extends Object
implements Seq

A simplistic implementation of a Seq used to provide datastore ids. Starts with an id equal to the system's current time in milliseconds and increments from there.

Author:

Greg Campbell

Field Summary

Fields inherited from interface org.apache.openjpa.kernel.Seq

TYPE_CONTIGUOUS, TYPE_DEFAULT, TYPE_NONTRANSACTIONAL, TYPE_TRANSACTIONAL

Constructor Summary

Constructors

Constructor	Description
TimeSeededSeq()

Method Summary

Modifier and Type	Method	Description
void	allocate(int additional, StoreContext ctx, ClassMetaData meta)	Allocate additional values efficiently.
void	close()	Free resources used by this sequence.
Object	current(StoreContext ctx, ClassMetaData meta)	Return the current value of the sequence, or null if not available.
int	getIncrement()
Object	next(StoreContext ctx, ClassMetaData meta)	Return the next value in the sequence.
void	setIncrement(int increment)
void	setType(int type)	Set the type of sequence.

Methods inherited from class java.lang.Object

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

Constructor Detail

TimeSeededSeq

public TimeSeededSeq()

Method Detail

setType

public void setType(int type)

Description copied from interface: Seq

Set the type of sequence.

Specified by:

setType in interface Seq

getIncrement

public int getIncrement()

setIncrement

public void setIncrement(int increment)

next

public Object next(StoreContext ctx,
                   ClassMetaData meta)

Description copied from interface: Seq

Return the next value in the sequence.

Specified by:

next in interface Seq

Parameters:

ctx - the current context

meta - if this is a datastore identity sequence, the persistent class the identity value is for; else null

current

public Object current(StoreContext ctx,
                      ClassMetaData meta)

Description copied from interface: Seq

Return the current value of the sequence, or null if not available.

Specified by:

current in interface Seq

Parameters:

ctx - the current context

meta - if this is a datastore identity sequence, the persistent class the identity value is for; else null

allocate

public void allocate(int additional,
                     StoreContext ctx,
                     ClassMetaData meta)

Description copied from interface: Seq

Allocate additional values efficiently.

Specified by:

allocate in interface Seq

ctx - the current context

meta - if this is a datastore identity sequence, the persistent class the identity value is for; else null

close

public void close()

Description copied from interface: Seq

Free resources used by this sequence.

Specified by:

close in interface Closeable

Specified by:

close in interface Seq