de.caluga.morphium

Class SequenceGenerator

java.lang.Object

de.caluga.morphium.SequenceGenerator

public class SequenceGenerator
extends Object

User: Stephan Bösebeck Date: 24.07.12 Time: 21:36

Generate a new unique sequence number. Uses Sequence to store the current value. Process is as follows:

• lock the entry in sequence collection with my own UUID (rather unique) using atomar $set operation
• read my locked entries (should only be one). If one is found, I have a valid lock. If not found, somebody locked over. Wait a while and try again
• increase the number by one (or the given increment) on the locked element, get this value
• remove the lock (atomar using $set)
• return current value

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	SequenceGenerator.RecursionException

Constructor Summary

Constructors

Constructor and Description
SequenceGenerator(Morphium m, String n)
SequenceGenerator(Morphium mrph, String name, int inc, long startValue)

Method Summary

Modifier and Type	Method and Description
long	getCurrentValue()
String	getId()
int	getInc()
Morphium	getMorphium()
String	getName()
long	getNextValue()
long	getStartValue()
void	setId(String id)
void	setInc(int inc)
void	setMorphium(Morphium morphium)
void	setName(String name)
void	setStartValue(long startValue)

Methods inherited from class java.lang.Object

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

Constructor Detail

SequenceGenerator

public SequenceGenerator(Morphium m,
                         String n)

SequenceGenerator

public SequenceGenerator(Morphium mrph,
                         String name,
                         int inc,
                         long startValue)

Method Detail

getCurrentValue

public long getCurrentValue()

getNextValue

public long getNextValue()

getInc

public int getInc()

setInc

public void setInc(int inc)

getStartValue

public long getStartValue()

setStartValue

public void setStartValue(long startValue)

getId

public String getId()

setId

public void setId(String id)

getName

public String getName()

setName

public void setName(String name)

getMorphium

public Morphium getMorphium()

setMorphium

public void setMorphium(Morphium morphium)