ca.uhn.hl7v2.util.idgenerator

Class HiLoGenerator

java.lang.Object

ca.uhn.hl7v2.util.idgenerator.IDGenerator.OrderedSupport

ca.uhn.hl7v2.util.idgenerator.HiLoGenerator

All Implemented Interfaces:

IDGenerator, IDGenerator.Ordered

Direct Known Subclasses:

DelegatingHiLoGenerator

public abstract class HiLoGenerator
extends IDGenerator.OrderedSupport

Abstract base class for a HiLo-style generator that cheaply generates "lo" IDs in memory but only seldomly increments (potentially more expensive) a "hi" ID, e.g. in a persistent store. The combination of "lo" and "hi" ID becomes the final ID returned to the caller.

Author:

Christian Ohr

Nested Class Summary

Nested classes/interfaces inherited from interface ca.uhn.hl7v2.util.idgenerator.IDGenerator

IDGenerator.Ordered, IDGenerator.OrderedSupport

Constructor Summary

Constructors

Constructor and Description
HiLoGenerator()

Method Summary

Methods

Modifier and Type	Method and Description
String	getID() Generates and returns a new ID.
abstract int	getMaxLo()
protected abstract int	getNextHiId()
protected int	getNextLoId()
void	reset()
protected abstract void	resetHiId()

Methods inherited from class ca.uhn.hl7v2.util.idgenerator.IDGenerator.OrderedSupport

getIncrement

Methods inherited from class java.lang.Object

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

Constructor Detail

HiLoGenerator

public HiLoGenerator()

Method Detail

getID

public String getID()
             throws IOException

Description copied from interface: IDGenerator

Generates and returns a new ID. Note: This method must be implemented to be thread-safe.

Returns:

a new ID.

Throws:

IOException

getNextHiId

protected abstract int getNextHiId()
                            throws IOException

Throws:

IOException

resetHiId

protected abstract void resetHiId()

getNextLoId

protected int getNextLoId()

reset

public void reset()

Specified by:

reset in interface IDGenerator.Ordered

Overrides:

reset in class IDGenerator.OrderedSupport

getMaxLo

public abstract int getMaxLo()