Package io.higson.runtime.hilo

Class HiLoSequenceGenerator

java.lang.Object

io.higson.runtime.hilo.HiLoSequenceGenerator

All Implemented Interfaces:

IdentifierGenerator

public class HiLoSequenceGenerator
extends Object
implements IdentifierGenerator

Classic hi-lo identifier generator. Reserves a contiguous buffer of allocationSize ids per single database round-trip.

Requires the underlying sequence to be declared with INCREMENT BY 1. Each nextval() returns a hi value; the generator multiplies it by allocationSize to derive the buffer boundaries.

For a sequence starting at 1 with INCREMENT BY 1 and allocationSize = 50:

• first nextval() returns 1 → buffer [50, 99]
• second nextval() returns 2 → buffer [100, 149]

Thread-safe via an internal monitor; a single instance may be shared across concurrent callers.

Constructor Summary

Constructors

Constructor	Description
HiLoSequenceGenerator(String sequenceName, int allocationSize, IdentifierDao dao)

Method Summary

Modifier and Type	Method	Description
long	getNextId()
String	toString()

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Details

HiLoSequenceGenerator

public HiLoSequenceGenerator(String sequenceName,
 int allocationSize,
 IdentifierDao dao)

Method Details

getNextId

public long getNextId()

Specified by:

getNextId in interface IdentifierGenerator

toString

public String toString()

Overrides:

toString in class Object