org.uncommons.util.id
Class CompositeIDSource

java.lang.Object
  org.uncommons.util.id.CompositeIDSource

All Implemented Interfaces:

IDSource<Long>

public final class CompositeIDSource
extends Object
implements IDSource<Long>

Thread-safe source for partitioned unique IDs. A single instance of this class represents a single 'partition' in the space of possible IDs. By creating multiple instances with different discriminators, multiple entities may generate globally unique IDs independently.

Any given instance of this class may generate a maximum of 2^31 unique values (the most significant 4 bytes are fixed and the least significant 4 bytes vary in sequence).

Author:

Daniel Dyer

Constructor Summary

CompositeIDSource(int topPart)

Method Summary

Long	nextID() Implementing classes are responsible for synchronization if concurrent invocations of this method are required.

Methods inherited from class java.lang.Object

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

Constructor Detail

CompositeIDSource

public CompositeIDSource(int topPart)

Parameters:

topPart - The most significant 32 bits to use for the 64-bit IDs generated by this source. All IDs generated by this source will have the same top 4 bytes.

Method Detail

nextID

public Long nextID()

Implementing classes are responsible for synchronization if concurrent invocations of this method are required.

Specified by:

nextID in interface IDSource<Long>

Returns:

The next ID.