org.hypergraphdb

Interface HGPersistentHandle

All Superinterfaces:

Comparable<HGPersistentHandle>, HGHandle, Serializable

All Known Implementing Classes:

IntPersistentHandle, LongPersistentHandle, UUIDPersistentHandle

public interface HGPersistentHandle
extends HGHandle, Serializable, Comparable<HGPersistentHandle>

A HGPersistentHandle is a HGHandle that survives system downtime. That is, a permanent handle will be valid between startup and shutdown of a HyperGraph based application.

A concrete implementation is guaranteed to be a compact, serialiazable Java object that can be stored by the application using some other means and reused to refer to the same atom in subsequent runs of the same HyperGraph instance, or within a distributed environment.

Generally, plain HGHandle implementation are designed for fast, in-memory access whereas HGPersistentHandle are designed as a persistent, long-term reference.

Author:

Borislav Iordanov

See Also:

HGHandleFactory

Method Summary

Methods

Modifier and Type	Method and Description
byte[]	toByteArray() Return a byte[] representation of the handle.

Methods inherited from interface org.hypergraphdb.HGHandle

getPersistent

Methods inherited from interface java.lang.Comparable

compareTo

Method Detail

toByteArray

byte[] toByteArray()

Return a byte[] representation of the handle. Note that byte[] representations of all handles will be of the same size. For example 4 for integer based handles, or 16 for UUID based handles.