Package dev.getelements.elements.rt.transact.unix

Class UnixFSMemoryUtils

java.lang.Object

dev.getelements.elements.rt.transact.unix.UnixFSMemoryUtils

public abstract class UnixFSMemoryUtils
extends Object

Some dirty hacks to support atomic memory access.

Constructor Summary

Constructors

Constructor	Description
UnixFSMemoryUtils()

Method Summary

Modifier and Type	Method	Description
UnixFSAtomicLong	getAtomicLong(ByteBuffer byteBuffer)	Makes an instance of UnixFSAtomicLong from for details.
abstract UnixFSAtomicLong	getAtomicLong(ByteBuffer byteBuffer, int position)	Gets a UnixFSAtomicLong with the supplied ByteBuffer.
static UnixFSMemoryUtils	getInstance()	Gets the instance of the UnixFSMemoryUtils based on the system configuration.

Methods inherited from class java.lang.Object

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

Constructor Details

UnixFSMemoryUtils

public UnixFSMemoryUtils()

Method Details

getInstance

public static UnixFSMemoryUtils getInstance()

Gets the instance of the UnixFSMemoryUtils based on the system configuration.

Returns:

the instance of UnixFSMemoryUtils

getAtomicLong

public UnixFSAtomicLong getAtomicLong(ByteBuffer byteBuffer)

Makes an instance of UnixFSAtomicLong from for details.

getAtomicLong

public abstract UnixFSAtomicLong getAtomicLong(ByteBuffer byteBuffer,
 int position)

Gets a UnixFSAtomicLong with the supplied ByteBuffer. The 64-bit counter object will be placed at the ByteBuffer's Buffer.position(). The ByteBuffer's position is unchanged. This presumes that the Buffer.position() is properly aligned for this type of atomic operation and if it is not, then undefined behavior may result.

Parameters:

byteBuffer - the ByteBuffer

position - the positing within the ByteBuffer

Returns:

the UnixFSAtomicLong

Throws:

IllegalArgumentException - if this method can detect misalignment, or otherwise improper use