org.cojen.tupl.io

Class DirectAccess

java.lang.Object

org.cojen.tupl.io.DirectAccess

public class DirectAccess
extends Object

Backdoor access to DirectByteBuffer.

Constructor Summary

Constructors

Constructor and Description
DirectAccess()

Method Summary

Modifier and Type	Method and Description
static long	getAddress(Buffer buf)
static boolean	isSupported()
ByteBuffer	prepare(long ptr, int length) Returns an instance-specific thread-local ByteBuffer which references any memory address.
static ByteBuffer	ref(long ptr, int length) Returns a thread-local ByteBuffer which references any memory address.
static ByteBuffer	ref2(long ptr, int length) Returns a second independent thread-local ByteBuffer.
static void	unref(ByteBuffer bb) Optionally unreference a buffer.

Methods inherited from class java.lang.Object

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

Constructor Detail

DirectAccess

public DirectAccess()

Throws:

UnsupportedOperationException - if not supported

Method Detail

prepare

public ByteBuffer prepare(long ptr,
                          int length)

Returns an instance-specific thread-local ByteBuffer which references any memory address. The position is set to zero, the limit and capacity are set to the given length.

Throws:

UnsupportedOperationException - if not supported

isSupported

public static boolean isSupported()

ref

public static ByteBuffer ref(long ptr,
                             int length)

Returns a thread-local ByteBuffer which references any memory address. The position is set to zero, the limit and capacity are set to the given length.

Throws:

UnsupportedOperationException - if not supported

ref2

public static ByteBuffer ref2(long ptr,
                              int length)

Returns a second independent thread-local ByteBuffer.

Throws:

UnsupportedOperationException - if not supported

getAddress

public static long getAddress(Buffer buf)

unref

public static void unref(ByteBuffer bb)

Optionally unreference a buffer. The garbage collector does not attempt to free memory referenced by a ByteBuffer created by this class.