Package org.apache.cassandra.utils.memory

Class MemoryUtil

java.lang.Object

org.apache.cassandra.utils.memory.MemoryUtil

Direct Known Subclasses:

LittleEndianMemoryUtil, NativeEndianMemoryUtil

public abstract class MemoryUtil
extends Object

Field Summary

Fields

Modifier and Type	Field	Description
protected static final Class<?>	BYTE_BUFFER_CLASS
protected static final sun.misc.Unsafe	unsafe

Constructor Summary

Constructors

Constructor	Description
MemoryUtil()

Method Summary

Modifier and Type	Method	Description
static long	allocate(long size)
static ByteBuffer	duplicateDirectByteBuffer(ByteBuffer source, ByteBuffer hollowBuffer)
static void	free(long peer)
static long	getAddress(ByteBuffer buffer)
static Object	getAttachment(ByteBuffer instance)
static byte	getByte(long address)
static ByteBuffer	getByteBuffer(long address, int length)
static ByteBuffer	getByteBuffer(long address, int length, ByteOrder order)
static void	getBytes(long address, byte[] buffer, int bufferOffset, int count)	Transfers count bytes from Memory starting at memoryOffset to buffer starting at bufferOffset
static ByteBuffer	getHollowDirectByteBuffer()
static ByteBuffer	getHollowDirectByteBuffer(ByteOrder order)
static boolean	isExactlyDirect(ByteBuffer buffer)
static int	pageSize()
static void	setAttachment(ByteBuffer instance, Object next)
static void	setByte(long address, byte b)
static void	setByte(long address, int count, byte b)
static void	setByteBufferCapacity(ByteBuffer instance, int capacity)
static void	setBytes(byte[] src, int offset, long trg, long count)
static void	setBytes(long address, byte[] buffer, int bufferOffset, int count)	Transfers count bytes from buffer to Memory
static void	setBytes(long src, long trg, long count)
static void	setBytes(long address, ByteBuffer buffer)
static void	setDirectByteBuffer(ByteBuffer instance, long address, int length)
static ByteBuffer	sliceDirectByteBuffer(ByteBuffer source, ByteBuffer hollowBuffer, int offset, int length)

Methods inherited from class java.lang.Object

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

Field Details

unsafe

protected static final sun.misc.Unsafe unsafe

BYTE_BUFFER_CLASS

protected static final Class<?> BYTE_BUFFER_CLASS

Constructor Details

MemoryUtil

public MemoryUtil()

Method Details

pageSize

public static int pageSize()

getAddress

public static long getAddress(ByteBuffer buffer)

allocate

public static long allocate(long size)

free

public static void free(long peer)

setByte

public static void setByte(long address,
 byte b)

setByte

public static void setByte(long address,
 int count,
 byte b)

getByte

public static byte getByte(long address)

getByteBuffer

public static ByteBuffer getByteBuffer(long address,
 int length)

getByteBuffer

public static ByteBuffer getByteBuffer(long address,
 int length,
 ByteOrder order)

getHollowDirectByteBuffer

public static ByteBuffer getHollowDirectByteBuffer()

getHollowDirectByteBuffer

public static ByteBuffer getHollowDirectByteBuffer(ByteOrder order)

isExactlyDirect

public static boolean isExactlyDirect(ByteBuffer buffer)

getAttachment

public static Object getAttachment(ByteBuffer instance)

setAttachment

public static void setAttachment(ByteBuffer instance,
 Object next)

duplicateDirectByteBuffer

public static ByteBuffer duplicateDirectByteBuffer(ByteBuffer source,
 ByteBuffer hollowBuffer)

sliceDirectByteBuffer

public static ByteBuffer sliceDirectByteBuffer(ByteBuffer source,
 ByteBuffer hollowBuffer,
 int offset,
 int length)

setDirectByteBuffer

public static void setDirectByteBuffer(ByteBuffer instance,
 long address,
 int length)

setByteBufferCapacity

public static void setByteBufferCapacity(ByteBuffer instance,
 int capacity)

setBytes

public static void setBytes(long address,
 ByteBuffer buffer)

setBytes

public static void setBytes(long address,
 byte[] buffer,
 int bufferOffset,
 int count)

Transfers count bytes from buffer to Memory

Parameters:

address - start offset in the memory

buffer - the data buffer

bufferOffset - start offset of the buffer

count - number of bytes to transfer

setBytes

public static void setBytes(long src,
 long trg,
 long count)

setBytes

public static void setBytes(byte[] src,
 int offset,
 long trg,
 long count)

getBytes

public static void getBytes(long address,
 byte[] buffer,
 int bufferOffset,
 int count)

Transfers count bytes from Memory starting at memoryOffset to buffer starting at bufferOffset

Parameters:

address - start offset in the memory

buffer - the data buffer

bufferOffset - start offset of the buffer

count - number of bytes to transfer