org.apache.cassandra.utils.memory

Class MemoryUtil

java.lang.Object

org.apache.cassandra.utils.memory.MemoryUtil

public abstract class MemoryUtil
extends java.lang.Object

Field Summary

Fields

Modifier and Type	Field and Description
static boolean	INVERTED_ORDER

Constructor Summary

Constructors

Constructor and Description
MemoryUtil()

Method Summary

Methods

Modifier and Type	Method and Description
static long	allocate(long size)
static java.nio.ByteBuffer	duplicateByteBuffer(java.nio.ByteBuffer source, java.nio.ByteBuffer hollowBuffer)
static java.nio.ByteBuffer	duplicateDirectByteBuffer(java.nio.ByteBuffer source, java.nio.ByteBuffer hollowBuffer)
static void	free(long peer)
static byte	getByte(long address)
static java.nio.ByteBuffer	getByteBuffer(long address, int length)
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 java.nio.ByteBuffer	getHollowByteBuffer()
static java.nio.ByteBuffer	getHollowDirectByteBuffer()
static int	getInt(long address)
static int	getIntByByte(long address)
static long	getLong(long address)
static long	getLongByByte(long address)
static int	getShort(long address)
static int	getShortByByte(long address)
static void	putIntByByte(long address, int value)
static void	putLongByByte(long address, long value)
static void	setByte(long address, byte b)
static void	setByteBuffer(java.nio.ByteBuffer instance, long address, int length)
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 address, java.nio.ByteBuffer buffer)
static void	setBytes(long src, long trg, long count)
static void	setInt(long address, int l)
static void	setLong(long address, long l)
static void	setShort(long address, short s)

Methods inherited from class java.lang.Object

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

Field Detail

INVERTED_ORDER

public static final boolean INVERTED_ORDER

Constructor Detail

MemoryUtil

public MemoryUtil()

Method Detail

allocate

public static long allocate(long size)

free

public static void free(long peer)

setByte

public static void setByte(long address,
           byte b)

setShort

public static void setShort(long address,
            short s)

setInt

public static void setInt(long address,
          int l)

setLong

public static void setLong(long address,
           long l)

getByte

public static byte getByte(long address)

getShort

public static int getShort(long address)

getInt

public static int getInt(long address)

getLong

public static long getLong(long address)

getByteBuffer

public static java.nio.ByteBuffer getByteBuffer(long address,
                                int length)

getHollowDirectByteBuffer

public static java.nio.ByteBuffer getHollowDirectByteBuffer()

getHollowByteBuffer

public static java.nio.ByteBuffer getHollowByteBuffer()

setByteBuffer

public static void setByteBuffer(java.nio.ByteBuffer instance,
                 long address,
                 int length)

duplicateDirectByteBuffer

public static java.nio.ByteBuffer duplicateDirectByteBuffer(java.nio.ByteBuffer source,
                                            java.nio.ByteBuffer hollowBuffer)

duplicateByteBuffer

public static java.nio.ByteBuffer duplicateByteBuffer(java.nio.ByteBuffer source,
                                      java.nio.ByteBuffer hollowBuffer)

getLongByByte

public static long getLongByByte(long address)

getIntByByte

public static int getIntByByte(long address)

getShortByByte

public static int getShortByByte(long address)

putLongByByte

public static void putLongByByte(long address,
                 long value)

putIntByByte

public static void putIntByByte(long address,
                int value)

setBytes

public static void setBytes(long address,
            java.nio.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