org.apache.cassandra.io.util

Class Memory

java.lang.Object

org.apache.cassandra.io.util.Memory

Direct Known Subclasses:

RefCountedMemory

public class Memory
extends java.lang.Object

An off-heap region of memory that must be manually free'd when no longer needed.

Field Summary

Fields

Modifier and Type	Field and Description
protected long	peer

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	Memory(long bytes)

Method Summary

Methods

Modifier and Type	Method and Description
static Memory	allocate(long bytes)
java.nio.ByteBuffer[]	asByteBuffers()
Memory	copy(long newSize)
boolean	equals(java.lang.Object o)
void	free()
byte	getByte(long offset)
void	getBytes(long memoryOffset, byte[] buffer, int bufferOffset, int count) Transfers count bytes from Memory starting at memoryOffset to buffer starting at bufferOffset
int	getInt(long offset)
long	getLong(long offset)
void	put(long trgOffset, Memory memory, long srcOffset, long size)
void	setByte(long offset, byte b)
void	setBytes(long memoryOffset, byte[] buffer, int bufferOffset, int count) Transfers count bytes from buffer to Memory
void	setBytes(long memoryOffset, java.nio.ByteBuffer buffer)
void	setInt(long offset, int l)
void	setLong(long offset, long l)
void	setMemory(long offset, long bytes, byte b)
long	size()

Methods inherited from class java.lang.Object

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

Field Detail

peer

protected long peer

Constructor Detail

Memory

protected Memory(long bytes)

Method Detail

allocate

public static Memory allocate(long bytes)

setByte

public void setByte(long offset,
           byte b)

setMemory

public void setMemory(long offset,
             long bytes,
             byte b)

setLong

public void setLong(long offset,
           long l)

setInt

public void setInt(long offset,
          int l)

setBytes

public void setBytes(long memoryOffset,
            java.nio.ByteBuffer buffer)

setBytes

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

Transfers count bytes from buffer to Memory

Parameters:

memoryOffset - start offset in the memory

buffer - the data buffer

bufferOffset - start offset of the buffer

count - number of bytes to transfer

getByte

public byte getByte(long offset)

getLong

public long getLong(long offset)

getInt

public int getInt(long offset)

getBytes

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

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

Parameters:

memoryOffset - start offset in the memory

buffer - the data buffer

bufferOffset - start offset of the buffer

count - number of bytes to transfer

put

public void put(long trgOffset,
       Memory memory,
       long srcOffset,
       long size)

copy

public Memory copy(long newSize)

free

public void free()

size

public long size()

equals

public boolean equals(java.lang.Object o)

Overrides:

equals in class java.lang.Object

asByteBuffers

public java.nio.ByteBuffer[] asByteBuffers()