org.apache.cassandra.io.util

Class Memory

java.lang.Object

org.apache.cassandra.io.util.Memory

All Implemented Interfaces:

java.lang.AutoCloseable

Direct Known Subclasses:

RefCountedMemory, SafeMemory

public class Memory
extends java.lang.Object
implements java.lang.AutoCloseable

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
protected long	size

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	Memory(long bytes)
protected	Memory(Memory copyOf)

Method Summary

Modifier and Type	Method and Description
static Memory	allocate(long bytes)
java.nio.ByteBuffer[]	asByteBuffers(long offset, long length)
protected void	checkBounds(long start, long end)
void	close()
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)
void	setShort(long offset, short l)
long	size()
java.lang.String	toString()
protected static java.lang.String	toString(long peer, long size)

Methods inherited from class java.lang.Object

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

Field Detail

peer

protected long peer

size

protected final long size

Constructor Detail

Memory

protected Memory(long bytes)

Memory

protected Memory(Memory copyOf)

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)

setShort

public void setShort(long offset,
                     short 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

checkBounds

@Inline
protected void checkBounds(long start,
                                   long end)

put

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

copy

public Memory copy(long newSize)

free

public void free()

close

public void close()

Specified by:

close in interface java.lang.AutoCloseable

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(long offset,
                                           long length)

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

toString

protected static java.lang.String toString(long peer,
                                           long size)