Package org.apache.arrow.memory.util

Class MemoryUtil

java.lang.Object

org.apache.arrow.memory.util.MemoryUtil

public class MemoryUtil
extends Object

Utilities for memory related operations.

Field Summary

Fields

Modifier and Type	Field	Description
static final long	BYTE_ARRAY_BASE_OFFSET	The start offset of array data relative to the start address of the array object.
static final boolean	LITTLE_ENDIAN	If the native byte order is little-endian.
static final sun.misc.Unsafe	UNSAFE	The unsafe object from which to access the off-heap memory.

Method Summary

Modifier and Type	Method	Description
static void	copyMemory(@Nullable Object srcBase, long srcOffset, @Nullable Object destBase, long destOffset, long bytes)
static ByteBuffer	directBuffer(long address, int capacity)	Create nio byte buffer.
static long	getByteBufferAddress(ByteBuffer buf)	Given a ByteBuffer, gets the address the underlying memory space.

Methods inherited from class java.lang.Object

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

Field Details

UNSAFE

public static final sun.misc.Unsafe UNSAFE

The unsafe object from which to access the off-heap memory.

BYTE_ARRAY_BASE_OFFSET

public static final long BYTE_ARRAY_BASE_OFFSET

The start offset of array data relative to the start address of the array object.

LITTLE_ENDIAN

public static final boolean LITTLE_ENDIAN

If the native byte order is little-endian.

Method Details

getByteBufferAddress

public static long getByteBufferAddress(ByteBuffer buf)

Given a ByteBuffer, gets the address the underlying memory space.

Parameters:

buf - the byte buffer.

Returns:

address of the underlying memory.

directBuffer

public static ByteBuffer directBuffer(long address,
 int capacity)

Create nio byte buffer.

copyMemory

public static void copyMemory(@Nullable Object srcBase,
 long srcOffset,
 @Nullable Object destBase,
 long destOffset,
 long bytes)