Class MemoryUnmapper

java.lang.Object

org.h2.util.MemoryUnmapper

public final class MemoryUnmapper
extends Object

Unsafe memory unmapper.

See Also:

• SysProperties.NIO_CLEANER_HACK

Field Summary

Fields

Modifier and Type	Field	Description
private static final boolean	ENABLED
private static final Method	INVOKE_CLEANER
private static final Object	UNSAFE

Constructor Summary

Constructors

Modifier	Constructor	Description
private	MemoryUnmapper()

Method Summary

Modifier and Type	Method	Description
static boolean	unmap(ByteBuffer buffer)	Tries to unmap memory for the specified byte buffer using Java internals in unsafe way if SysProperties.NIO_CLEANER_HACK is enabled and access is not denied by a security manager.

Methods inherited from class Object

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

Field Details

ENABLED

private static final boolean ENABLED

UNSAFE

private static final Object UNSAFE

INVOKE_CLEANER

private static final Method INVOKE_CLEANER

Constructor Details

MemoryUnmapper

private MemoryUnmapper()

Method Details

unmap

public static boolean unmap(ByteBuffer buffer)

Tries to unmap memory for the specified byte buffer using Java internals in unsafe way if SysProperties.NIO_CLEANER_HACK is enabled and access is not denied by a security manager.

Parameters:

buffer - mapped byte buffer

Returns:

whether operation was successful