public final Class MemoryUnmapper

Class Inheritance

extends Object

java.lang.Object
org.h2.util.MemoryUnmapper

Imports

java.lang.reflect.Field, .Method, java.nio.ByteBuffer, org.h2.engine.SysProperties

Unsafe memory unmapper.

See Also: SysProperties#NIO_CLEANER_HACK

Field Summary

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

Constructor Summary

Access	Constructor and Description
private	MemoryUnmapper()

Method Summary

Modifier and Type	Method and Description
public static boolean	Returns: whether operation was successful unmap(ByteBuffer mapped byte buffer 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.

Inherited from java.lang.Object:: clone equals finalize getClass hashCode notify notifyAll toString wait wait wait

Field Detail

ENABLED	back to summary
private static final boolean ENABLED

INVOKE_CLEANER	back to summary
private static final Method INVOKE_CLEANER

UNSAFE	back to summary
private static final Object UNSAFE

Constructor Detail

MemoryUnmapper	back to summary
private MemoryUnmapper()

Method Detail

unmap back to summary

unmap	back to summary
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:ByteBuffer mapped byte buffer Returns:boolean whether operation was successful

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:ByteBuffer: mapped byte buffer

Returns:boolean

whether operation was successful