MemoryUnmapper

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

```
public final class MemoryUnmapper
extends java.lang.Object
```
Unsafe memory unmapper.

See Also:

SysProperties.NIO_CLEANER_HACK

Field Summary

Fields
Modifier and Type Field Description

private static boolean ENABLED

private static java.lang.reflect.Method INVOKE_CLEANER

private static java.lang.Object UNSAFE

Constructor Summary

Constructors
Modifier Constructor Description

private MemoryUnmapper()

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`static boolean`	`unmap(java.nio.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 java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - ENABLED
```
private static final boolean ENABLED
```
  - UNSAFE
```
private static final java.lang.Object UNSAFE
```
  - INVOKE_CLEANER
```
private static final java.lang.reflect.Method INVOKE_CLEANER
```
- Constructor Detail
  - MemoryUnmapper
```
private MemoryUnmapper()
```
- Method Detail
  - unmap
```
public static boolean unmap(java.nio.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