CleanerUtil (Pinot Segment Service Provider Interface 0.12.1 API)

java.lang.Object
- org.apache.pinot.segment.spi.memory.CleanerUtil

```
public final class CleanerUtil
extends Object
```
sun.misc.Cleaner has moved in OpenJDK 9 and sun.misc.Unsafe#invokeCleaner(ByteBuffer) is the replacement. This class is a hack to use sun.misc.Cleaner in Java 8 and use the replacement in Java 9+. This implementation is shamelessly borrowed from HADOOP-12760.

Nested Class Summary

Nested Classes
Modifier and Type Class Description

static interface CleanerUtil.BufferCleaner
Pass in an implementation of this interface to cleanup ByteBuffers.

Field Summary

Fields
Modifier and Type	Field	Description
`static String`	`UNMAP_NOT_SUPPORTED_REASON`	if `UNMAP_SUPPORTED` is `false`, this contains the reason why unmapping is not supported.
`static boolean`	`UNMAP_SUPPORTED`	`true`, if this platform supports unmapping mmapped files.

Method Summary

Modifier and Type Method Description

static void cleanQuietly(ByteBuffer buffer)

static CleanerUtil.BufferCleaner getCleaner()
Reference to a BufferCleaner that does unmapping.
- Methods inherited from class java.lang.Object
  clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - UNMAP_SUPPORTED
```
public static final boolean UNMAP_SUPPORTED
```
    true, if this platform supports unmapping mmapped files.
  - UNMAP_NOT_SUPPORTED_REASON
```
public static final String UNMAP_NOT_SUPPORTED_REASON
```
    if UNMAP_SUPPORTED is false, this contains the reason why unmapping is not supported.
- Method Detail
  - getCleaner
```
public static CleanerUtil.BufferCleaner getCleaner()
```
    Reference to a BufferCleaner that does unmapping.
    
    Returns:
    
    null if not supported.
  - cleanQuietly
```
public static void cleanQuietly(ByteBuffer buffer)
```