org.apache.pulsar.sql.presto.util

Class NoStrictCacheSizeAllocator

java.lang.Object

org.apache.pulsar.sql.presto.util.NoStrictCacheSizeAllocator

All Implemented Interfaces:

CacheSizeAllocator

public class NoStrictCacheSizeAllocator
extends Object
implements CacheSizeAllocator

Cache size allocator.

Constructor Summary

Constructors

Constructor and Description
NoStrictCacheSizeAllocator(long maxCacheSize)

Method Summary

Modifier and Type	Method and Description
void	allocate(long size) This operation will cost available cache size.
long	getAvailableCacheSize() Get available cache size.
void	release(long size) This method used to release used cache size and add available cache size.

Methods inherited from class java.lang.Object

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

Constructor Detail

NoStrictCacheSizeAllocator

public NoStrictCacheSizeAllocator(long maxCacheSize)

Method Detail

getAvailableCacheSize

public long getAvailableCacheSize()

Description copied from interface: CacheSizeAllocator

Get available cache size.

Specified by:

getAvailableCacheSize in interface CacheSizeAllocator

Returns:

available cache size

allocate

public void allocate(long size)

This operation will cost available cache size. if the request size exceed the available size, it's should be allowed, because maybe one entry size exceed the size and the query must be finished, the available size will become invalid.

Specified by:

allocate in interface CacheSizeAllocator

Parameters:

size - allocate size

release

public void release(long size)

This method used to release used cache size and add available cache size. in normal case, the available size shouldn't exceed max cache size.

Specified by:

release in interface CacheSizeAllocator

Parameters:

size - release size