Package com.illumon.iris.db.v2.locations.parquet

Class PageCache<ATTR extends Attributes.Any>

java.lang.Object

com.illumon.util.datastructures.intrusive.IntrusiveSoftLRU<PageCache.IntrusivePage<ATTR>>

com.illumon.iris.db.v2.locations.parquet.PageCache<ATTR>

public class PageCache<ATTR extends Attributes.Any>
extends IntrusiveSoftLRU<PageCache.IntrusivePage<ATTR>>

A Cache for IntrusivePages. This datastructure stores pages as soft references and maintains them as an LRU cache. Externally references can be held as WeakReferences so that as memory pressure builds they can be evicted from the cache.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	PageCache.IntrusivePage<ATTR extends Attributes.Any>	Intrusive data structure for page caching.

Nested classes/interfaces inherited from class com.illumon.util.datastructures.intrusive.IntrusiveSoftLRU

IntrusiveSoftLRU.Adapter<T>, IntrusiveSoftLRU.Node<T extends IntrusiveSoftLRU.Node<T>>

Constructor Summary

Constructors

Constructor	Description
PageCache(int initialSize, int maxSize)

Method Summary

Modifier and Type	Method	Description
<ATTR2 extends Attributes.Any> PageCache<ATTR2>	castAttr()
static <ATTR extends Attributes.Any> WeakReference<PageCache.IntrusivePage<ATTR>>	getNullPage()

Methods inherited from class com.illumon.util.datastructures.intrusive.IntrusiveSoftLRU

clear, touch

Methods inherited from class java.lang.Object

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

Constructor Details

PageCache

public PageCache(int initialSize, int maxSize)

Method Details

getNullPage

public static <ATTR extends Attributes.Any> WeakReference<PageCache.IntrusivePage<ATTR>> getNullPage()

Returns:

The null page sentinel

castAttr

public <ATTR2 extends Attributes.Any> PageCache<ATTR2> castAttr()