org.apache.hadoop.yarn.util

Class LRUCacheHashMap<K,V>

java.lang.Object

java.util.AbstractMap<K,V>

java.util.HashMap<K,V>

java.util.LinkedHashMap<K,V>

org.apache.hadoop.yarn.util.LRUCacheHashMap<K,V>

All Implemented Interfaces:

Serializable, Cloneable, Map<K,V>

public class LRUCacheHashMap<K,V>
extends LinkedHashMap<K,V>

LRU cache with a configurable maximum cache size and access order.

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class java.util.AbstractMap

AbstractMap.SimpleEntry<K,V>, AbstractMap.SimpleImmutableEntry<K,V>

Constructor Summary

Constructors

Constructor and Description
LRUCacheHashMap(int maxSize, boolean accessOrder) Constructor.

Method Summary

Methods

Modifier and Type	Method and Description
protected boolean	removeEldestEntry(Map.Entry<K,V> eldest)

Methods inherited from class java.util.LinkedHashMap

clear, containsValue, get

Methods inherited from class java.util.HashMap

clone, containsKey, entrySet, isEmpty, keySet, put, putAll, remove, size, values

Methods inherited from class java.util.AbstractMap

equals, hashCode, toString

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Map

containsKey, entrySet, equals, hashCode, isEmpty, keySet, put, putAll, remove, size, values

Constructor Detail

LRUCacheHashMap

public LRUCacheHashMap(int maxSize,
               boolean accessOrder)

Constructor.

Parameters:

maxSize - max size of the cache

accessOrder - true for access-order, false for insertion-order

Method Detail

removeEldestEntry

protected boolean removeEldestEntry(Map.Entry<K,V> eldest)

Overrides:

removeEldestEntry in class LinkedHashMap<K,V>