Class ConcurrentWeakIdentityHashMap<K,V>

java.lang.Object

com.oracle.truffle.js.runtime.util.ConcurrentWeakIdentityHashMap<K,V>

All Implemented Interfaces:

Map<K,V>

public final class ConcurrentWeakIdentityHashMap<K,V>
extends Object
implements Map<K,V>

Thread-safe WeakHashMap alternative based on ConcurrentHashMap to avoid lock contention for lookups. Keys are compared by object identity. Keys and values must not be null. Inspired by jdk.internal.util.ReferencedKeyMap. Only partially implements the Map interface; unused methods are omitted for simplicity.

Nested Class Summary

Nested classes/interfaces inherited from interface java.util.Map

Map.Entry<K,V>

Method Summary

Modifier and Type	Method	Description
void	clear()
boolean	containsKey(Object key)
boolean	containsValue(Object value)
static <K,V> ConcurrentWeakIdentityHashMap<K,V>	create()
Set<Map.Entry<K,V>>	entrySet()
void	forEach(BiConsumer<? super K, ? super V> action)
V	get(Object key)
boolean	isEmpty()
Set<K>	keySet()
V	put(K key, V value)
void	putAll(Map<? extends K, ? extends V> m)
V	putIfAbsent(K key, V value)
V	remove(Object key)
boolean	remove(Object key, Object value)
int	size()
Collection<V>	values()

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Map

compute, computeIfAbsent, computeIfPresent, equals, getOrDefault, hashCode, merge, replace, replace, replaceAll

Method Details

create

public static <K,V>
ConcurrentWeakIdentityHashMap<K,V> create()

get

public V get(Object key)

Specified by:

get in interface Map<K,V>

containsKey

public boolean containsKey(Object key)

Specified by:

containsKey in interface Map<K,V>

containsValue

public boolean containsValue(Object value)

Specified by:

containsValue in interface Map<K,V>

put

public V put(K key,
 V value)

Specified by:

put in interface Map<K,V>

putIfAbsent

public V putIfAbsent(K key,
 V value)

Specified by:

putIfAbsent in interface Map<K,V>

clear

public void clear()

Specified by:

clear in interface Map<K,V>

remove

public V remove(Object key)

Specified by:

remove in interface Map<K,V>

remove

public boolean remove(Object key,
 Object value)

Specified by:

remove in interface Map<K,V>

forEach

public void forEach(BiConsumer<? super K, ? super V> action)

Specified by:

forEach in interface Map<K,V>

putAll

public void putAll(Map<? extends K, ? extends V> m)

Specified by:

putAll in interface Map<K,V>

size

public int size()

Specified by:

size in interface Map<K,V>

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface Map<K,V>

keySet

public Set<K> keySet()

Specified by:

keySet in interface Map<K,V>

values

public Collection<V> values()

Specified by:

values in interface Map<K,V>

entrySet

public Set<Map.Entry<K,V>> entrySet()

Specified by:

entrySet in interface Map<K,V>