DualLazyWeakMap<K extends Object, V extends Object> class

A lazily-managed variant of DualWeakMap.

Keys and values are held using LazyWeakReference, meaning entries start strongly referenced and automatically degrade to weak references over time (see LazyWeakReferenceManager).

This reduces allocation and GC overhead for recently accessed entries while still allowing unused ones to be garbage-collected.

See also: LazyWeakReference, LazyWeakReferenceManager.

Inheritance

Constructors

DualLazyWeakMap(LazyWeakReferenceManager<K> keyLazyRefManager, LazyWeakReferenceManager<V> valueLazyRefManager, {bool autoPurge = true, int autoPurgeThreshold = defaultAutoPurgeThreshold, OnPurgedValues<V>? onPurgedValues})

Properties

autoPurgeThreshold → int
Number of operations tolerated before auto-purge is triggered.
no setterinherited
entries → Iterable<MapEntry<K, V>>
The map entries of this Map.
no setterinherited
entriesSwapped → Iterable<MapEntry<V, K>>
Iterable of entries with key and value swapped. See DualWeakMap.swapped SwappedDualWeakMap
no setterinherited
hashCode → int
The hash code for this object.
no setterinherited
isAutoPurgeEnabled → bool
Whether auto-purge is enabled.
no setterinherited
isEmpty → bool
Whether there is no key/value pair in the map.
no setterinherited
isNotEmpty → bool
Whether there is at least one key/value pair in the map.
no setterinherited
keys → Iterable<K>
The keys of this Map.
no setterinherited
length → int
The number of key/value pairs in the map.
no setterinherited
onPurgedValues → OnPurgedValues<V>?
Optional callback invoked with values removed during purge.
finalinherited
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
swapped → SwappedDualWeakMap<V, K>
Returns a view with keys and values swapped.
no setterinherited
values → Iterable<V>
The values of this Map.
no setterinherited

Methods

addAll(Map<K, V> other) → void
Adds all key/value pairs of other to this map.
inherited
addEntries(Iterable<MapEntry<K, V>> newEntries) → void
Adds all key/value pairs of newEntries to this map.
inherited
autoPurge() → bool
Runs purge automatically if the threshold is exceeded.
inherited
cast<RK, RV>() → Map<RK, RV>
Provides a view of this map as having RK keys and RV instances, if necessary.
inherited
clear() → void
Removes all entries from the map.
inherited
containsKey(Object? key) → bool
Whether this map contains the given key.
inherited
containsKeyNoPurge(Object? key) → bool
Returns true if key has an associated value.
inherited
containsValue(Object? value) → bool
Whether this map contains the given value.
inherited
containsValueNoPurge(Object? value) → bool
Returns true if any entry currently maps to value.
inherited
forEach(void action(K key, V value)) → void
Applies action to each key/value pair of the map.
inherited
get(Object? key) → V?
Returns the value associated with key, or null if absent or collected.
inherited
getEntry(Object? key) → MapEntry<K, V>?
Returns the MapEntry for key, or null if not found or invalid.
inherited
getKeyFromValue(Object? value) → K?
Returns the key associated with a given value, if still alive.
inherited
getNoPurge(Object? key) → V?
Returns the value associated with key, or null if absent or collected. Same as get, but does NOT purge entries with collected key or value.
inherited
isAutoPurgeRequired() → bool
Returns true if auto-purge should be triggered.
inherited
iterate(void action(K, V)) → void
Iterates over live entries only.
inherited
map<K2, V2>(MapEntry<K2, V2> transform(K key, V value)) → Map<K2, V2>
Returns a new map where all entries of this map are transformed by the given convert function.
inherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
purge() → WeakKeyMap<K, V>
Removes all entries whose keys were garbage-collected.
inherited
put(K key, V value) → void
Inserts or replaces a key-value pair.
inherited
putIfAbsent(K key, V ifAbsent()) → V
Look up the value of key, or add a new entry if it isn't there.
inherited
putValueIfAbsent(K key, V value) → bool
Inserts value for key only if no entry for key already exists.
inherited
remove(Object? key) → V?
Removes key and its associated value, if present, from the map.
inherited
removeWhere(bool test(K key, V value)) → void
Removes all entries of this map that satisfy the given test.
inherited
removeWhereKey(bool test(K key)) → void
inherited
toString() → String
A string representation of this object.
inherited
update(K key, V update(V value), {V ifAbsent()?}) → V
Updates the value for the provided key.
inherited
updateAll(V update(K key, V value)) → void
Updates all values.
inherited

Operators

operator ==(Object other) → bool
The equality operator.
inherited
operator [](Object? key) → V?
The value for the given key, or null if key is not in the map.
inherited
operator []=(K key, V value) → void
Associates the key with the given value.
inherited