public class LazyInitializedCacheMap<K,V>
extends java.lang.Object
implements java.util.Map<K,V>
IoBuffer
for example.
Based on the final implementation of Memoizer written by Brian Goetz and Tim
Peierls. This implementation will return an
UnsupportedOperationException
on each method that is not intended to
be called by user code for performance reasons.Modifier and Type | Class and Description |
---|---|
class |
LazyInitializedCacheMap.NoopInitializer
This class provides a noop
LazyInitializer meaning it
will return the same object it received when instantiated. |
Constructor and Description |
---|
LazyInitializedCacheMap()
Default constructor.
|
LazyInitializedCacheMap(java.util.concurrent.ConcurrentHashMap<K,LazyInitializer<V>> map)
This constructor allows to provide a fine tuned
ConcurrentHashMap
to stick with each special case the user needs. |
Modifier and Type | Method and Description |
---|---|
void |
clear() |
boolean |
containsKey(java.lang.Object key) |
boolean |
containsValue(java.lang.Object value) |
java.util.Set<java.util.Map.Entry<K,V>> |
entrySet() |
V |
get(java.lang.Object key) |
java.util.Collection<LazyInitializer<V>> |
getValues() |
boolean |
isEmpty() |
java.util.Set<K> |
keySet() |
V |
put(K key,
V value) |
void |
putAll(java.util.Map<? extends K,? extends V> m) |
V |
putIfAbsent(K key,
LazyInitializer<V> value)
If the specified key is not already associated
with a value, associate it with the given value.
|
V |
remove(java.lang.Object key) |
int |
size() |
java.util.Collection<V> |
values() |
public LazyInitializedCacheMap()
ConcurrentHashMap
.public LazyInitializedCacheMap(java.util.concurrent.ConcurrentHashMap<K,LazyInitializer<V>> map)
ConcurrentHashMap
to stick with each special case the user needs.public V putIfAbsent(K key, LazyInitializer<V> value)
if (!map.containsKey(key)) return map.put(key, value); else return map.get(key);except that the action is performed atomically.
key
- key with which the specified value is to be associatedvalue
- a lazy initialized value object.public boolean containsValue(java.lang.Object value)
public java.util.Collection<V> values()
public java.util.Collection<LazyInitializer<V>> getValues()
public boolean containsKey(java.lang.Object key)
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