K - the type of keys maintained by this mapV - the type of mapped valuespublic final class PrivateMaxEntriesMap<K,V> extends AbstractMap<K,V> implements ConcurrentMap<K,V>, Serializable
ConcurrentHashMap in that it maintains a
page replacement algorithm that is used to evict an entry when the map has
exceeded its capacity. Unlike the Java Collections Framework, this
map does not have a publicly visible constructor and instances are created
through a PrivateMaxEntriesMap.Builder.
An entry is evicted from the map when the entry size exceeds its maximum capacity threshold.
An EvictionListener may be supplied for notification when an entry
is evicted from the map. This listener is invoked on a caller's thread and
will not block other threads from operating on the map. An implementation
should be aware that the caller's thread will not expect long execution
times or failures as a side effect of the listener being notified. Execution
safety and a fast turn around time can be achieved by performing the
operation asynchronously, such as by submitting a task to an
ExecutorService.
The concurrency level determines the number of threads that can concurrently modify the table. Using a significantly higher or lower value than needed can waste space or lead to thread contention, but an estimate within an order of magnitude of the ideal value does not usually have a noticeable impact. Because placement in hash tables is essentially random, the actual concurrency will vary.
This class and its views and iterators implement all of the
optional methods of the Map and Iterator
interfaces.
Like Hashtable but unlike HashMap, this class
does not allow null to be used as a key or value. Unlike
LinkedHashMap, this class does not provide
predictable iteration order. A snapshot of the keys and entries may be
obtained in ascending and descending order of retention.
| Modifier and Type | Class and Description |
|---|---|
static class |
PrivateMaxEntriesMap.Builder<K,V>
A builder that creates
PrivateMaxEntriesMap instances. |
AbstractMap.SimpleEntry<K,V>, AbstractMap.SimpleImmutableEntry<K,V>| Modifier and Type | Method and Description |
|---|---|
long |
capacity()
Retrieves the maximum capacity of the map.
|
void |
clear() |
boolean |
containsKey(Object key) |
boolean |
containsValue(Object value) |
Set<Map.Entry<K,V>> |
entrySet() |
V |
get(Object key) |
boolean |
isEmpty() |
Set<K> |
keySet() |
V |
put(K key,
V value) |
V |
putIfAbsent(K key,
V value) |
V |
remove(Object key) |
boolean |
remove(Object key,
Object value) |
V |
replace(K key,
V value) |
boolean |
replace(K key,
V oldValue,
V newValue) |
void |
setCapacity(long capacity)
Sets the maximum capacity of the map and eagerly evicts entries
until it shrinks to the appropriate size.
|
int |
size() |
Collection<V> |
values() |
finalize, getClass, notify, notifyAll, wait, wait, waitcompute, computeIfAbsent, computeIfPresent, forEach, getOrDefault, merge, replaceAllpublic long capacity()
public void setCapacity(long capacity)
capacity - the maximum capacity of the mapIllegalArgumentException - if the capacity is negativepublic boolean isEmpty()
public int size()
public void clear()
public boolean containsKey(Object key)
containsKey in interface Map<K,V>containsKey in class AbstractMap<K,V>public boolean containsValue(Object value)
containsValue in interface Map<K,V>containsValue in class AbstractMap<K,V>public V putIfAbsent(K key, V value)
putIfAbsent in interface ConcurrentMap<K,V>putIfAbsent in interface Map<K,V>public Collection<V> values()
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