org.codehaus.groovy.runtime.memoize

Class UnlimitedConcurrentCache<K,V>

java.lang.Object

org.codehaus.groovy.runtime.memoize.UnlimitedConcurrentCache<K,V>

All Implemented Interfaces:

Serializable, Map<K,V>, EvictableCache<K,V>, MemoizeCache<K,V>

@ThreadSafe
public final class UnlimitedConcurrentCache<K,V>
extends Object
implements EvictableCache<K,V>, Serializable

A cache backed by a ConcurrentHashMap

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from interface org.codehaus.groovy.runtime.memoize.EvictableCache

EvictableCache.Action<K,V,R>, EvictableCache.EvictionStrategy

Nested classes/interfaces inherited from interface org.codehaus.groovy.runtime.memoize.MemoizeCache

MemoizeCache.ValueProvider<K,V>

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

Map.Entry<K,V>

Constructor Summary

Constructors

Constructor and Description
UnlimitedConcurrentCache() Constructs a cache with unlimited size
UnlimitedConcurrentCache(int initialCapacity) Constructs a cache with unlimited size and set its initial capacity
UnlimitedConcurrentCache(Map<? extends K,? extends V> m) Constructs a cache and initialize the cache with the specified map

Method Summary

Modifier and Type	Method and Description
void	cleanUpNullReferences() Replying on the ConcurrentHashMap thread-safe iteration implementation the method will remove all entries holding SoftReferences to gc-evicted objects.
Map<K,V>	clearAll() Clear the cache
boolean	containsKey(Object key) Determines if the cache contains an entry for the specified key.
boolean	containsValue(Object value)
Set<Map.Entry<K,V>>	entrySet()
V	get(Object key) Gets a value from the cache
V	getAndPut(K key, MemoizeCache.ValueProvider<? super K,? extends V> valueProvider) Try to get the value from cache.
boolean	isEmpty()
Set<K>	keys() Get all keys associated to cached values
Set<K>	keySet()
V	put(K key, V value) Associates the specified value with the specified key in the cache.
void	putAll(Map<? extends K,? extends V> m)
V	remove(Object key) Remove the cached value by the key
int	size() Get the size of the cache
Collection<V>	values() Get all cached values

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.codehaus.groovy.runtime.memoize.EvictableCache

clear

Methods inherited from interface java.util.Map

compute, computeIfAbsent, computeIfPresent, equals, forEach, getOrDefault, hashCode, merge, putIfAbsent, remove, replace, replace, replaceAll

Constructor Detail

UnlimitedConcurrentCache

public UnlimitedConcurrentCache()

Constructs a cache with unlimited size

UnlimitedConcurrentCache

public UnlimitedConcurrentCache(int initialCapacity)

Constructs a cache with unlimited size and set its initial capacity

Parameters:

initialCapacity - the initial capacity

UnlimitedConcurrentCache

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

Constructs a cache and initialize the cache with the specified map

Parameters:

m - the map to initialize the cache

Method Detail

remove

public V remove(Object key)

Remove the cached value by the key

Specified by:

remove in interface Map<K,V>

Specified by:

remove in interface EvictableCache<K,V>

Parameters:

key -

Returns:

returns the removed value

putAll

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

Specified by:

putAll in interface Map<K,V>

keySet

public Set<K> keySet()

Specified by:

keySet in interface Map<K,V>

clearAll

public Map<K,V> clearAll()

Clear the cache

Specified by:

clearAll in interface EvictableCache<K,V>

Returns:

returns the content of the cleared map

values

public Collection<V> values()

Get all cached values

Specified by:

values in interface Map<K,V>

Specified by:

values in interface EvictableCache<K,V>

Returns:

all cached values

entrySet

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

Specified by:

entrySet in interface Map<K,V>

keys

public Set<K> keys()

Get all keys associated to cached values

Specified by:

keys in interface EvictableCache<K,V>

Returns:

all keys

containsKey

public boolean containsKey(Object key)

Determines if the cache contains an entry for the specified key.

Specified by:

containsKey in interface Map<K,V>

Specified by:

containsKey in interface EvictableCache<K,V>

Parameters:

key - key whose presence in this cache is to be tested.

Returns:

true if the cache contains a mapping for the specified key

containsValue

public boolean containsValue(Object value)

Specified by:

containsValue in interface Map<K,V>

size

public int size()

Get the size of the cache

Specified by:

size in interface Map<K,V>

Specified by:

size in interface EvictableCache<K,V>

Returns:

the size of the cache

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface Map<K,V>

put

public V put(K key,
             V value)

Associates the specified value with the specified key in the cache.

Specified by:

put in interface Map<K,V>

Specified by:

put in interface MemoizeCache<K,V>

Parameters:

key - key with which the specified value is to be associated

value - value to be associated with the specified key

Returns:

null, or the old value if the key associated with the specified key.

get

public V get(Object key)

Gets a value from the cache

Specified by:

get in interface Map<K,V>

Specified by:

get in interface MemoizeCache<K,V>

Parameters:

key - the key whose associated value is to be returned

Returns:

the value, or null, if it does not exist.

getAndPut

public V getAndPut(K key,
                   MemoizeCache.ValueProvider<? super K,? extends V> valueProvider)

Try to get the value from cache. If not found, create the value by MemoizeCache.ValueProvider and put it into the cache, at last return the value.

Specified by:

getAndPut in interface MemoizeCache<K,V>

Parameters:

key -

valueProvider - provide the value if the associated value not found

Returns:

the cached value

cleanUpNullReferences

public void cleanUpNullReferences()

Replying on the ConcurrentHashMap thread-safe iteration implementation the method will remove all entries holding SoftReferences to gc-evicted objects.

Specified by:

cleanUpNullReferences in interface MemoizeCache<K,V>