com.gigaspaces.internal.utils.collections

Class ConcurrentBoundedCache<Key,Value>

java.lang.Object

com.gigaspaces.internal.utils.collections.ConcurrentBoundedCache<Key,Value>

All Implemented Interfaces:

Map<Key,Value>

public class ConcurrentBoundedCache<Key,Value>
extends Object
implements Map<Key,Value>

Concurrent bounded cache. It uses a ConcurrentHashMap and a counter to set the upper bound to the cache size. If one of the threads reaches the upperBound, the cache is cleared.

Since:

10.1.0

Version:

1.0

Author:

Boris

Nested Class Summary

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

Map.Entry<K,V>

Field Summary

Fields

Modifier and Type	Field and Description
protected ConcurrentHashMap<Key,SoftReference<Value>>	_map
protected AtomicInteger	approximateSize
protected static Object	clearLock
protected static boolean	enabled
protected static Object	lazyLock
protected static long	upperBound

Constructor Summary

Constructors

Constructor and Description
ConcurrentBoundedCache() Default constructor.

Method Summary

Modifier and Type	Method and Description
void	clear()
boolean	containsKey(Object key)
boolean	containsValue(Object value)
Set<Map.Entry<Key,Value>>	entrySet()
Value	get(Object key)
boolean	isEmpty()
Set<Key>	keySet()
Value	put(Key key, Value value)
void	putAll(Map<? extends Key,? extends Value> t)
Value	remove(Object key)
int	size()
Collection<Value>	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, forEach, getOrDefault, hashCode, merge, putIfAbsent, remove, replace, replace, replaceAll

Field Detail

_map

protected volatile ConcurrentHashMap<Key,SoftReference<Value>> _map

approximateSize

protected AtomicInteger approximateSize

clearLock

protected static final Object clearLock

lazyLock

protected static final Object lazyLock

upperBound

protected static final long upperBound

enabled

protected static final boolean enabled

Constructor Detail

ConcurrentBoundedCache

public ConcurrentBoundedCache()

Default constructor. Constructs a new empty cache.

Method Detail

put

public Value put(Key key,
                 Value value)

Specified by:

put in interface Map<Key,Value>

get

public Value get(Object key)

Specified by:

get in interface Map<Key,Value>

remove

public Value remove(Object key)

Specified by:

remove in interface Map<Key,Value>

containsKey

public boolean containsKey(Object key)

Specified by:

containsKey in interface Map<Key,Value>

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface Map<Key,Value>

keySet

public Set<Key> keySet()

Specified by:

keySet in interface Map<Key,Value>

size

public int size()

Specified by:

size in interface Map<Key,Value>

clear

public void clear()

Specified by:

clear in interface Map<Key,Value>

containsValue

public boolean containsValue(Object value)

Specified by:

containsValue in interface Map<Key,Value>

entrySet

public Set<Map.Entry<Key,Value>> entrySet()

Specified by:

entrySet in interface Map<Key,Value>

putAll

public void putAll(Map<? extends Key,? extends Value> t)

Specified by:

putAll in interface Map<Key,Value>

values

public Collection<Value> values()

Specified by:

values in interface Map<Key,Value>