org.infinispan.atomic
Class AtomicMapLookup

java.lang.Object
  org.infinispan.atomic.AtomicMapLookup

public class AtomicMapLookup
extends Object

A helper that locates or safely constructs and registers atomic maps with a given cache. This should be the only way AtomicMaps are created/retrieved, to prevent concurrent creation, registration and possibly overwriting of such a map within the cache.

Since:

4.0

Author:

Manik Surtani

See Also:

AtomicMap

Constructor Summary

AtomicMapLookup()

Method Summary

static <MK,K,V> AtomicMap<K,V>	getAtomicMap(Cache<MK,?> cache, MK key) Retrieves an atomic map from a given cache, stored under a given key.
static <MK,K,V> AtomicMap<K,V>	getAtomicMap(Cache<MK,?> cache, MK key, boolean createIfAbsent) Retrieves an atomic map from a given cache, stored under a given key.
static <MK,K,V> Map<K,V>	getReadOnlyAtomicMap(Cache<MK,?> cache, MK key) Retrieves an atomic map from a given cache, stored under a given key, for reading only.

Methods inherited from class java.lang.Object

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

Constructor Detail

AtomicMapLookup

public AtomicMapLookup()

Method Detail

getAtomicMap

public static <MK,K,V> AtomicMap<K,V> getAtomicMap(Cache<MK,?> cache,
                                                   MK key)

Retrieves an atomic map from a given cache, stored under a given key. If an atomic map did not exist, one is created and registered in an atomic fashion.

Type Parameters:

MK - key param of the cache

K - key param of the AtomicMap

V - value param of the AtomicMap

Parameters:

cache - underlying cache

key - key under which the atomic map exists

Returns:

an AtomicMap

getAtomicMap

public static <MK,K,V> AtomicMap<K,V> getAtomicMap(Cache<MK,?> cache,
                                                   MK key,
                                                   boolean createIfAbsent)

Retrieves an atomic map from a given cache, stored under a given key.

Type Parameters:

MK - key param of the cache

K - key param of the AtomicMap

V - value param of the AtomicMap

Parameters:

cache - underlying cache

key - key under which the atomic map exists

createIfAbsent - if true, a new atomic map is created if one doesn't exist; otherwise null is returned if the map didn't exist.

Returns:

an AtomicMap, or null if one did not exist.

getReadOnlyAtomicMap

public static <MK,K,V> Map<K,V> getReadOnlyAtomicMap(Cache<MK,?> cache,
                                                     MK key)

Retrieves an atomic map from a given cache, stored under a given key, for reading only. The atomic map returned will not support updates, and if the map did not in fact exist, an empty map is returned.

Type Parameters:

MK - key param of the cache

K - key param of the AtomicMap

V - value param of the AtomicMap

Parameters:

cache - underlying cache

key - key under which the atomic map exists

Returns:

an immutable, read-only map