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package org.infinispan.atomic;
import org.infinispan.AdvancedCache;
import org.infinispan.Cache;
import org.infinispan.atomic.impl.AtomicHashMap;
import org.infinispan.atomic.impl.AtomicHashMapProxy;
import org.infinispan.atomic.impl.FineGrainedAtomicHashMapProxy;
import org.infinispan.context.Flag;
import java.util.Collections;
import java.util.Map;
import static org.infinispan.commons.util.Immutables.immutableMapWrap;
/**
* 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.
*
* @author Manik Surtani
* @see AtomicMap
* @since 4.0
*/
public class AtomicMapLookup {
/**
* 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.
*
* @param cache underlying cache
* @param key key under which the atomic map exists
* @param key param of the cache
* @param key param of the AtomicMap
* @param value param of the AtomicMap
* @return an AtomicMap
*/
public static AtomicMap getAtomicMap(Cache cache, MK key) {
return getAtomicMap(cache, key, true);
}
/**
* Retrieves a fine grained atomic map from a given cache, stored under a given key. If a fine grained atomic map did
* not exist, one is created and registered in an atomic fashion.
*
* @param cache underlying cache
* @param key key under which the atomic map exists
* @param key param of the cache
* @param key param of the AtomicMap
* @param value param of the AtomicMap
* @return an AtomicMap
*/
public static FineGrainedAtomicMap getFineGrainedAtomicMap(Cache cache, MK key) {
return getFineGrainedAtomicMap(cache, key, true);
}
/**
* Retrieves an atomic map from a given cache, stored under a given key.
*
* @param cache underlying cache
* @param key key under which the atomic map exists
* @param createIfAbsent if true, a new atomic map is created if one doesn't exist; otherwise null is returned if the
* map didn't exist.
* @param key param of the cache
* @param key param of the AtomicMap
* @param value param of the AtomicMap
* @return an AtomicMap, or null if one did not exist.
*/
public static AtomicMap getAtomicMap(Cache cache, MK key, boolean createIfAbsent) {
return (AtomicMap) getMap(cache, key, createIfAbsent, false);
}
/**
* Retrieves an atomic map from a given cache, stored under a given key.
*
* @param cache underlying cache
* @param key key under which the atomic map exists
* @param createIfAbsent if true, a new atomic map is created if one doesn't exist; otherwise null is returned if the
* map didn't exist.
* @param key param of the cache
* @param key param of the AtomicMap
* @param value param of the AtomicMap
* @return an AtomicMap, or null if one did not exist.
*/
public static FineGrainedAtomicMap getFineGrainedAtomicMap(Cache cache, MK key, boolean createIfAbsent) {
return (FineGrainedAtomicMap) getMap(cache, key, createIfAbsent, true);
}
/**
* Retrieves an atomic map from a given cache, stored under a given key.
*
*
* @param cache underlying cache
* @param key key under which the atomic map exists
* @param createIfAbsent if true, a new atomic map is created if one doesn't exist; otherwise null is returned if the
* map didn't exist.
* @param fineGrained if true, and createIfAbsent is true then created atomic map will be fine grained.
* @return an AtomicMap, or null if one did not exist.
*/
@SuppressWarnings("unchecked")
private static Map getMap(Cache cache, MK key, boolean createIfAbsent, boolean fineGrained) {
Object value = cache.get(key);
if (value == null) {
if (createIfAbsent)
value = AtomicHashMap.newInstance((Cache) cache, key, fineGrained ? AtomicHashMap.ProxyMode.FINE : AtomicHashMap.ProxyMode.COARSE);
else return null;
}
AtomicHashMap castValue = (AtomicHashMap) value;
AtomicHashMapProxy proxy =
castValue.getProxy((AdvancedCache) cache.getAdvancedCache(), key);
boolean typeSwitchAttempt = proxy instanceof FineGrainedAtomicHashMapProxy != fineGrained;
if (typeSwitchAttempt) {
throw new IllegalArgumentException("Cannot switch type of previously used " + value
+ " from " + (fineGrained ? "regular to fine-grained!" : "fine-grained to regular!"));
}
return proxy;
}
/**
* 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.
*
* @param cache underlying cache
* @param key key under which the atomic map exists
* @param key param of the cache
* @param key param of the AtomicMap
* @param value param of the AtomicMap
* @return an immutable, read-only map
*/
public static Map getReadOnlyAtomicMap(Cache cache, MK key) {
AtomicMap am = getAtomicMap(cache, key, false);
if (am == null)
return Collections.emptyMap();
else
return immutableMapWrap(am);
}
/**
* Removes the atomic map associated with the given key from the underlying cache.
*
* @param cache underlying cache
* @param key key under which the atomic map exists
* @param key param of the cache
*/
public static void removeAtomicMap(Cache cache, MK key) {
cache.getAdvancedCache().withFlags(Flag.IGNORE_RETURN_VALUES).remove(key);
}
}
