public List<? extends V> getCachedObjects() {
LinkedList<V> list = new LinkedList<V>();
for (ObjectRef<K, V> objectRef : state.map.values()) {
V object = objectRef.getObject();
if (objectRef.isValid()) {
list.add(object);
}
}
return list;
}
public V get(Serializable name) {
ObjectRef<K, V> entry = map.get(name);
if (entry != null) {
V o = entry.getObject();
if (entry.isValid()) {
config.hits.incrementAndGet();
config.onGet(entry.name, o);
return o;
} else {
config.misses.incrementAndGet();
if (map.remove(name, entry)) {
queue.remove(entry);
}
config.onExpire(entry.name, o);
}
}
return null;
}
public V remove(Serializable name) {
boolean trace = isTraceEnabled();
ObjectRef<K, V> item = map.remove(name);
if (item != null) {
if (trace) {
trace("Removed item=" + item.serial + " from the map going to remove it");
}
boolean removed = queue.remove(item);
boolean valid = removed && item.isValid();
V object = item.getObject();
if (valid) {
config.onRemove(item.name, object);
return object;
} else {
config.onExpire(item.name, object);
return null;
}
} else {
return null;
}
}
/**
* Do a put with the provided expiration time.
*
* @param expirationTime the expiration time
* @param name the cache key
* @param obj the cached value
*/
void put(long expirationTime, K name, V obj) {
boolean trace = isTraceEnabled();
ObjectRef<K, V> nextRef = new SimpleObjectRef<K, V>(expirationTime, name, obj);
ObjectRef<K, V> previousRef = map.put(name, nextRef);
// Remove previous (promoted as first element)
if (previousRef != null) {
queue.remove(previousRef);
if (trace) {
trace(
"Replaced item=" + previousRef.serial + " with item=" + nextRef.serial + " in the map");
}
} else if (trace) {
trace("Added item=" + nextRef.serial + " to map");
}
// Add to the queue
queue.add(nextRef);
// Perform eviction from queue
ArrayList<ObjectRef<K, V>> evictedRefs = queue.trim(config.maxSize);
if (evictedRefs != null) {
for (ObjectRef<K, V> evictedRef : evictedRefs) {
// We remove it from the map only if it was the same entry
// it could have been removed concurrently by an explicit remove
// or by a promotion
map.remove(evictedRef.name, evictedRef);
// Expiration callback
config.onExpire(evictedRef.name, evictedRef.getObject());
}
}
// Put callback
config.onPut(name, obj);
}