WeakReferenceConcurrentHashMap.java

package com.firefly.utils.collection;

import java.lang.ref.Reference;
import java.lang.ref.WeakReference;

public class WeakReferenceConcurrentHashMap<K, V> extends AbstractConcurrentAutomaticClearMap<K, V> {

	private class ValueWeakReference extends WeakReference<V> {

		K key;

		public ValueWeakReference(K key, V value) {
			super(value, refQueue);
			this.key = key;
		}

	}

	@SuppressWarnings("unchecked")
	@Override
	protected void clearInvalidEntry(Reference<? extends V> ref) {
		map.remove(((ValueWeakReference) ref).key);
	}

	@Override
	protected Reference<V> createRefence(K key, V value) {
		return new ValueWeakReference(key, value);
	}

}