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/*
* Copyright 2023 Anton Tananaev (anton@traccar.org)
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.traccar.session.cache;
import java.lang.ref.WeakReference;
import java.util.HashMap;
import java.util.Map;
public class WeakValueMap<K, V> {
private final Map<K, WeakReference<V>> map = new HashMap<>();
public void put(K key, V value) {
map.put(key, new WeakReference<>(value));
}
public V get(K key) {
WeakReference<V> weakReference = map.get(key);
return (weakReference != null) ? weakReference.get() : null;
}
public V remove(K key) {
WeakReference<V> weakReference = map.remove(key);
return (weakReference != null) ? weakReference.get() : null;
}
private void clean() {
map.entrySet().removeIf(entry -> entry.getValue().get() == null);
}
}
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