diff options
Diffstat (limited to 'src/main/java/org/traccar/session/cache/WeakValueMap.java')
-rw-r--r-- | src/main/java/org/traccar/session/cache/WeakValueMap.java | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/src/main/java/org/traccar/session/cache/WeakValueMap.java b/src/main/java/org/traccar/session/cache/WeakValueMap.java new file mode 100644 index 000000000..8323e2c30 --- /dev/null +++ b/src/main/java/org/traccar/session/cache/WeakValueMap.java @@ -0,0 +1,44 @@ +/* + * 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); + } + +} |