org.apache.flink.runtime.util.LRUCache Maven / Gradle / Ivy
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* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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,
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* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.flink.runtime.util;
import java.util.ArrayDeque;
import java.util.Deque;
public class LRUCache {
private final Deque lruCache = new ArrayDeque();
public static LRUCache create() {
return new LRUCache();
}
public void add(V value) {
lruCache.addLast(value);
}
public V getLRU() {
V lru = lruCache.pollFirst();
if (lru != null) {
add(lru);
}
return lru;
}
public V removeLRU() {
return lruCache.pollFirst();
}
public boolean isEmpty() {
return lruCache.isEmpty();
}
public int size() {
return lruCache.size();
}
}