org.apache.karaf.tooling.utils.SimpleLRUCache Maven / Gradle / Ivy
/**
*
* 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,
* 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.apache.karaf.tooling.utils;
import java.util.LinkedHashMap;
import java.util.Map.Entry;
/**
* A very simplistic LRU cache based on LinkedHashMap. It grows up to the size specified in the constructor,
* evicting least recently accessed entries to keep the size there.
*/
public final class SimpleLRUCache extends LinkedHashMap {
private static final long serialVersionUID = 1L;
private final int maxEntries;
public SimpleLRUCache(int maxEntries) {
this(16, 0.75f, maxEntries);
}
public SimpleLRUCache(int initialSize, float loadFactor, int maxEntries) {
super(initialSize, loadFactor, true);
this.maxEntries = maxEntries;
}
@Override
protected boolean removeEldestEntry(Entry eldest) {
return size() > maxEntries;
}
}