io.vertx.ext.web.impl.LRUCache Maven / Gradle / Ivy
/*
* Copyright 2014 Red Hat, Inc.
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* and Apache License v2.0 which accompanies this distribution.
*
* The Eclipse Public License is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* The Apache License v2.0 is available at
* http://www.opensource.org/licenses/apache2.0.php
*
* You may elect to redistribute this code under either of these licenses.
*/
package io.vertx.ext.web.impl;
import java.util.LinkedHashMap;
import java.util.Map;
/**
* @author Tim Fox
*/
public class LRUCache extends LinkedHashMap {
private final int maxSize;
public LRUCache(int initialCapacity, float loadFactor, int maxSize) {
super(initialCapacity, loadFactor);
this.maxSize = maxSize;
checkSize();
}
public LRUCache(int initialCapacity, int maxSize) {
super(initialCapacity);
this.maxSize = maxSize;
checkSize();
}
public LRUCache(int maxSize) {
this.maxSize = maxSize;
checkSize();
}
public LRUCache(Map m, int maxSize) {
super(m);
this.maxSize = maxSize;
checkSize();
}
public LRUCache(int initialCapacity, float loadFactor, boolean accessOrder, int maxSize) {
super(initialCapacity, loadFactor, accessOrder);
this.maxSize = maxSize;
checkSize();
}
@Override
protected boolean removeEldestEntry(Map.Entry eldest) {
return size() > maxSize;
}
private void checkSize() {
if (maxSize < 1) {
throw new IllegalArgumentException("maxSize must be >= 1");
}
}
}