/*
* 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.tomcat.util.collections;
import org.junit.Assert;
import org.junit.Test;
public class TestConcurrentLruCache {
@Test
public void testLimit() {
ConcurrentLruCache<String> cache = getStartingCache();
cache.add("D");
Assert.assertFalse(cache.contains("A"));
Assert.assertTrue(cache.contains("B"));
Assert.assertTrue(cache.contains("C"));
Assert.assertTrue(cache.contains("D"));
}
@Test
public void testLRU() {
ConcurrentLruCache<String> cache = getStartingCache();
cache.contains("A");
cache.add("D");
Assert.assertTrue(cache.contains("A"));
Assert.assertFalse(cache.contains("B"));
Assert.assertTrue(cache.contains("C"));
Assert.assertTrue(cache.contains("D"));
}
@Test
public void testIncreaseLimit() {
ConcurrentLruCache<String> cache = getStartingCache();
cache.setLimit(4);
cache.add("D");
Assert.assertTrue(cache.contains("A"));
Assert.assertTrue(cache.contains("B"));
Assert.assertTrue(cache.contains("C"));
Assert.assertTrue(cache.contains("D"));
cache.add("E");
Assert.assertFalse(cache.contains("A"));
Assert.assertTrue(cache.contains("B"));
Assert.assertTrue(cache.contains("C"));
Assert.assertTrue(cache.contains("D"));
Assert.assertTrue(cache.contains("E"));
}
@Test
public void testReduceLimit() {
ConcurrentLruCache<String> cache = getStartingCache();
cache.contains("A");
cache.setLimit(2);
Assert.assertTrue(cache.contains("A"));
Assert.assertFalse(cache.contains("B"));
Assert.assertTrue(cache.contains("C"));
}
private ConcurrentLruCache<String> getStartingCache() {
ConcurrentLruCache<String> cache = new ConcurrentLruCache<>(3);
cache.add("A");
cache.add("B");
cache.add("C");
return cache;
}
}