| /* |
| * 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.kafka.common.cache; |
| |
| import org.junit.Test; |
| |
| import static org.junit.Assert.assertEquals; |
| import static org.junit.Assert.assertNull; |
| |
| public class LRUCacheTest { |
| |
| @Test |
| public void testPutGet() { |
| Cache<String, String> cache = new LRUCache<>(4); |
| |
| cache.put("a", "b"); |
| cache.put("c", "d"); |
| cache.put("e", "f"); |
| cache.put("g", "h"); |
| |
| assertEquals(4, cache.size()); |
| |
| assertEquals("b", cache.get("a")); |
| assertEquals("d", cache.get("c")); |
| assertEquals("f", cache.get("e")); |
| assertEquals("h", cache.get("g")); |
| } |
| |
| @Test |
| public void testRemove() { |
| Cache<String, String> cache = new LRUCache<>(4); |
| |
| cache.put("a", "b"); |
| cache.put("c", "d"); |
| cache.put("e", "f"); |
| assertEquals(3, cache.size()); |
| |
| assertEquals(true, cache.remove("a")); |
| assertEquals(2, cache.size()); |
| assertNull(cache.get("a")); |
| assertEquals("d", cache.get("c")); |
| assertEquals("f", cache.get("e")); |
| |
| assertEquals(false, cache.remove("key-does-not-exist")); |
| |
| assertEquals(true, cache.remove("c")); |
| assertEquals(1, cache.size()); |
| assertNull(cache.get("c")); |
| assertEquals("f", cache.get("e")); |
| |
| assertEquals(true, cache.remove("e")); |
| assertEquals(0, cache.size()); |
| assertNull(cache.get("e")); |
| } |
| |
| @Test |
| public void testEviction() { |
| Cache<String, String> cache = new LRUCache<>(2); |
| |
| cache.put("a", "b"); |
| cache.put("c", "d"); |
| assertEquals(2, cache.size()); |
| |
| cache.put("e", "f"); |
| assertEquals(2, cache.size()); |
| assertNull(cache.get("a")); |
| assertEquals("d", cache.get("c")); |
| assertEquals("f", cache.get("e")); |
| |
| // Validate correct access order eviction |
| cache.get("c"); |
| cache.put("g", "h"); |
| assertEquals(2, cache.size()); |
| assertNull(cache.get("e")); |
| assertEquals("d", cache.get("c")); |
| assertEquals("h", cache.get("g")); |
| } |
| } |