/**
* 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.camel.util;
import junit.framework.TestCase;
import org.apache.camel.Service;
/**
* @version
*/
public class LRUCacheTest extends TestCase {
private LRUCache<String, Service> cache;
@Override
protected void setUp() throws Exception {
// for testing use sync listener
cache = new LRUCache<String, Service>(10, 10, true, false, false, true);
}
public void testLRUCache() {
MyService service1 = new MyService();
MyService service2 = new MyService();
cache.put("A", service1);
cache.put("B", service2);
assertEquals(2, cache.size());
assertSame(service1, cache.get("A"));
assertSame(service2, cache.get("B"));
}
public void testLRUCacheEviction() throws Exception {
MyService service1 = new MyService();
MyService service2 = new MyService();
MyService service3 = new MyService();
MyService service4 = new MyService();
MyService service5 = new MyService();
MyService service6 = new MyService();
MyService service7 = new MyService();
MyService service8 = new MyService();
MyService service9 = new MyService();
MyService service10 = new MyService();
MyService service11 = new MyService();
MyService service12 = new MyService();
cache.put("A", service1);
assertNull(service1.getStopped());
cache.put("B", service2);
assertNull(service2.getStopped());
cache.put("C", service3);
assertNull(service3.getStopped());
cache.put("D", service4);
assertNull(service4.getStopped());
cache.put("E", service5);
assertNull(service5.getStopped());
cache.put("F", service6);
assertNull(service6.getStopped());
cache.put("G", service7);
assertNull(service7.getStopped());
cache.put("H", service8);
assertNull(service8.getStopped());
cache.put("I", service9);
assertNull(service9.getStopped());
cache.put("J", service10);
assertNull(service10.getStopped());
// we are now full
assertEquals(10, cache.size());
cache.put("K", service11);
assertNull(service11.getStopped());
// the eviction is async so force cleanup
cache.cleanUp();
cache.put("L", service12);
// the eviction is async so force cleanup
cache.cleanUp();
assertEquals(10, cache.size());
}
public void testLRUCacheHitsAndMisses() {
MyService service1 = new MyService();
MyService service2 = new MyService();
cache.put("A", service1);
cache.put("B", service2);
assertEquals(0, cache.getHits());
assertEquals(0, cache.getMisses());
cache.get("A");
assertEquals(1, cache.getHits());
assertEquals(0, cache.getMisses());
cache.get("A");
assertEquals(2, cache.getHits());
assertEquals(0, cache.getMisses());
cache.get("B");
assertEquals(3, cache.getHits());
assertEquals(0, cache.getMisses());
cache.get("C");
assertEquals(3, cache.getHits());
assertEquals(1, cache.getMisses());
cache.get("D");
assertEquals(3, cache.getHits());
assertEquals(2, cache.getMisses());
cache.resetStatistics();
assertEquals(0, cache.getHits());
assertEquals(0, cache.getMisses());
cache.get("B");
assertEquals(1, cache.getHits());
assertEquals(0, cache.getMisses());
cache.clear();
assertEquals(0, cache.getHits());
assertEquals(0, cache.getMisses());
cache.get("B");
assertEquals(0, cache.getHits());
assertEquals(1, cache.getMisses());
}
private static final class MyService implements Service {
private Boolean stopped;
public void start() throws Exception {
}
public void stop() throws Exception {
stopped = true;
}
public Boolean getStopped() {
return stopped;
}
}
}