| /* |
| * 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.jackrabbit.oak.commons.cache; |
| |
| import java.util.concurrent.atomic.AtomicInteger; |
| |
| import junit.framework.Assert; |
| import org.apache.jackrabbit.oak.commons.concurrent.Concurrent; |
| import org.junit.Test; |
| |
| /** |
| * Tests the cache implementation. |
| */ |
| public class ConcurrentCacheTest implements Cache.Backend<Integer, ConcurrentCacheTest.Data> { |
| |
| Cache<Integer, Data> cache = Cache.newInstance(this, 5); |
| AtomicInteger counter = new AtomicInteger(); |
| volatile int value; |
| |
| @Test |
| public void test() throws Exception { |
| Concurrent.run("cache", new Concurrent.Task() { |
| @Override |
| public void call() throws Exception { |
| int k = value++ % 10; |
| Data v = cache.get(k); |
| Assert.assertEquals(k, v.value); |
| } |
| }); |
| } |
| |
| @Override |
| public Data load(Integer key) { |
| int start = counter.get(); |
| try { |
| Thread.sleep(1); |
| } catch (InterruptedException e) { |
| // ignore |
| } |
| if (counter.getAndIncrement() != start) { |
| throw new AssertionError("Concurrent load"); |
| } |
| return new Data(key); |
| } |
| |
| static class Data implements Cache.Value { |
| |
| int value; |
| |
| Data(int value) { |
| this.value = value; |
| } |
| |
| @Override |
| public int getMemory() { |
| return 1; |
| } |
| |
| } |
| } |