/** * Copyright 2009-2016 the original author or authors. * * Licensed 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.ibatis.cache; import static org.junit.Assert.assertNotNull; import static org.junit.Assert.assertNull; import static org.junit.Assert.assertTrue; import org.apache.ibatis.cache.decorators.SerializedCache; import org.apache.ibatis.cache.decorators.WeakCache; import org.apache.ibatis.cache.impl.PerpetualCache; import org.junit.Test; public class WeakCacheTest { @Test public void shouldDemonstrateObjectsBeingCollectedAsNeeded() { final int N = 3000000; WeakCache cache = new WeakCache(new PerpetualCache("default")); for (int i = 0; i < N; i++) { cache.putObject(i, i); if (cache.getSize() < i + 1) { //System.out.println("Cache exceeded with " + (i + 1) + " entries."); break; } if ((i + 1) % 100000 == 0) { // Try performing GC. System.gc(); } } assertTrue(cache.getSize() < N); } @Test public void shouldDemonstrateCopiesAreEqual() { Cache cache = new WeakCache(new PerpetualCache("default")); cache = new SerializedCache(cache); for (int i = 0; i < 1000; i++) { cache.putObject(i, i); Object value = cache.getObject(i); assertTrue(value == null || value.equals(i)); } } @Test public void shouldRemoveItemOnDemand() { WeakCache cache = new WeakCache(new PerpetualCache("default")); cache.putObject(0, 0); assertNotNull(cache.getObject(0)); cache.removeObject(0); assertNull(cache.getObject(0)); } @Test public void shouldFlushAllItemsOnDemand() { WeakCache cache = new WeakCache(new PerpetualCache("default")); for (int i = 0; i < 5; i++) { cache.putObject(i, i); } assertNotNull(cache.getObject(0)); assertNotNull(cache.getObject(4)); cache.clear(); assertNull(cache.getObject(0)); assertNull(cache.getObject(4)); } }