| /* |
| * Copyright (C) 2011 The Guava 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 com.google.common.cache; |
| |
| import static com.google.common.cache.CacheTesting.checkEmpty; |
| import static com.google.common.cache.TestingCacheLoaders.constantLoader; |
| import static com.google.common.cache.TestingCacheLoaders.exceptionLoader; |
| import static com.google.common.cache.TestingRemovalListeners.queuingRemovalListener; |
| import static com.google.common.truth.Truth.assertThat; |
| import static java.util.concurrent.TimeUnit.SECONDS; |
| |
| import com.google.common.cache.CacheLoader.InvalidCacheLoadException; |
| import com.google.common.cache.TestingRemovalListeners.QueuingRemovalListener; |
| import com.google.common.util.concurrent.UncheckedExecutionException; |
| import junit.framework.TestCase; |
| |
| /** |
| * {@link LoadingCache} tests for caches with a maximum size of zero. |
| * |
| * @author mike nonemacher |
| */ |
| public class NullCacheTest extends TestCase { |
| QueuingRemovalListener<Object, Object> listener; |
| |
| @Override |
| protected void setUp() { |
| listener = queuingRemovalListener(); |
| } |
| |
| public void testGet() { |
| Object computed = new Object(); |
| LoadingCache<Object, Object> cache = |
| CacheBuilder.newBuilder() |
| .maximumSize(0) |
| .removalListener(listener) |
| .build(constantLoader(computed)); |
| |
| Object key = new Object(); |
| assertSame(computed, cache.getUnchecked(key)); |
| RemovalNotification<Object, Object> notification = listener.remove(); |
| assertSame(key, notification.getKey()); |
| assertSame(computed, notification.getValue()); |
| assertSame(RemovalCause.SIZE, notification.getCause()); |
| assertTrue(listener.isEmpty()); |
| checkEmpty(cache); |
| } |
| |
| public void testGet_expireAfterWrite() { |
| Object computed = new Object(); |
| LoadingCache<Object, Object> cache = |
| CacheBuilder.newBuilder() |
| .expireAfterWrite(0, SECONDS) |
| .removalListener(listener) |
| .build(constantLoader(computed)); |
| |
| Object key = new Object(); |
| assertSame(computed, cache.getUnchecked(key)); |
| RemovalNotification<Object, Object> notification = listener.remove(); |
| assertSame(key, notification.getKey()); |
| assertSame(computed, notification.getValue()); |
| assertSame(RemovalCause.SIZE, notification.getCause()); |
| assertTrue(listener.isEmpty()); |
| checkEmpty(cache); |
| } |
| |
| public void testGet_expireAfterAccess() { |
| Object computed = new Object(); |
| LoadingCache<Object, Object> cache = |
| CacheBuilder.newBuilder() |
| .expireAfterAccess(0, SECONDS) |
| .removalListener(listener) |
| .build(constantLoader(computed)); |
| |
| Object key = new Object(); |
| assertSame(computed, cache.getUnchecked(key)); |
| RemovalNotification<Object, Object> notification = listener.remove(); |
| assertSame(key, notification.getKey()); |
| assertSame(computed, notification.getValue()); |
| assertSame(RemovalCause.SIZE, notification.getCause()); |
| assertTrue(listener.isEmpty()); |
| checkEmpty(cache); |
| } |
| |
| public void testGet_computeNull() { |
| LoadingCache<Object, Object> cache = |
| CacheBuilder.newBuilder() |
| .maximumSize(0) |
| .removalListener(listener) |
| .build(constantLoader(null)); |
| |
| try { |
| cache.getUnchecked(new Object()); |
| fail(); |
| } catch (InvalidCacheLoadException e) { |
| /* expected */ |
| } |
| |
| assertTrue(listener.isEmpty()); |
| checkEmpty(cache); |
| } |
| |
| public void testGet_runtimeException() { |
| final RuntimeException e = new RuntimeException(); |
| LoadingCache<Object, Object> map = |
| CacheBuilder.newBuilder() |
| .maximumSize(0) |
| .removalListener(listener) |
| .build(exceptionLoader(e)); |
| |
| try { |
| map.getUnchecked(new Object()); |
| fail(); |
| } catch (UncheckedExecutionException uee) { |
| assertThat(uee).hasCauseThat().isSameInstanceAs(e); |
| } |
| assertTrue(listener.isEmpty()); |
| checkEmpty(map); |
| } |
| } |