1 /* 2 * Copyright (C) 2011 The Guava Authors 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except 5 * in compliance with the License. You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software distributed under the License 10 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express 11 * or implied. See the License for the specific language governing permissions and limitations under 12 * the License. 13 */ 14 15 package com.google.common.cache; 16 17 import static com.google.common.cache.CacheTesting.checkEmpty; 18 import static com.google.common.cache.TestingCacheLoaders.constantLoader; 19 import static com.google.common.cache.TestingCacheLoaders.exceptionLoader; 20 import static com.google.common.cache.TestingRemovalListeners.queuingRemovalListener; 21 import static java.util.concurrent.TimeUnit.SECONDS; 22 23 import com.google.common.cache.CacheLoader.InvalidCacheLoadException; 24 import com.google.common.cache.TestingRemovalListeners.QueuingRemovalListener; 25 import com.google.common.util.concurrent.UncheckedExecutionException; 26 27 import junit.framework.TestCase; 28 29 /** 30 * {@link LoadingCache} tests for caches with a maximum size of zero. 31 * 32 * @author mike nonemacher 33 */ 34 public class NullCacheTest extends TestCase { 35 QueuingRemovalListener<Object, Object> listener; 36 37 @Override setUp()38 protected void setUp() { 39 listener = queuingRemovalListener(); 40 } 41 testGet()42 public void testGet() { 43 Object computed = new Object(); 44 LoadingCache<Object, Object> cache = CacheBuilder.newBuilder() 45 .maximumSize(0) 46 .removalListener(listener) 47 .build(constantLoader(computed)); 48 49 Object key = new Object(); 50 assertSame(computed, cache.getUnchecked(key)); 51 RemovalNotification<Object, Object> notification = listener.remove(); 52 assertSame(key, notification.getKey()); 53 assertSame(computed, notification.getValue()); 54 assertSame(RemovalCause.SIZE, notification.getCause()); 55 assertTrue(listener.isEmpty()); 56 checkEmpty(cache); 57 } 58 testGet_expireAfterWrite()59 public void testGet_expireAfterWrite() { 60 Object computed = new Object(); 61 LoadingCache<Object, Object> cache = CacheBuilder.newBuilder() 62 .expireAfterWrite(0, SECONDS) 63 .removalListener(listener) 64 .build(constantLoader(computed)); 65 66 Object key = new Object(); 67 assertSame(computed, cache.getUnchecked(key)); 68 RemovalNotification<Object, Object> notification = listener.remove(); 69 assertSame(key, notification.getKey()); 70 assertSame(computed, notification.getValue()); 71 assertSame(RemovalCause.SIZE, notification.getCause()); 72 assertTrue(listener.isEmpty()); 73 checkEmpty(cache); 74 } 75 testGet_expireAfterAccess()76 public void testGet_expireAfterAccess() { 77 Object computed = new Object(); 78 LoadingCache<Object, Object> cache = CacheBuilder.newBuilder() 79 .expireAfterAccess(0, SECONDS) 80 .removalListener(listener) 81 .build(constantLoader(computed)); 82 83 Object key = new Object(); 84 assertSame(computed, cache.getUnchecked(key)); 85 RemovalNotification<Object, Object> notification = listener.remove(); 86 assertSame(key, notification.getKey()); 87 assertSame(computed, notification.getValue()); 88 assertSame(RemovalCause.SIZE, notification.getCause()); 89 assertTrue(listener.isEmpty()); 90 checkEmpty(cache); 91 } 92 testGet_computeNull()93 public void testGet_computeNull() { 94 LoadingCache<Object, Object> cache = CacheBuilder.newBuilder() 95 .maximumSize(0) 96 .removalListener(listener) 97 .build(constantLoader(null)); 98 99 try { 100 cache.getUnchecked(new Object()); 101 fail(); 102 } catch (InvalidCacheLoadException e) { /* expected */} 103 104 assertTrue(listener.isEmpty()); 105 checkEmpty(cache); 106 } 107 testGet_runtimeException()108 public void testGet_runtimeException() { 109 final RuntimeException e = new RuntimeException(); 110 LoadingCache<Object, Object> map = CacheBuilder.newBuilder() 111 .maximumSize(0) 112 .removalListener(listener) 113 .build(exceptionLoader(e)); 114 115 try { 116 map.getUnchecked(new Object()); 117 fail(); 118 } catch (UncheckedExecutionException uee) { 119 assertSame(e, uee.getCause()); 120 } 121 assertTrue(listener.isEmpty()); 122 checkEmpty(map); 123 } 124 } 125