132 lines
4.4 KiB
Java
132 lines
4.4 KiB
Java
/*
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* Copyright (C) 2011 The Guava Authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
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* in compliance with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software distributed under the License
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* is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
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* or implied. See the License for the specific language governing permissions and limitations under
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* the License.
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*/
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package com.google.common.cache;
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import static com.google.common.cache.CacheTesting.checkEmpty;
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import static com.google.common.cache.TestingCacheLoaders.constantLoader;
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import static com.google.common.cache.TestingCacheLoaders.exceptionLoader;
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import static com.google.common.cache.TestingRemovalListeners.queuingRemovalListener;
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import static com.google.common.truth.Truth.assertThat;
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import static java.util.concurrent.TimeUnit.SECONDS;
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import com.google.common.cache.CacheLoader.InvalidCacheLoadException;
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import com.google.common.cache.TestingRemovalListeners.QueuingRemovalListener;
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import com.google.common.util.concurrent.UncheckedExecutionException;
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import junit.framework.TestCase;
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/**
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* {@link LoadingCache} tests for caches with a maximum size of zero.
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*
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* @author mike nonemacher
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*/
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public class NullCacheTest extends TestCase {
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QueuingRemovalListener<Object, Object> listener;
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@Override
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protected void setUp() {
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listener = queuingRemovalListener();
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}
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public void testGet() {
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Object computed = new Object();
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LoadingCache<Object, Object> cache =
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CacheBuilder.newBuilder()
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.maximumSize(0)
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.removalListener(listener)
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.build(constantLoader(computed));
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Object key = new Object();
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assertSame(computed, cache.getUnchecked(key));
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RemovalNotification<Object, Object> notification = listener.remove();
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assertSame(key, notification.getKey());
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assertSame(computed, notification.getValue());
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assertSame(RemovalCause.SIZE, notification.getCause());
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assertTrue(listener.isEmpty());
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checkEmpty(cache);
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}
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public void testGet_expireAfterWrite() {
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Object computed = new Object();
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LoadingCache<Object, Object> cache =
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CacheBuilder.newBuilder()
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.expireAfterWrite(0, SECONDS)
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.removalListener(listener)
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.build(constantLoader(computed));
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Object key = new Object();
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assertSame(computed, cache.getUnchecked(key));
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RemovalNotification<Object, Object> notification = listener.remove();
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assertSame(key, notification.getKey());
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assertSame(computed, notification.getValue());
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assertSame(RemovalCause.SIZE, notification.getCause());
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assertTrue(listener.isEmpty());
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checkEmpty(cache);
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}
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public void testGet_expireAfterAccess() {
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Object computed = new Object();
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LoadingCache<Object, Object> cache =
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CacheBuilder.newBuilder()
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.expireAfterAccess(0, SECONDS)
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.removalListener(listener)
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.build(constantLoader(computed));
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Object key = new Object();
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assertSame(computed, cache.getUnchecked(key));
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RemovalNotification<Object, Object> notification = listener.remove();
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assertSame(key, notification.getKey());
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assertSame(computed, notification.getValue());
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assertSame(RemovalCause.SIZE, notification.getCause());
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assertTrue(listener.isEmpty());
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checkEmpty(cache);
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}
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public void testGet_computeNull() {
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LoadingCache<Object, Object> cache =
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CacheBuilder.newBuilder()
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.maximumSize(0)
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.removalListener(listener)
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.build(constantLoader(null));
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try {
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cache.getUnchecked(new Object());
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fail();
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} catch (InvalidCacheLoadException e) {
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/* expected */
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}
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assertTrue(listener.isEmpty());
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checkEmpty(cache);
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}
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public void testGet_runtimeException() {
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final RuntimeException e = new RuntimeException();
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LoadingCache<Object, Object> map =
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CacheBuilder.newBuilder()
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.maximumSize(0)
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.removalListener(listener)
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.build(exceptionLoader(e));
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try {
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map.getUnchecked(new Object());
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fail();
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} catch (UncheckedExecutionException uee) {
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assertThat(uee).hasCauseThat().isSameInstanceAs(e);
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}
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assertTrue(listener.isEmpty());
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checkEmpty(map);
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}
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}
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