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/*
* 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 static org.junit.Assert.assertThrows;
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));
assertThrows(InvalidCacheLoadException.class, () -> cache.getUnchecked(new Object()));
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));
UncheckedExecutionException uee =
assertThrows(UncheckedExecutionException.class, () -> map.getUnchecked(new Object()));
assertThat(uee).hasCauseThat().isSameInstanceAs(e);
assertTrue(listener.isEmpty());
checkEmpty(map);
}
}
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