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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 com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Queues;
import com.google.common.util.concurrent.Futures;
import com.google.common.util.concurrent.ListenableFuture;
import java.util.Deque;
import java.util.Map;
import java.util.concurrent.Executor;
import java.util.concurrent.Future;
import java.util.concurrent.atomic.AtomicInteger;
import junit.framework.TestCase;
/**
* Unit tests for {@link CacheLoader}.
*
* @author Charles Fry
*/
public class CacheLoaderTest extends TestCase {
private static class QueuingExecutor implements Executor {
private final Deque<Runnable> tasks = Queues.newArrayDeque();
@Override
public void execute(Runnable task) {
tasks.add(task);
}
private void runNext() {
tasks.removeFirst().run();
}
}
public void testAsyncReload() throws Exception {
final AtomicInteger loadCount = new AtomicInteger();
final AtomicInteger reloadCount = new AtomicInteger();
final AtomicInteger loadAllCount = new AtomicInteger();
CacheLoader<Object, Object> baseLoader =
new CacheLoader<Object, Object>() {
@Override
public Object load(Object key) {
loadCount.incrementAndGet();
return new Object();
}
@Override
public ListenableFuture<Object> reload(Object key, Object oldValue) {
reloadCount.incrementAndGet();
return Futures.immediateFuture(new Object());
}
@Override
public Map<Object, Object> loadAll(Iterable<?> keys) {
loadAllCount.incrementAndGet();
return ImmutableMap.of();
}
};
assertEquals(0, loadCount.get());
assertEquals(0, reloadCount.get());
assertEquals(0, loadAllCount.get());
baseLoader.load(new Object());
@SuppressWarnings("unused") // https://errorprone.info/bugpattern/FutureReturnValueIgnored
Future<?> possiblyIgnoredError = baseLoader.reload(new Object(), new Object());
baseLoader.loadAll(ImmutableList.of(new Object()));
assertEquals(1, loadCount.get());
assertEquals(1, reloadCount.get());
assertEquals(1, loadAllCount.get());
QueuingExecutor executor = new QueuingExecutor();
CacheLoader<Object, Object> asyncReloader = CacheLoader.asyncReloading(baseLoader, executor);
asyncReloader.load(new Object());
@SuppressWarnings("unused") // https://errorprone.info/bugpattern/FutureReturnValueIgnored
Future<?> possiblyIgnoredError1 = asyncReloader.reload(new Object(), new Object());
asyncReloader.loadAll(ImmutableList.of(new Object()));
assertEquals(2, loadCount.get());
assertEquals(1, reloadCount.get());
assertEquals(2, loadAllCount.get());
executor.runNext();
assertEquals(2, loadCount.get());
assertEquals(2, reloadCount.get());
assertEquals(2, loadAllCount.get());
}
}
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