106 lines
3.5 KiB
Java
106 lines
3.5 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");
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* you may not use this file except in compliance with the License.
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* 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
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.common.cache;
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import com.google.common.collect.ImmutableList;
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import com.google.common.collect.ImmutableMap;
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import com.google.common.collect.Queues;
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import com.google.common.util.concurrent.Futures;
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import com.google.common.util.concurrent.ListenableFuture;
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import java.util.Deque;
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import java.util.Map;
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import java.util.concurrent.Executor;
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import java.util.concurrent.Future;
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import java.util.concurrent.atomic.AtomicInteger;
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import junit.framework.TestCase;
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/**
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* Unit tests for {@link CacheLoader}.
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*
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* @author Charles Fry
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*/
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public class CacheLoaderTest extends TestCase {
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private static class QueuingExecutor implements Executor {
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private final Deque<Runnable> tasks = Queues.newArrayDeque();
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@Override
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public void execute(Runnable task) {
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tasks.add(task);
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}
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private void runNext() {
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tasks.removeFirst().run();
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}
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}
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public void testAsyncReload() throws Exception {
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final AtomicInteger loadCount = new AtomicInteger();
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final AtomicInteger reloadCount = new AtomicInteger();
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final AtomicInteger loadAllCount = new AtomicInteger();
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CacheLoader<Object, Object> baseLoader =
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new CacheLoader<Object, Object>() {
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@Override
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public Object load(Object key) {
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loadCount.incrementAndGet();
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return new Object();
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}
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@Override
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public ListenableFuture<Object> reload(Object key, Object oldValue) {
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reloadCount.incrementAndGet();
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return Futures.immediateFuture(new Object());
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}
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@Override
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public Map<Object, Object> loadAll(Iterable<?> keys) {
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loadAllCount.incrementAndGet();
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return ImmutableMap.of();
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}
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};
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assertEquals(0, loadCount.get());
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assertEquals(0, reloadCount.get());
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assertEquals(0, loadAllCount.get());
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baseLoader.load(new Object());
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@SuppressWarnings("unused") // https://errorprone.info/bugpattern/FutureReturnValueIgnored
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Future<?> possiblyIgnoredError = baseLoader.reload(new Object(), new Object());
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baseLoader.loadAll(ImmutableList.of(new Object()));
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assertEquals(1, loadCount.get());
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assertEquals(1, reloadCount.get());
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assertEquals(1, loadAllCount.get());
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QueuingExecutor executor = new QueuingExecutor();
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CacheLoader<Object, Object> asyncReloader = CacheLoader.asyncReloading(baseLoader, executor);
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asyncReloader.load(new Object());
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@SuppressWarnings("unused") // https://errorprone.info/bugpattern/FutureReturnValueIgnored
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Future<?> possiblyIgnoredError1 = asyncReloader.reload(new Object(), new Object());
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asyncReloader.loadAll(ImmutableList.of(new Object()));
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assertEquals(2, loadCount.get());
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assertEquals(1, reloadCount.get());
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assertEquals(2, loadAllCount.get());
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executor.runNext();
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assertEquals(2, loadCount.get());
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assertEquals(2, reloadCount.get());
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assertEquals(2, loadAllCount.get());
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}
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}
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