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// Copyright (C) 2022 The Android Open Source Project
//
// 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.gerrit.server.cache.mem;
import static com.google.common.base.Functions.identity;
import static com.google.common.truth.Truth.assertThat;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.LoadingCache;
import com.google.common.cache.Weigher;
import com.google.common.collect.ImmutableMap;
import com.google.gerrit.server.cache.CacheDef;
import com.google.inject.TypeLiteral;
import java.time.Duration;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.concurrent.BrokenBarrierException;
import java.util.concurrent.CyclicBarrier;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import java.util.function.Function;
import java.util.stream.Collectors;
import java.util.stream.StreamSupport;
import org.eclipse.jgit.lib.Config;
import org.junit.Before;
import org.junit.Test;
public class DefaultMemoryCacheFactoryTest {
private static final String TEST_CACHE = "test-cache";
private static final long TEST_TIMEOUT_SEC = 1;
private static final int TEST_CACHE_KEY = 1;
private DefaultMemoryCacheFactory memoryCacheFactory;
private Config memoryCacheConfig;
private ScheduledExecutorService executor;
private CyclicBarrier cacheGetStarted;
private CyclicBarrier cacheGetCompleted;
@Before
public void setUp() {
memoryCacheConfig = new Config();
memoryCacheFactory = new DefaultMemoryCacheFactory(memoryCacheConfig, null);
executor = Executors.newScheduledThreadPool(1);
cacheGetStarted = new CyclicBarrier(2);
cacheGetCompleted = new CyclicBarrier(2);
}
@Test
public void shouldNotBlockEvictionsWhenCacheIsDisabledByDefault() throws Exception {
LoadingCache<Integer, Integer> disabledCache =
memoryCacheFactory.build(newCacheDef(0), newCacheLoader(identity()));
assertCacheEvictionIsNotBlocking(disabledCache);
}
@Test
public void shouldNotBlockEvictionsWhenCacheIsDisabledByConfiguration() throws Exception {
memoryCacheConfig.setInt("cache", TEST_CACHE, "memoryLimit", 0);
LoadingCache<Integer, Integer> disabledCache =
memoryCacheFactory.build(newCacheDef(1), newCacheLoader(identity()));
assertCacheEvictionIsNotBlocking(disabledCache);
}
@Test
public void shouldBlockEvictionsWhenCacheIsEnabled() throws Exception {
LoadingCache<Integer, Integer> cache =
memoryCacheFactory.build(newCacheDef(1), newCacheLoader(identity()));
ScheduledFuture<Integer> cacheValue =
executor.schedule(() -> cache.getUnchecked(TEST_CACHE_KEY), 0, TimeUnit.SECONDS);
cacheGetStarted.await(TEST_TIMEOUT_SEC, TimeUnit.SECONDS);
cache.invalidate(TEST_CACHE_KEY);
assertThat(cacheValue.isDone()).isTrue();
assertThat(cacheValue.get()).isEqualTo(TEST_CACHE_KEY);
}
@Test
public void shouldLoadAllKeysWithDisabledCache() throws Exception {
LoadingCache<Integer, Integer> disabledCache =
memoryCacheFactory.build(newCacheDef(0), newCacheLoader(identity()));
List<Integer> keys = Arrays.asList(1, 2);
ImmutableMap<Integer, Integer> entries = disabledCache.getAll(keys);
assertThat(entries).containsExactly(1, 1, 2, 2);
}
private void assertCacheEvictionIsNotBlocking(LoadingCache<Integer, Integer> disabledCache)
throws InterruptedException, BrokenBarrierException, TimeoutException, ExecutionException {
ScheduledFuture<Integer> cacheValue =
executor.schedule(() -> disabledCache.getUnchecked(TEST_CACHE_KEY), 0, TimeUnit.SECONDS);
cacheGetStarted.await(TEST_TIMEOUT_SEC, TimeUnit.SECONDS);
disabledCache.invalidate(TEST_CACHE_KEY);
// The invalidate did not wait for the cache loader to finish, therefore the cacheValue isn't
// done yet
assertThat(cacheValue.isDone()).isFalse();
// The cache loader completes after the invalidation
cacheGetCompleted.await(TEST_TIMEOUT_SEC, TimeUnit.SECONDS);
assertThat(cacheValue.get()).isEqualTo(TEST_CACHE_KEY);
}
private CacheLoader<Integer, Integer> newCacheLoader(Function<Integer, Integer> loadFunc) {
return new CacheLoader<>() {
@Override
public Integer load(Integer n) throws Exception {
Integer v = 0;
try {
cacheGetStarted.await(TEST_TIMEOUT_SEC, TimeUnit.SECONDS);
v = loadFunc.apply(n);
cacheGetCompleted.await(TEST_TIMEOUT_SEC, TimeUnit.SECONDS);
} catch (TimeoutException | BrokenBarrierException e) {
// Just continue
}
return v;
}
@Override
public Map<Integer, Integer> loadAll(Iterable<? extends Integer> keys) throws Exception {
return StreamSupport.stream(keys.spliterator(), false)
.collect(Collectors.toMap(identity(), identity()));
}
};
}
private CacheDef<Integer, Integer> newCacheDef(long maximumWeight) {
return new CacheDef<>() {
@Override
public String name() {
return TEST_CACHE;
}
@Override
public String configKey() {
return TEST_CACHE;
}
@Override
public TypeLiteral<Integer> keyType() {
return null;
}
@Override
public TypeLiteral<Integer> valueType() {
return null;
}
@Override
public long maximumWeight() {
return maximumWeight;
}
@Override
public Duration expireAfterWrite() {
return null;
}
@Override
public Duration expireFromMemoryAfterAccess() {
return null;
}
@Override
public Duration refreshAfterWrite() {
return null;
}
@Override
public Weigher<Integer, Integer> weigher() {
return null;
}
@Override
public CacheLoader<Integer, Integer> loader() {
return null;
}
};
}
}
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