Java example source code file (CacheLoadingTest.java)
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The CacheLoadingTest.java Java example source code
/*
* 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.TestingCacheLoaders.bulkLoader;
import static com.google.common.cache.TestingCacheLoaders.constantLoader;
import static com.google.common.cache.TestingCacheLoaders.errorLoader;
import static com.google.common.cache.TestingCacheLoaders.exceptionLoader;
import static com.google.common.cache.TestingCacheLoaders.identityLoader;
import static com.google.common.cache.TestingRemovalListeners.countingRemovalListener;
import static com.google.common.truth.Truth.assertThat;
import static java.lang.Thread.currentThread;
import static java.util.Arrays.asList;
import static java.util.concurrent.TimeUnit.MILLISECONDS;
import com.google.common.cache.CacheLoader.InvalidCacheLoadException;
import com.google.common.cache.TestingCacheLoaders.CountingLoader;
import com.google.common.cache.TestingCacheLoaders.IdentityLoader;
import com.google.common.cache.TestingRemovalListeners.CountingRemovalListener;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
import com.google.common.testing.FakeTicker;
import com.google.common.testing.TestLogHandler;
import com.google.common.util.concurrent.Callables;
import com.google.common.util.concurrent.ExecutionError;
import com.google.common.util.concurrent.Futures;
import com.google.common.util.concurrent.ListenableFuture;
import com.google.common.util.concurrent.UncheckedExecutionException;
import junit.framework.TestCase;
import java.io.IOException;
import java.lang.ref.WeakReference;
import java.util.List;
import java.util.Map;
import java.util.concurrent.Callable;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicReferenceArray;
import java.util.logging.LogRecord;
/**
* Tests relating to cache loading: concurrent loading, exceptions during loading, etc.
*
* @author mike nonemacher
*/
public class CacheLoadingTest extends TestCase {
TestLogHandler logHandler;
@Override
public void setUp() throws Exception {
super.setUp();
logHandler = new TestLogHandler();
LocalCache.logger.addHandler(logHandler);
}
@Override
public void tearDown() throws Exception {
super.tearDown();
// TODO(cpovirk): run tests in other thread instead of messing with main thread interrupt status
currentThread().interrupted();
LocalCache.logger.removeHandler(logHandler);
}
private Throwable popLoggedThrowable() {
List<LogRecord> logRecords = logHandler.getStoredLogRecords();
assertEquals(1, logRecords.size());
LogRecord logRecord = logRecords.get(0);
logHandler.clear();
return logRecord.getThrown();
}
private void checkNothingLogged() {
assertTrue(logHandler.getStoredLogRecords().isEmpty());
}
private void checkLoggedCause(Throwable t) {
assertSame(t, popLoggedThrowable().getCause());
}
private void checkLoggedInvalidLoad() {
assertThat(popLoggedThrowable()).isInstanceOf(InvalidCacheLoadException.class);
}
public void testLoad() throws ExecutionException {
LoadingCache<Object, Object> cache = CacheBuilder.newBuilder()
.recordStats()
.build(identityLoader());
CacheStats stats = cache.stats();
assertEquals(0, stats.missCount());
assertEquals(0, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
Object key = new Object();
assertSame(key, cache.get(key));
stats = cache.stats();
assertEquals(1, stats.missCount());
assertEquals(1, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
key = new Object();
assertSame(key, cache.getUnchecked(key));
stats = cache.stats();
assertEquals(2, stats.missCount());
assertEquals(2, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
key = new Object();
cache.refresh(key);
checkNothingLogged();
stats = cache.stats();
assertEquals(2, stats.missCount());
assertEquals(3, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
assertSame(key, cache.get(key));
stats = cache.stats();
assertEquals(2, stats.missCount());
assertEquals(3, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(1, stats.hitCount());
Object value = new Object();
// callable is not called
assertSame(key, cache.get(key, throwing(new Exception())));
stats = cache.stats();
assertEquals(2, stats.missCount());
assertEquals(3, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(2, stats.hitCount());
key = new Object();
assertSame(value, cache.get(key, Callables.returning(value)));
stats = cache.stats();
assertEquals(3, stats.missCount());
assertEquals(4, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(2, stats.hitCount());
}
public void testReload() throws ExecutionException {
final Object one = new Object();
final Object two = new Object();
CacheLoader<Object, Object> loader = new CacheLoader() {
@Override
public Object load(Object key) {
return one;
}
@Override
public ListenableFuture<Object> reload(Object key, Object oldValue) {
return Futures.immediateFuture(two);
}
};
LoadingCache<Object, Object> cache = CacheBuilder.newBuilder().recordStats().build(loader);
Object key = new Object();
CacheStats stats = cache.stats();
assertEquals(0, stats.missCount());
assertEquals(0, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
assertSame(one, cache.getUnchecked(key));
stats = cache.stats();
assertEquals(1, stats.missCount());
assertEquals(1, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
cache.refresh(key);
checkNothingLogged();
stats = cache.stats();
assertEquals(1, stats.missCount());
assertEquals(2, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
assertSame(two, cache.getUnchecked(key));
stats = cache.stats();
assertEquals(1, stats.missCount());
assertEquals(2, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(1, stats.hitCount());
}
public void testRefresh() {
final Object one = new Object();
final Object two = new Object();
FakeTicker ticker = new FakeTicker();
CacheLoader<Object, Object> loader = new CacheLoader() {
@Override
public Object load(Object key) {
return one;
}
@Override
public ListenableFuture<Object> reload(Object key, Object oldValue) {
return Futures.immediateFuture(two);
}
};
LoadingCache<Object, Object> cache = CacheBuilder.newBuilder()
.recordStats()
.ticker(ticker)
.refreshAfterWrite(1, MILLISECONDS)
.build(loader);
Object key = new Object();
CacheStats stats = cache.stats();
assertEquals(0, stats.missCount());
assertEquals(0, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
assertSame(one, cache.getUnchecked(key));
stats = cache.stats();
assertEquals(1, stats.missCount());
assertEquals(1, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
ticker.advance(1, MILLISECONDS);
assertSame(one, cache.getUnchecked(key));
stats = cache.stats();
assertEquals(1, stats.missCount());
assertEquals(1, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(1, stats.hitCount());
ticker.advance(1, MILLISECONDS);
assertSame(two, cache.getUnchecked(key));
stats = cache.stats();
assertEquals(1, stats.missCount());
assertEquals(2, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(2, stats.hitCount());
ticker.advance(1, MILLISECONDS);
assertSame(two, cache.getUnchecked(key));
stats = cache.stats();
assertEquals(1, stats.missCount());
assertEquals(2, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(3, stats.hitCount());
}
public void testRefresh_getIfPresent() {
final Object one = new Object();
final Object two = new Object();
FakeTicker ticker = new FakeTicker();
CacheLoader<Object, Object> loader = new CacheLoader() {
@Override
public Object load(Object key) {
return one;
}
@Override
public ListenableFuture<Object> reload(Object key, Object oldValue) {
return Futures.immediateFuture(two);
}
};
LoadingCache<Object, Object> cache = CacheBuilder.newBuilder()
.recordStats()
.ticker(ticker)
.refreshAfterWrite(1, MILLISECONDS)
.build(loader);
Object key = new Object();
CacheStats stats = cache.stats();
assertEquals(0, stats.missCount());
assertEquals(0, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
assertSame(one, cache.getUnchecked(key));
stats = cache.stats();
assertEquals(1, stats.missCount());
assertEquals(1, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
ticker.advance(1, MILLISECONDS);
assertSame(one, cache.getIfPresent(key));
stats = cache.stats();
assertEquals(1, stats.missCount());
assertEquals(1, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(1, stats.hitCount());
ticker.advance(1, MILLISECONDS);
assertSame(two, cache.getIfPresent(key));
stats = cache.stats();
assertEquals(1, stats.missCount());
assertEquals(2, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(2, stats.hitCount());
ticker.advance(1, MILLISECONDS);
assertSame(two, cache.getIfPresent(key));
stats = cache.stats();
assertEquals(1, stats.missCount());
assertEquals(2, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(3, stats.hitCount());
}
public void testBulkLoad_default() throws ExecutionException {
LoadingCache<Integer, Integer> cache = CacheBuilder.newBuilder()
.recordStats()
.build(TestingCacheLoaders.<Integer>identityLoader());
CacheStats stats = cache.stats();
assertEquals(0, stats.missCount());
assertEquals(0, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
assertEquals(ImmutableMap.of(), cache.getAll(ImmutableList.<Integer>of()));
assertEquals(0, stats.missCount());
assertEquals(0, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
assertEquals(ImmutableMap.of(1, 1), cache.getAll(asList(1)));
stats = cache.stats();
assertEquals(1, stats.missCount());
assertEquals(1, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
assertEquals(ImmutableMap.of(1, 1, 2, 2, 3, 3, 4, 4), cache.getAll(asList(1, 2, 3, 4)));
stats = cache.stats();
assertEquals(4, stats.missCount());
assertEquals(4, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(1, stats.hitCount());
assertEquals(ImmutableMap.of(2, 2, 3, 3), cache.getAll(asList(2, 3)));
stats = cache.stats();
assertEquals(4, stats.missCount());
assertEquals(4, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(3, stats.hitCount());
// duplicate keys are ignored, and don't impact stats
assertEquals(ImmutableMap.of(4, 4, 5, 5), cache.getAll(asList(4, 5)));
stats = cache.stats();
assertEquals(5, stats.missCount());
assertEquals(5, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(4, stats.hitCount());
}
public void testBulkLoad_loadAll() throws ExecutionException {
IdentityLoader<Integer> backingLoader = identityLoader();
CacheLoader<Integer, Integer> loader = bulkLoader(backingLoader);
LoadingCache<Integer, Integer> cache = CacheBuilder.newBuilder().recordStats().build(loader);
CacheStats stats = cache.stats();
assertEquals(0, stats.missCount());
assertEquals(0, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
assertEquals(ImmutableMap.of(), cache.getAll(ImmutableList.<Integer>of()));
assertEquals(0, stats.missCount());
assertEquals(0, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
assertEquals(ImmutableMap.of(1, 1), cache.getAll(asList(1)));
stats = cache.stats();
assertEquals(1, stats.missCount());
assertEquals(1, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
assertEquals(ImmutableMap.of(1, 1, 2, 2, 3, 3, 4, 4), cache.getAll(asList(1, 2, 3, 4)));
stats = cache.stats();
assertEquals(4, stats.missCount());
assertEquals(2, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(1, stats.hitCount());
assertEquals(ImmutableMap.of(2, 2, 3, 3), cache.getAll(asList(2, 3)));
stats = cache.stats();
assertEquals(4, stats.missCount());
assertEquals(2, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(3, stats.hitCount());
// duplicate keys are ignored, and don't impact stats
assertEquals(ImmutableMap.of(4, 4, 5, 5), cache.getAll(asList(4, 5)));
stats = cache.stats();
assertEquals(5, stats.missCount());
assertEquals(3, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(4, stats.hitCount());
}
public void testBulkLoad_extra() throws ExecutionException {
CacheLoader<Object, Object> loader = new CacheLoader() {
@Override
public Object load(Object key) throws Exception {
return new Object();
}
@Override
public Map<Object, Object> loadAll(Iterable keys) throws Exception {
Map<Object, Object> result = Maps.newHashMap();
for (Object key : keys) {
Object value = new Object();
result.put(key, value);
// add extra entries
result.put(value, key);
}
return result;
}
};
LoadingCache<Object, Object> cache = CacheBuilder.newBuilder().build(loader);
Object[] lookupKeys = new Object[] { new Object(), new Object(), new Object() };
Map<Object, Object> result = cache.getAll(asList(lookupKeys));
assertThat(result.keySet()).containsExactlyElementsIn(asList(lookupKeys));
for (Map.Entry<Object, Object> entry : result.entrySet()) {
Object key = entry.getKey();
Object value = entry.getValue();
assertSame(value, result.get(key));
assertNull(result.get(value));
assertSame(value, cache.asMap().get(key));
assertSame(key, cache.asMap().get(value));
}
}
public void testBulkLoad_clobber() throws ExecutionException {
final Object extraKey = new Object();
final Object extraValue = new Object();
CacheLoader<Object, Object> loader = new CacheLoader() {
@Override
public Object load(Object key) throws Exception {
throw new AssertionError();
}
@Override
public Map<Object, Object> loadAll(Iterable keys) throws Exception {
Map<Object, Object> result = Maps.newHashMap();
for (Object key : keys) {
Object value = new Object();
result.put(key, value);
}
result.put(extraKey, extraValue);
return result;
}
};
LoadingCache<Object, Object> cache = CacheBuilder.newBuilder().build(loader);
cache.asMap().put(extraKey, extraKey);
assertSame(extraKey, cache.asMap().get(extraKey));
Object[] lookupKeys = new Object[] { new Object(), new Object(), new Object() };
Map<Object, Object> result = cache.getAll(asList(lookupKeys));
assertThat(result.keySet()).containsExactlyElementsIn(asList(lookupKeys));
for (Map.Entry<Object, Object> entry : result.entrySet()) {
Object key = entry.getKey();
Object value = entry.getValue();
assertSame(value, result.get(key));
assertSame(value, cache.asMap().get(key));
}
assertNull(result.get(extraKey));
assertSame(extraValue, cache.asMap().get(extraKey));
}
public void testBulkLoad_clobberNullValue() throws ExecutionException {
final Object extraKey = new Object();
final Object extraValue = new Object();
CacheLoader<Object, Object> loader = new CacheLoader() {
@Override
public Object load(Object key) throws Exception {
throw new AssertionError();
}
@Override
public Map<Object, Object> loadAll(Iterable keys) throws Exception {
Map<Object, Object> result = Maps.newHashMap();
for (Object key : keys) {
Object value = new Object();
result.put(key, value);
}
result.put(extraKey, extraValue);
result.put(extraValue, null);
return result;
}
};
LoadingCache<Object, Object> cache = CacheBuilder.newBuilder().build(loader);
cache.asMap().put(extraKey, extraKey);
assertSame(extraKey, cache.asMap().get(extraKey));
Object[] lookupKeys = new Object[] { new Object(), new Object(), new Object() };
try {
cache.getAll(asList(lookupKeys));
fail();
} catch (InvalidCacheLoadException expected) {}
for (Object key : lookupKeys) {
assertTrue(cache.asMap().containsKey(key));
}
assertSame(extraValue, cache.asMap().get(extraKey));
assertFalse(cache.asMap().containsKey(extraValue));
}
public void testBulkLoad_clobberNullKey() throws ExecutionException {
final Object extraKey = new Object();
final Object extraValue = new Object();
CacheLoader<Object, Object> loader = new CacheLoader() {
@Override
public Object load(Object key) throws Exception {
throw new AssertionError();
}
@Override
public Map<Object, Object> loadAll(Iterable keys) throws Exception {
Map<Object, Object> result = Maps.newHashMap();
for (Object key : keys) {
Object value = new Object();
result.put(key, value);
}
result.put(extraKey, extraValue);
result.put(null, extraKey);
return result;
}
};
LoadingCache<Object, Object> cache = CacheBuilder.newBuilder().build(loader);
cache.asMap().put(extraKey, extraKey);
assertSame(extraKey, cache.asMap().get(extraKey));
Object[] lookupKeys = new Object[] { new Object(), new Object(), new Object() };
try {
cache.getAll(asList(lookupKeys));
fail();
} catch (InvalidCacheLoadException expected) {}
for (Object key : lookupKeys) {
assertTrue(cache.asMap().containsKey(key));
}
assertSame(extraValue, cache.asMap().get(extraKey));
assertFalse(cache.asMap().containsValue(extraKey));
}
public void testBulkLoad_partial() throws ExecutionException {
final Object extraKey = new Object();
final Object extraValue = new Object();
CacheLoader<Object, Object> loader = new CacheLoader() {
@Override
public Object load(Object key) throws Exception {
throw new AssertionError();
}
@Override
public Map<Object, Object> loadAll(Iterable keys) throws Exception {
Map<Object, Object> result = Maps.newHashMap();
// ignore request keys
result.put(extraKey, extraValue);
return result;
}
};
LoadingCache<Object, Object> cache = CacheBuilder.newBuilder().build(loader);
Object[] lookupKeys = new Object[] { new Object(), new Object(), new Object() };
try {
cache.getAll(asList(lookupKeys));
fail();
} catch (InvalidCacheLoadException expected) {}
assertSame(extraValue, cache.asMap().get(extraKey));
}
public void testLoadNull() throws ExecutionException {
LoadingCache<Object, Object> cache = CacheBuilder.newBuilder()
.recordStats()
.build(constantLoader(null));
CacheStats stats = cache.stats();
assertEquals(0, stats.missCount());
assertEquals(0, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
try {
cache.get(new Object());
fail();
} catch (InvalidCacheLoadException expected) {}
stats = cache.stats();
assertEquals(1, stats.missCount());
assertEquals(0, stats.loadSuccessCount());
assertEquals(1, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
try {
cache.getUnchecked(new Object());
fail();
} catch (InvalidCacheLoadException expected) {}
stats = cache.stats();
assertEquals(2, stats.missCount());
assertEquals(0, stats.loadSuccessCount());
assertEquals(2, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
cache.refresh(new Object());
checkLoggedInvalidLoad();
stats = cache.stats();
assertEquals(2, stats.missCount());
assertEquals(0, stats.loadSuccessCount());
assertEquals(3, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
try {
cache.get(new Object(), Callables.returning(null));
fail();
} catch (InvalidCacheLoadException expected) {}
stats = cache.stats();
assertEquals(3, stats.missCount());
assertEquals(0, stats.loadSuccessCount());
assertEquals(4, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
try {
cache.getAll(asList(new Object()));
fail();
} catch (InvalidCacheLoadException expected) {}
stats = cache.stats();
assertEquals(4, stats.missCount());
assertEquals(0, stats.loadSuccessCount());
assertEquals(5, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
}
public void testReloadNull() throws ExecutionException {
final Object one = new Object();
CacheLoader<Object, Object> loader = new CacheLoader() {
@Override
public Object load(Object key) {
return one;
}
@Override
public ListenableFuture<Object> reload(Object key, Object oldValue) {
return null;
}
};
LoadingCache<Object, Object> cache = CacheBuilder.newBuilder().recordStats().build(loader);
Object key = new Object();
CacheStats stats = cache.stats();
assertEquals(0, stats.missCount());
assertEquals(0, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
assertSame(one, cache.getUnchecked(key));
stats = cache.stats();
assertEquals(1, stats.missCount());
assertEquals(1, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
cache.refresh(key);
checkLoggedInvalidLoad();
stats = cache.stats();
assertEquals(1, stats.missCount());
assertEquals(1, stats.loadSuccessCount());
assertEquals(1, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
assertSame(one, cache.getUnchecked(key));
stats = cache.stats();
assertEquals(1, stats.missCount());
assertEquals(1, stats.loadSuccessCount());
assertEquals(1, stats.loadExceptionCount());
assertEquals(1, stats.hitCount());
}
public void testReloadNullFuture() throws ExecutionException {
final Object one = new Object();
CacheLoader<Object, Object> loader = new CacheLoader() {
@Override
public Object load(Object key) {
return one;
}
@Override
public ListenableFuture<Object> reload(Object key, Object oldValue) {
return Futures.immediateFuture(null);
}
};
LoadingCache<Object, Object> cache = CacheBuilder.newBuilder().recordStats().build(loader);
Object key = new Object();
CacheStats stats = cache.stats();
assertEquals(0, stats.missCount());
assertEquals(0, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
assertSame(one, cache.getUnchecked(key));
stats = cache.stats();
assertEquals(1, stats.missCount());
assertEquals(1, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
cache.refresh(key);
checkLoggedInvalidLoad();
stats = cache.stats();
assertEquals(1, stats.missCount());
assertEquals(1, stats.loadSuccessCount());
assertEquals(1, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
assertSame(one, cache.getUnchecked(key));
stats = cache.stats();
assertEquals(1, stats.missCount());
assertEquals(1, stats.loadSuccessCount());
assertEquals(1, stats.loadExceptionCount());
assertEquals(1, stats.hitCount());
}
public void testRefreshNull() {
final Object one = new Object();
FakeTicker ticker = new FakeTicker();
CacheLoader<Object, Object> loader = new CacheLoader() {
@Override
public Object load(Object key) {
return one;
}
@Override
public ListenableFuture<Object> reload(Object key, Object oldValue) {
return Futures.immediateFuture(null);
}
};
LoadingCache<Object, Object> cache = CacheBuilder.newBuilder()
.recordStats()
.ticker(ticker)
.refreshAfterWrite(1, MILLISECONDS)
.build(loader);
Object key = new Object();
CacheStats stats = cache.stats();
assertEquals(0, stats.missCount());
assertEquals(0, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
assertSame(one, cache.getUnchecked(key));
stats = cache.stats();
assertEquals(1, stats.missCount());
assertEquals(1, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
ticker.advance(1, MILLISECONDS);
assertSame(one, cache.getUnchecked(key));
stats = cache.stats();
assertEquals(1, stats.missCount());
assertEquals(1, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(1, stats.hitCount());
ticker.advance(1, MILLISECONDS);
assertSame(one, cache.getUnchecked(key));
// refreshed
stats = cache.stats();
assertEquals(1, stats.missCount());
assertEquals(1, stats.loadSuccessCount());
assertEquals(1, stats.loadExceptionCount());
assertEquals(2, stats.hitCount());
ticker.advance(1, MILLISECONDS);
assertSame(one, cache.getUnchecked(key));
stats = cache.stats();
assertEquals(1, stats.missCount());
assertEquals(1, stats.loadSuccessCount());
assertEquals(2, stats.loadExceptionCount());
assertEquals(3, stats.hitCount());
}
public void testBulkLoadNull() throws ExecutionException {
LoadingCache<Object, Object> cache = CacheBuilder.newBuilder()
.recordStats()
.build(bulkLoader(constantLoader(null)));
CacheStats stats = cache.stats();
assertEquals(0, stats.missCount());
assertEquals(0, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
try {
cache.getAll(asList(new Object()));
fail();
} catch (InvalidCacheLoadException expected) {}
stats = cache.stats();
assertEquals(1, stats.missCount());
assertEquals(0, stats.loadSuccessCount());
assertEquals(1, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
}
public void testBulkLoadNullMap() throws ExecutionException {
LoadingCache<Object, Object> cache = CacheBuilder.newBuilder()
.recordStats()
.build(new CacheLoader<Object, Object>() {
@Override
public Object load(Object key) {
throw new AssertionError();
}
@Override
public Map<Object, Object> loadAll(Iterable keys) {
return null;
}
});
CacheStats stats = cache.stats();
assertEquals(0, stats.missCount());
assertEquals(0, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
try {
cache.getAll(asList(new Object()));
fail();
} catch (InvalidCacheLoadException expected) {}
stats = cache.stats();
assertEquals(1, stats.missCount());
assertEquals(0, stats.loadSuccessCount());
assertEquals(1, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
}
public void testLoadError() throws ExecutionException {
Error e = new Error();
CacheLoader<Object, Object> loader = errorLoader(e);
LoadingCache<Object, Object> cache = CacheBuilder.newBuilder().recordStats().build(loader);
CacheStats stats = cache.stats();
assertEquals(0, stats.missCount());
assertEquals(0, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
try {
cache.get(new Object());
fail();
} catch (ExecutionError expected) {
assertSame(e, expected.getCause());
}
stats = cache.stats();
assertEquals(1, stats.missCount());
assertEquals(0, stats.loadSuccessCount());
assertEquals(1, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
try {
cache.getUnchecked(new Object());
fail();
} catch (ExecutionError expected) {
assertSame(e, expected.getCause());
}
stats = cache.stats();
assertEquals(2, stats.missCount());
assertEquals(0, stats.loadSuccessCount());
assertEquals(2, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
cache.refresh(new Object());
checkLoggedCause(e);
stats = cache.stats();
assertEquals(2, stats.missCount());
assertEquals(0, stats.loadSuccessCount());
assertEquals(3, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
final Error callableError = new Error();
try {
cache.get(new Object(), new Callable<Object>() {
@Override
public Object call() {
throw callableError;
}
});
fail();
} catch (ExecutionError expected) {
assertSame(callableError, expected.getCause());
}
stats = cache.stats();
assertEquals(3, stats.missCount());
assertEquals(0, stats.loadSuccessCount());
assertEquals(4, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
try {
cache.getAll(asList(new Object()));
fail();
} catch (ExecutionError expected) {
assertSame(e, expected.getCause());
}
stats = cache.stats();
assertEquals(4, stats.missCount());
assertEquals(0, stats.loadSuccessCount());
assertEquals(5, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
}
public void testReloadError() throws ExecutionException {
final Object one = new Object();
final Error e = new Error();
CacheLoader<Object, Object> loader = new CacheLoader() {
@Override
public Object load(Object key) {
return one;
}
@Override
public ListenableFuture<Object> reload(Object key, Object oldValue) {
throw e;
}
};
LoadingCache<Object, Object> cache = CacheBuilder.newBuilder().recordStats().build(loader);
Object key = new Object();
CacheStats stats = cache.stats();
assertEquals(0, stats.missCount());
assertEquals(0, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
assertSame(one, cache.getUnchecked(key));
stats = cache.stats();
assertEquals(1, stats.missCount());
assertEquals(1, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
cache.refresh(key);
checkLoggedCause(e);
stats = cache.stats();
assertEquals(1, stats.missCount());
assertEquals(1, stats.loadSuccessCount());
assertEquals(1, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
assertSame(one, cache.getUnchecked(key));
stats = cache.stats();
assertEquals(1, stats.missCount());
assertEquals(1, stats.loadSuccessCount());
assertEquals(1, stats.loadExceptionCount());
assertEquals(1, stats.hitCount());
}
public void testReloadFutureError() throws ExecutionException {
final Object one = new Object();
final Error e = new Error();
CacheLoader<Object, Object> loader = new CacheLoader() {
@Override
public Object load(Object key) {
return one;
}
@Override
public ListenableFuture<Object> reload(Object key, Object oldValue) {
return Futures.immediateFailedFuture(e);
}
};
LoadingCache<Object, Object> cache = CacheBuilder.newBuilder().recordStats().build(loader);
Object key = new Object();
CacheStats stats = cache.stats();
assertEquals(0, stats.missCount());
assertEquals(0, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
assertSame(one, cache.getUnchecked(key));
stats = cache.stats();
assertEquals(1, stats.missCount());
assertEquals(1, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
cache.refresh(key);
checkLoggedCause(e);
stats = cache.stats();
assertEquals(1, stats.missCount());
assertEquals(1, stats.loadSuccessCount());
assertEquals(1, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
assertSame(one, cache.getUnchecked(key));
stats = cache.stats();
assertEquals(1, stats.missCount());
assertEquals(1, stats.loadSuccessCount());
assertEquals(1, stats.loadExceptionCount());
assertEquals(1, stats.hitCount());
}
public void testRefreshError() {
final Object one = new Object();
final Error e = new Error();
FakeTicker ticker = new FakeTicker();
CacheLoader<Object, Object> loader = new CacheLoader() {
@Override
public Object load(Object key) {
return one;
}
@Override
public ListenableFuture<Object> reload(Object key, Object oldValue) {
return Futures.immediateFailedFuture(e);
}
};
LoadingCache<Object, Object> cache = CacheBuilder.newBuilder()
.recordStats()
.ticker(ticker)
.refreshAfterWrite(1, MILLISECONDS)
.build(loader);
Object key = new Object();
CacheStats stats = cache.stats();
assertEquals(0, stats.missCount());
assertEquals(0, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
assertSame(one, cache.getUnchecked(key));
stats = cache.stats();
assertEquals(1, stats.missCount());
assertEquals(1, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
ticker.advance(1, MILLISECONDS);
assertSame(one, cache.getUnchecked(key));
stats = cache.stats();
assertEquals(1, stats.missCount());
assertEquals(1, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(1, stats.hitCount());
ticker.advance(1, MILLISECONDS);
assertSame(one, cache.getUnchecked(key));
// refreshed
stats = cache.stats();
assertEquals(1, stats.missCount());
assertEquals(1, stats.loadSuccessCount());
assertEquals(1, stats.loadExceptionCount());
assertEquals(2, stats.hitCount());
ticker.advance(1, MILLISECONDS);
assertSame(one, cache.getUnchecked(key));
stats = cache.stats();
assertEquals(1, stats.missCount());
assertEquals(1, stats.loadSuccessCount());
assertEquals(2, stats.loadExceptionCount());
assertEquals(3, stats.hitCount());
}
public void testBulkLoadError() throws ExecutionException {
Error e = new Error();
CacheLoader<Object, Object> loader = errorLoader(e);
LoadingCache<Object, Object> cache = CacheBuilder.newBuilder()
.recordStats()
.build(bulkLoader(loader));
CacheStats stats = cache.stats();
assertEquals(0, stats.missCount());
assertEquals(0, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
try {
cache.getAll(asList(new Object()));
fail();
} catch (ExecutionError expected) {
assertSame(e, expected.getCause());
}
stats = cache.stats();
assertEquals(1, stats.missCount());
assertEquals(0, stats.loadSuccessCount());
assertEquals(1, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
}
public void testLoadCheckedException() {
Exception e = new Exception();
CacheLoader<Object, Object> loader = exceptionLoader(e);
LoadingCache<Object, Object> cache = CacheBuilder.newBuilder().recordStats().build(loader);
CacheStats stats = cache.stats();
assertEquals(0, stats.missCount());
assertEquals(0, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
try {
cache.get(new Object());
fail();
} catch (ExecutionException expected) {
assertSame(e, expected.getCause());
}
stats = cache.stats();
assertEquals(1, stats.missCount());
assertEquals(0, stats.loadSuccessCount());
assertEquals(1, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
try {
cache.getUnchecked(new Object());
fail();
} catch (UncheckedExecutionException expected) {
assertSame(e, expected.getCause());
}
stats = cache.stats();
assertEquals(2, stats.missCount());
assertEquals(0, stats.loadSuccessCount());
assertEquals(2, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
cache.refresh(new Object());
checkLoggedCause(e);
stats = cache.stats();
assertEquals(2, stats.missCount());
assertEquals(0, stats.loadSuccessCount());
assertEquals(3, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
Exception callableException = new Exception();
try {
cache.get(new Object(), throwing(callableException));
fail();
} catch (ExecutionException expected) {
assertSame(callableException, expected.getCause());
}
stats = cache.stats();
assertEquals(3, stats.missCount());
assertEquals(0, stats.loadSuccessCount());
assertEquals(4, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
try {
cache.getAll(asList(new Object()));
fail();
} catch (ExecutionException expected) {
assertSame(e, expected.getCause());
}
stats = cache.stats();
assertEquals(4, stats.missCount());
assertEquals(0, stats.loadSuccessCount());
assertEquals(5, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
}
public void testLoadInterruptedException() {
Exception e = new InterruptedException();
CacheLoader<Object, Object> loader = exceptionLoader(e);
LoadingCache<Object, Object> cache = CacheBuilder.newBuilder().recordStats().build(loader);
CacheStats stats = cache.stats();
assertEquals(0, stats.missCount());
assertEquals(0, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
// Sanity check:
assertFalse(currentThread().interrupted());
try {
cache.get(new Object());
fail();
} catch (ExecutionException expected) {
assertSame(e, expected.getCause());
}
assertTrue(currentThread().interrupted());
stats = cache.stats();
assertEquals(1, stats.missCount());
assertEquals(0, stats.loadSuccessCount());
assertEquals(1, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
try {
cache.getUnchecked(new Object());
fail();
} catch (UncheckedExecutionException expected) {
assertSame(e, expected.getCause());
}
assertTrue(currentThread().interrupted());
stats = cache.stats();
assertEquals(2, stats.missCount());
assertEquals(0, stats.loadSuccessCount());
assertEquals(2, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
cache.refresh(new Object());
assertTrue(currentThread().interrupted());
checkLoggedCause(e);
stats = cache.stats();
assertEquals(2, stats.missCount());
assertEquals(0, stats.loadSuccessCount());
assertEquals(3, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
Exception callableException = new InterruptedException();
try {
cache.get(new Object(), throwing(callableException));
fail();
} catch (ExecutionException expected) {
assertSame(callableException, expected.getCause());
}
assertTrue(currentThread().interrupted());
stats = cache.stats();
assertEquals(3, stats.missCount());
assertEquals(0, stats.loadSuccessCount());
assertEquals(4, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
try {
cache.getAll(asList(new Object()));
fail();
} catch (ExecutionException expected) {
assertSame(e, expected.getCause());
}
assertTrue(currentThread().interrupted());
stats = cache.stats();
assertEquals(4, stats.missCount());
assertEquals(0, stats.loadSuccessCount());
assertEquals(5, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
}
public void testReloadCheckedException() {
final Object one = new Object();
final Exception e = new Exception();
CacheLoader<Object, Object> loader = new CacheLoader() {
@Override
public Object load(Object key) {
return one;
}
@Override
public ListenableFuture<Object> reload(Object key, Object oldValue) throws Exception {
throw e;
}
};
LoadingCache<Object, Object> cache = CacheBuilder.newBuilder().recordStats().build(loader);
Object key = new Object();
CacheStats stats = cache.stats();
assertEquals(0, stats.missCount());
assertEquals(0, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
assertSame(one, cache.getUnchecked(key));
stats = cache.stats();
assertEquals(1, stats.missCount());
assertEquals(1, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
cache.refresh(key);
checkLoggedCause(e);
stats = cache.stats();
assertEquals(1, stats.missCount());
assertEquals(1, stats.loadSuccessCount());
assertEquals(1, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
assertSame(one, cache.getUnchecked(key));
stats = cache.stats();
assertEquals(1, stats.missCount());
assertEquals(1, stats.loadSuccessCount());
assertEquals(1, stats.loadExceptionCount());
assertEquals(1, stats.hitCount());
}
public void testReloadFutureCheckedException() {
final Object one = new Object();
final Exception e = new Exception();
CacheLoader<Object, Object> loader = new CacheLoader() {
@Override
public Object load(Object key) {
return one;
}
@Override
public ListenableFuture<Object> reload(Object key, Object oldValue) {
return Futures.immediateFailedFuture(e);
}
};
LoadingCache<Object, Object> cache = CacheBuilder.newBuilder().recordStats().build(loader);
Object key = new Object();
CacheStats stats = cache.stats();
assertEquals(0, stats.missCount());
assertEquals(0, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
assertSame(one, cache.getUnchecked(key));
stats = cache.stats();
assertEquals(1, stats.missCount());
assertEquals(1, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
cache.refresh(key);
checkLoggedCause(e);
stats = cache.stats();
assertEquals(1, stats.missCount());
assertEquals(1, stats.loadSuccessCount());
assertEquals(1, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
assertSame(one, cache.getUnchecked(key));
stats = cache.stats();
assertEquals(1, stats.missCount());
assertEquals(1, stats.loadSuccessCount());
assertEquals(1, stats.loadExceptionCount());
assertEquals(1, stats.hitCount());
}
public void testRefreshCheckedException() {
final Object one = new Object();
final Exception e = new Exception();
FakeTicker ticker = new FakeTicker();
CacheLoader<Object, Object> loader = new CacheLoader() {
@Override
public Object load(Object key) {
return one;
}
@Override
public ListenableFuture<Object> reload(Object key, Object oldValue) {
return Futures.immediateFailedFuture(e);
}
};
LoadingCache<Object, Object> cache = CacheBuilder.newBuilder()
.recordStats()
.ticker(ticker)
.refreshAfterWrite(1, MILLISECONDS)
.build(loader);
Object key = new Object();
CacheStats stats = cache.stats();
assertEquals(0, stats.missCount());
assertEquals(0, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
assertSame(one, cache.getUnchecked(key));
stats = cache.stats();
assertEquals(1, stats.missCount());
assertEquals(1, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
ticker.advance(1, MILLISECONDS);
assertSame(one, cache.getUnchecked(key));
stats = cache.stats();
assertEquals(1, stats.missCount());
assertEquals(1, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(1, stats.hitCount());
ticker.advance(1, MILLISECONDS);
assertSame(one, cache.getUnchecked(key));
// refreshed
stats = cache.stats();
assertEquals(1, stats.missCount());
assertEquals(1, stats.loadSuccessCount());
assertEquals(1, stats.loadExceptionCount());
assertEquals(2, stats.hitCount());
ticker.advance(1, MILLISECONDS);
assertSame(one, cache.getUnchecked(key));
stats = cache.stats();
assertEquals(1, stats.missCount());
assertEquals(1, stats.loadSuccessCount());
assertEquals(2, stats.loadExceptionCount());
assertEquals(3, stats.hitCount());
}
public void testBulkLoadCheckedException() {
Exception e = new Exception();
CacheLoader<Object, Object> loader = exceptionLoader(e);
LoadingCache<Object, Object> cache = CacheBuilder.newBuilder()
.recordStats()
.build(bulkLoader(loader));
CacheStats stats = cache.stats();
assertEquals(0, stats.missCount());
assertEquals(0, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
try {
cache.getAll(asList(new Object()));
fail();
} catch (ExecutionException expected) {
assertSame(e, expected.getCause());
}
stats = cache.stats();
assertEquals(1, stats.missCount());
assertEquals(0, stats.loadSuccessCount());
assertEquals(1, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
}
public void testBulkLoadInterruptedException() {
Exception e = new InterruptedException();
CacheLoader<Object, Object> loader = exceptionLoader(e);
LoadingCache<Object, Object> cache = CacheBuilder.newBuilder()
.recordStats()
.build(bulkLoader(loader));
CacheStats stats = cache.stats();
assertEquals(0, stats.missCount());
assertEquals(0, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
try {
cache.getAll(asList(new Object()));
fail();
} catch (ExecutionException expected) {
assertSame(e, expected.getCause());
}
assertTrue(currentThread().interrupted());
stats = cache.stats();
assertEquals(1, stats.missCount());
assertEquals(0, stats.loadSuccessCount());
assertEquals(1, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
}
public void testLoadUncheckedException() throws ExecutionException {
Exception e = new RuntimeException();
CacheLoader<Object, Object> loader = exceptionLoader(e);
LoadingCache<Object, Object> cache = CacheBuilder.newBuilder().recordStats().build(loader);
CacheStats stats = cache.stats();
assertEquals(0, stats.missCount());
assertEquals(0, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
try {
cache.get(new Object());
fail();
} catch (UncheckedExecutionException expected) {
assertSame(e, expected.getCause());
}
stats = cache.stats();
assertEquals(1, stats.missCount());
assertEquals(0, stats.loadSuccessCount());
assertEquals(1, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
try {
cache.getUnchecked(new Object());
fail();
} catch (UncheckedExecutionException expected) {
assertSame(e, expected.getCause());
}
stats = cache.stats();
assertEquals(2, stats.missCount());
assertEquals(0, stats.loadSuccessCount());
assertEquals(2, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
cache.refresh(new Object());
checkLoggedCause(e);
stats = cache.stats();
assertEquals(2, stats.missCount());
assertEquals(0, stats.loadSuccessCount());
assertEquals(3, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
Exception callableException = new RuntimeException();
try {
cache.get(new Object(), throwing(callableException));
fail();
} catch (UncheckedExecutionException expected) {
assertSame(callableException, expected.getCause());
}
stats = cache.stats();
assertEquals(3, stats.missCount());
assertEquals(0, stats.loadSuccessCount());
assertEquals(4, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
try {
cache.getAll(asList(new Object()));
fail();
} catch (UncheckedExecutionException expected) {
assertSame(e, expected.getCause());
}
stats = cache.stats();
assertEquals(4, stats.missCount());
assertEquals(0, stats.loadSuccessCount());
assertEquals(5, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
}
public void testReloadUncheckedException() throws ExecutionException {
final Object one = new Object();
final Exception e = new RuntimeException();
CacheLoader<Object, Object> loader = new CacheLoader() {
@Override
public Object load(Object key) {
return one;
}
@Override
public ListenableFuture<Object> reload(Object key, Object oldValue) throws Exception {
throw e;
}
};
LoadingCache<Object, Object> cache = CacheBuilder.newBuilder().recordStats().build(loader);
Object key = new Object();
CacheStats stats = cache.stats();
assertEquals(0, stats.missCount());
assertEquals(0, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
assertSame(one, cache.getUnchecked(key));
stats = cache.stats();
assertEquals(1, stats.missCount());
assertEquals(1, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
cache.refresh(key);
checkLoggedCause(e);
stats = cache.stats();
assertEquals(1, stats.missCount());
assertEquals(1, stats.loadSuccessCount());
assertEquals(1, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
assertSame(one, cache.getUnchecked(key));
stats = cache.stats();
assertEquals(1, stats.missCount());
assertEquals(1, stats.loadSuccessCount());
assertEquals(1, stats.loadExceptionCount());
assertEquals(1, stats.hitCount());
}
public void testReloadFutureUncheckedException() throws ExecutionException {
final Object one = new Object();
final Exception e = new RuntimeException();
CacheLoader<Object, Object> loader = new CacheLoader() {
@Override
public Object load(Object key) {
return one;
}
@Override
public ListenableFuture<Object> reload(Object key, Object oldValue) {
return Futures.immediateFailedFuture(e);
}
};
LoadingCache<Object, Object> cache = CacheBuilder.newBuilder().recordStats().build(loader);
Object key = new Object();
CacheStats stats = cache.stats();
assertEquals(0, stats.missCount());
assertEquals(0, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
assertSame(one, cache.getUnchecked(key));
stats = cache.stats();
assertEquals(1, stats.missCount());
assertEquals(1, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
cache.refresh(key);
checkLoggedCause(e);
stats = cache.stats();
assertEquals(1, stats.missCount());
assertEquals(1, stats.loadSuccessCount());
assertEquals(1, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
assertSame(one, cache.getUnchecked(key));
stats = cache.stats();
assertEquals(1, stats.missCount());
assertEquals(1, stats.loadSuccessCount());
assertEquals(1, stats.loadExceptionCount());
assertEquals(1, stats.hitCount());
}
public void testRefreshUncheckedException() {
final Object one = new Object();
final Exception e = new RuntimeException();
FakeTicker ticker = new FakeTicker();
CacheLoader<Object, Object> loader = new CacheLoader() {
@Override
public Object load(Object key) {
return one;
}
@Override
public ListenableFuture<Object> reload(Object key, Object oldValue) {
return Futures.immediateFailedFuture(e);
}
};
LoadingCache<Object, Object> cache = CacheBuilder.newBuilder()
.recordStats()
.ticker(ticker)
.refreshAfterWrite(1, MILLISECONDS)
.build(loader);
Object key = new Object();
CacheStats stats = cache.stats();
assertEquals(0, stats.missCount());
assertEquals(0, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
assertSame(one, cache.getUnchecked(key));
stats = cache.stats();
assertEquals(1, stats.missCount());
assertEquals(1, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
ticker.advance(1, MILLISECONDS);
assertSame(one, cache.getUnchecked(key));
stats = cache.stats();
assertEquals(1, stats.missCount());
assertEquals(1, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(1, stats.hitCount());
ticker.advance(1, MILLISECONDS);
assertSame(one, cache.getUnchecked(key));
// refreshed
stats = cache.stats();
assertEquals(1, stats.missCount());
assertEquals(1, stats.loadSuccessCount());
assertEquals(1, stats.loadExceptionCount());
assertEquals(2, stats.hitCount());
ticker.advance(1, MILLISECONDS);
assertSame(one, cache.getUnchecked(key));
stats = cache.stats();
assertEquals(1, stats.missCount());
assertEquals(1, stats.loadSuccessCount());
assertEquals(2, stats.loadExceptionCount());
assertEquals(3, stats.hitCount());
}
public void testBulkLoadUncheckedException() throws ExecutionException {
Exception e = new RuntimeException();
CacheLoader<Object, Object> loader = exceptionLoader(e);
LoadingCache<Object, Object> cache = CacheBuilder.newBuilder()
.recordStats()
.build(bulkLoader(loader));
CacheStats stats = cache.stats();
assertEquals(0, stats.missCount());
assertEquals(0, stats.loadSuccessCount());
assertEquals(0, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
try {
cache.getAll(asList(new Object()));
fail();
} catch (UncheckedExecutionException expected) {
assertSame(e, expected.getCause());
}
stats = cache.stats();
assertEquals(1, stats.missCount());
assertEquals(0, stats.loadSuccessCount());
assertEquals(1, stats.loadExceptionCount());
assertEquals(0, stats.hitCount());
}
public void testReloadAfterFailure() throws ExecutionException {
final AtomicInteger count = new AtomicInteger();
final Exception e = new IllegalStateException("exception to trigger failure on first load()");
CacheLoader<Integer, String> failOnceFunction = new CacheLoader() {
@Override
public String load(Integer key) throws Exception {
if (count.getAndIncrement() == 0) {
throw e;
}
return key.toString();
}
};
CountingRemovalListener<Integer, String> removalListener = countingRemovalListener();
LoadingCache<Integer, String> cache = CacheBuilder.newBuilder()
.removalListener(removalListener)
.build(failOnceFunction);
try {
cache.getUnchecked(1);
fail();
} catch (UncheckedExecutionException ue) {
assertSame(e, ue.getCause());
}
assertEquals("1", cache.getUnchecked(1));
assertEquals(0, removalListener.getCount());
count.set(0);
cache.refresh(2);
checkLoggedCause(e);
assertEquals("2", cache.getUnchecked(2));
assertEquals(0, removalListener.getCount());
}
public void testReloadAfterValueReclamation() throws InterruptedException, ExecutionException {
CountingLoader countingLoader = new CountingLoader();
LoadingCache<Object, Object> cache =
CacheBuilder.newBuilder().weakValues().build(countingLoader);
ConcurrentMap<Object, Object> map = cache.asMap();
int iterations = 10;
WeakReference<Object> ref = new WeakReference(null);
int expectedComputations = 0;
for (int i = 0; i < iterations; i++) {
// The entry should get garbage collected and recomputed.
Object oldValue = ref.get();
if (oldValue == null) {
expectedComputations++;
}
ref = new WeakReference<Object>(cache.getUnchecked(1));
oldValue = null;
Thread.sleep(i);
System.gc();
}
assertEquals(expectedComputations, countingLoader.getCount());
for (int i = 0; i < iterations; i++) {
// The entry should get garbage collected and recomputed.
Object oldValue = ref.get();
if (oldValue == null) {
expectedComputations++;
}
cache.refresh(1);
checkNothingLogged();
ref = new WeakReference<Object>(map.get(1));
oldValue = null;
Thread.sleep(i);
System.gc();
}
assertEquals(expectedComputations, countingLoader.getCount());
}
public void testReloadAfterSimulatedValueReclamation() throws ExecutionException {
CountingLoader countingLoader = new CountingLoader();
LoadingCache<Object, Object> cache = CacheBuilder.newBuilder()
.concurrencyLevel(1)
.weakValues()
.build(countingLoader);
Object key = new Object();
assertNotNull(cache.getUnchecked(key));
CacheTesting.simulateValueReclamation(cache, key);
// this blocks if computation can't deal with partially-collected values
assertNotNull(cache.getUnchecked(key));
assertEquals(1, cache.size());
assertEquals(2, countingLoader.getCount());
CacheTesting.simulateValueReclamation(cache, key);
cache.refresh(key);
checkNothingLogged();
assertEquals(1, cache.size());
assertEquals(3, countingLoader.getCount());
}
public void testReloadAfterSimulatedKeyReclamation() throws ExecutionException {
CountingLoader countingLoader = new CountingLoader();
LoadingCache<Object, Object> cache = CacheBuilder.newBuilder()
.concurrencyLevel(1)
.weakKeys()
.build(countingLoader);
Object key = new Object();
assertNotNull(cache.getUnchecked(key));
assertEquals(1, cache.size());
CacheTesting.simulateKeyReclamation(cache, key);
// this blocks if computation can't deal with partially-collected values
assertNotNull(cache.getUnchecked(key));
assertEquals(2, countingLoader.getCount());
CacheTesting.simulateKeyReclamation(cache, key);
cache.refresh(key);
checkNothingLogged();
assertEquals(3, countingLoader.getCount());
}
/**
* Make sure LoadingCache correctly wraps ExecutionExceptions and UncheckedExecutionExceptions.
*/
public void testLoadingExceptionWithCause() {
final Exception cause = new Exception();
final UncheckedExecutionException uee = new UncheckedExecutionException(cause);
final ExecutionException ee = new ExecutionException(cause);
LoadingCache<Object, Object> cacheUnchecked =
CacheBuilder.newBuilder().build(exceptionLoader(uee));
LoadingCache<Object, Object> cacheChecked =
CacheBuilder.newBuilder().build(exceptionLoader(ee));
try {
cacheUnchecked.get(new Object());
fail();
} catch (ExecutionException e) {
fail();
} catch (UncheckedExecutionException caughtEe) {
assertSame(uee, caughtEe.getCause());
}
try {
cacheUnchecked.getUnchecked(new Object());
fail();
} catch (UncheckedExecutionException caughtUee) {
assertSame(uee, caughtUee.getCause());
}
cacheUnchecked.refresh(new Object());
checkLoggedCause(uee);
try {
cacheUnchecked.getAll(asList(new Object()));
fail();
} catch (ExecutionException e) {
fail();
} catch (UncheckedExecutionException caughtEe) {
assertSame(uee, caughtEe.getCause());
}
try {
cacheChecked.get(new Object());
fail();
} catch (ExecutionException caughtEe) {
assertSame(ee, caughtEe.getCause());
}
try {
cacheChecked.getUnchecked(new Object());
fail();
} catch (UncheckedExecutionException caughtUee) {
assertSame(ee, caughtUee.getCause());
}
cacheChecked.refresh(new Object());
checkLoggedCause(ee);
try {
cacheChecked.getAll(asList(new Object()));
fail();
} catch (ExecutionException caughtEe) {
assertSame(ee, caughtEe.getCause());
}
}
public void testBulkLoadingExceptionWithCause() {
final Exception cause = new Exception();
final UncheckedExecutionException uee = new UncheckedExecutionException(cause);
final ExecutionException ee = new ExecutionException(cause);
LoadingCache<Object, Object> cacheUnchecked =
CacheBuilder.newBuilder().build(bulkLoader(exceptionLoader(uee)));
LoadingCache<Object, Object> cacheChecked =
CacheBuilder.newBuilder().build(bulkLoader(exceptionLoader(ee)));
try {
cacheUnchecked.getAll(asList(new Object()));
fail();
} catch (ExecutionException e) {
fail();
} catch (UncheckedExecutionException caughtEe) {
assertSame(uee, caughtEe.getCause());
}
try {
cacheChecked.getAll(asList(new Object()));
fail();
} catch (ExecutionException caughtEe) {
assertSame(ee, caughtEe.getCause());
}
}
public void testConcurrentLoading() throws InterruptedException {
testConcurrentLoading(CacheBuilder.newBuilder());
}
public void testConcurrentExpirationLoading() throws InterruptedException {
testConcurrentLoading(CacheBuilder.newBuilder().expireAfterWrite(10, TimeUnit.SECONDS));
}
private static void testConcurrentLoading(CacheBuilder<Object, Object> builder)
throws InterruptedException {
testConcurrentLoadingDefault(builder);
testConcurrentLoadingNull(builder);
testConcurrentLoadingUncheckedException(builder);
testConcurrentLoadingCheckedException(builder);
}
/**
* On a successful concurrent computation, only one thread does the work, but all the threads get
* the same result.
*/
private static void testConcurrentLoadingDefault(CacheBuilder<Object, Object> builder)
throws InterruptedException {
int count = 10;
final AtomicInteger callCount = new AtomicInteger();
final CountDownLatch startSignal = new CountDownLatch(count + 1);
final Object result = new Object();
LoadingCache<String, Object> cache = builder.build(
new CacheLoader<String, Object>() {
@Override public Object load(String key) throws InterruptedException {
callCount.incrementAndGet();
startSignal.await();
return result;
}
});
List<Object> resultArray = doConcurrentGet(cache, "bar", count, startSignal);
assertEquals(1, callCount.get());
for (int i = 0; i < count; i++) {
assertSame("result(" + i + ") didn't match expected", result, resultArray.get(i));
}
}
/**
* On a concurrent computation that returns null, all threads should get an
* InvalidCacheLoadException, with the loader only called once. The result should not be cached
* (a later request should call the loader again).
*/
private static void testConcurrentLoadingNull(CacheBuilder<Object, Object> builder)
throws InterruptedException {
int count = 10;
final AtomicInteger callCount = new AtomicInteger();
final CountDownLatch startSignal = new CountDownLatch(count + 1);
LoadingCache<String, String> cache = builder.build(
new CacheLoader<String, String>() {
@Override public String load(String key) throws InterruptedException {
callCount.incrementAndGet();
startSignal.await();
return null;
}
});
List<Object> result = doConcurrentGet(cache, "bar", count, startSignal);
assertEquals(1, callCount.get());
for (int i = 0; i < count; i++) {
assertThat(result.get(i)).isInstanceOf(InvalidCacheLoadException.class);
}
// subsequent calls should call the loader again, not get the old exception
try {
cache.getUnchecked("bar");
fail();
} catch (InvalidCacheLoadException expected) {
}
assertEquals(2, callCount.get());
}
/**
* On a concurrent computation that throws an unchecked exception, all threads should get the
* (wrapped) exception, with the loader called only once. The result should not be cached (a later
* request should call the loader again).
*/
private static void testConcurrentLoadingUncheckedException(
CacheBuilder<Object, Object> builder) throws InterruptedException {
int count = 10;
final AtomicInteger callCount = new AtomicInteger();
final CountDownLatch startSignal = new CountDownLatch(count + 1);
final RuntimeException e = new RuntimeException();
LoadingCache<String, String> cache = builder.build(
new CacheLoader<String, String>() {
@Override public String load(String key) throws InterruptedException {
callCount.incrementAndGet();
startSignal.await();
throw e;
}
});
List<Object> result = doConcurrentGet(cache, "bar", count, startSignal);
assertEquals(1, callCount.get());
for (int i = 0; i < count; i++) {
// doConcurrentGet alternates between calling getUnchecked and calling get, but an unchecked
// exception thrown by the loader is always wrapped as an UncheckedExecutionException.
assertThat(result.get(i)).isInstanceOf(UncheckedExecutionException.class);
assertSame(e, ((UncheckedExecutionException) result.get(i)).getCause());
}
// subsequent calls should call the loader again, not get the old exception
try {
cache.getUnchecked("bar");
fail();
} catch (UncheckedExecutionException expected) {
}
assertEquals(2, callCount.get());
}
/**
* On a concurrent computation that throws a checked exception, all threads should get the
* (wrapped) exception, with the loader called only once. The result should not be cached (a later
* request should call the loader again).
*/
private static void testConcurrentLoadingCheckedException(
CacheBuilder<Object, Object> builder) throws InterruptedException {
int count = 10;
final AtomicInteger callCount = new AtomicInteger();
final CountDownLatch startSignal = new CountDownLatch(count + 1);
final IOException e = new IOException();
LoadingCache<String, String> cache = builder.build(
new CacheLoader<String, String>() {
@Override public String load(String key) throws IOException, InterruptedException {
callCount.incrementAndGet();
startSignal.await();
throw e;
}
});
List<Object> result = doConcurrentGet(cache, "bar", count, startSignal);
assertEquals(1, callCount.get());
for (int i = 0; i < count; i++) {
// doConcurrentGet alternates between calling getUnchecked and calling get. If we call get(),
// we should get an ExecutionException; if we call getUnchecked(), we should get an
// UncheckedExecutionException.
int mod = i % 3;
if (mod == 0 || mod == 2) {
assertThat(result.get(i)).isInstanceOf(ExecutionException.class);
assertSame(e, ((ExecutionException) result.get(i)).getCause());
} else {
assertThat(result.get(i)).isInstanceOf(UncheckedExecutionException.class);
assertSame(e, ((UncheckedExecutionException) result.get(i)).getCause());
}
}
// subsequent calls should call the loader again, not get the old exception
try {
cache.getUnchecked("bar");
fail();
} catch (UncheckedExecutionException expected) {
}
assertEquals(2, callCount.get());
}
/**
* Test-helper method that performs {@code nThreads} concurrent calls to {@code cache.get(key)}
* or {@code cache.getUnchecked(key)}, and returns a List containing each of the results. The
* result for any given call to {@code cache.get} or {@code cache.getUnchecked} is the value
* returned, or the exception thrown.
*
* <p>As we iterate from {@code 0} to {@code nThreads}, threads with an even index will call
* {@code getUnchecked}, and threads with an odd index will call {@code get}. If the cache throws
* exceptions, this difference may be visible in the returned List.
*/
private static <K> List doConcurrentGet(final LoadingCache cache, final K key,
int nThreads, final CountDownLatch gettersStartedSignal) throws InterruptedException {
final AtomicReferenceArray<Object> result = new AtomicReferenceArray(nThreads);
final CountDownLatch gettersComplete = new CountDownLatch(nThreads);
for (int i = 0; i < nThreads; i++) {
final int index = i;
Thread thread = new Thread(new Runnable() {
@Override public void run() {
gettersStartedSignal.countDown();
Object value = null;
try {
int mod = index % 3;
if (mod == 0) {
value = cache.get(key);
} else if (mod == 1) {
value = cache.getUnchecked(key);
} else {
cache.refresh(key);
value = cache.get(key);
}
result.set(index, value);
} catch (Throwable t) {
result.set(index, t);
}
gettersComplete.countDown();
}
});
thread.start();
// we want to wait until each thread is WAITING - one thread waiting inside CacheLoader.load
// (in startSignal.await()), and the others waiting for that thread's result.
while (thread.isAlive() && thread.getState() != Thread.State.WAITING) {
Thread.yield();
}
}
gettersStartedSignal.countDown();
gettersComplete.await();
List<Object> resultList = Lists.newArrayListWithExpectedSize(nThreads);
for (int i = 0; i < nThreads; i++) {
resultList.add(result.get(i));
}
return resultList;
}
public void testAsMapDuringLoading() throws InterruptedException, ExecutionException {
final CountDownLatch getStartedSignal = new CountDownLatch(2);
final CountDownLatch letGetFinishSignal = new CountDownLatch(1);
final CountDownLatch getFinishedSignal = new CountDownLatch(2);
final String getKey = "get";
final String refreshKey = "refresh";
final String suffix = "Suffix";
CacheLoader<String, String> computeFunction = new CacheLoader() {
@Override
public String load(String key) throws InterruptedException {
getStartedSignal.countDown();
letGetFinishSignal.await();
return key + suffix;
}
};
final LoadingCache<String, String> cache = CacheBuilder.newBuilder()
.build(computeFunction);
ConcurrentMap<String,String> map = cache.asMap();
map.put(refreshKey, refreshKey);
assertEquals(1, map.size());
assertFalse(map.containsKey(getKey));
assertSame(refreshKey, map.get(refreshKey));
new Thread() {
@Override
public void run() {
cache.getUnchecked(getKey);
getFinishedSignal.countDown();
}
}.start();
new Thread() {
@Override
public void run() {
cache.refresh(refreshKey);
getFinishedSignal.countDown();
}
}.start();
getStartedSignal.await();
// computation is in progress; asMap shouldn't have changed
assertEquals(1, map.size());
assertFalse(map.containsKey(getKey));
assertSame(refreshKey, map.get(refreshKey));
// let computation complete
letGetFinishSignal.countDown();
getFinishedSignal.await();
checkNothingLogged();
// asMap view should have been updated
assertEquals(2, cache.size());
assertEquals(getKey + suffix, map.get(getKey));
assertEquals(refreshKey + suffix, map.get(refreshKey));
}
public void testInvalidateDuringLoading() throws InterruptedException, ExecutionException {
// computation starts; invalidate() is called on the key being computed, computation finishes
final CountDownLatch computationStarted = new CountDownLatch(2);
final CountDownLatch letGetFinishSignal = new CountDownLatch(1);
final CountDownLatch getFinishedSignal = new CountDownLatch(2);
final String getKey = "get";
final String refreshKey = "refresh";
final String suffix = "Suffix";
CacheLoader<String, String> computeFunction = new CacheLoader() {
@Override
public String load(String key) throws InterruptedException {
computationStarted.countDown();
letGetFinishSignal.await();
return key + suffix;
}
};
final LoadingCache<String, String> cache = CacheBuilder.newBuilder()
.build(computeFunction);
ConcurrentMap<String,String> map = cache.asMap();
map.put(refreshKey, refreshKey);
new Thread() {
@Override
public void run() {
cache.getUnchecked(getKey);
getFinishedSignal.countDown();
}
}.start();
new Thread() {
@Override
public void run() {
cache.refresh(refreshKey);
getFinishedSignal.countDown();
}
}.start();
computationStarted.await();
cache.invalidate(getKey);
cache.invalidate(refreshKey);
assertFalse(map.containsKey(getKey));
assertFalse(map.containsKey(refreshKey));
// let computation complete
letGetFinishSignal.countDown();
getFinishedSignal.await();
checkNothingLogged();
// results should be visible
assertEquals(2, cache.size());
assertEquals(getKey + suffix, map.get(getKey));
assertEquals(refreshKey + suffix, map.get(refreshKey));
assertEquals(2, cache.size());
}
public void testInvalidateAndReloadDuringLoading()
throws InterruptedException, ExecutionException {
// computation starts; clear() is called, computation finishes
final CountDownLatch computationStarted = new CountDownLatch(2);
final CountDownLatch letGetFinishSignal = new CountDownLatch(1);
final CountDownLatch getFinishedSignal = new CountDownLatch(4);
final String getKey = "get";
final String refreshKey = "refresh";
final String suffix = "Suffix";
CacheLoader<String, String> computeFunction = new CacheLoader() {
@Override
public String load(String key) throws InterruptedException {
computationStarted.countDown();
letGetFinishSignal.await();
return key + suffix;
}
};
final LoadingCache<String, String> cache = CacheBuilder.newBuilder()
.build(computeFunction);
ConcurrentMap<String,String> map = cache.asMap();
map.put(refreshKey, refreshKey);
new Thread() {
@Override
public void run() {
cache.getUnchecked(getKey);
getFinishedSignal.countDown();
}
}.start();
new Thread() {
@Override
public void run() {
cache.refresh(refreshKey);
getFinishedSignal.countDown();
}
}.start();
computationStarted.await();
cache.invalidate(getKey);
cache.invalidate(refreshKey);
assertFalse(map.containsKey(getKey));
assertFalse(map.containsKey(refreshKey));
// start new computations
new Thread() {
@Override
public void run() {
cache.getUnchecked(getKey);
getFinishedSignal.countDown();
}
}.start();
new Thread() {
@Override
public void run() {
cache.refresh(refreshKey);
getFinishedSignal.countDown();
}
}.start();
// let computation complete
letGetFinishSignal.countDown();
getFinishedSignal.await();
checkNothingLogged();
// results should be visible
assertEquals(2, cache.size());
assertEquals(getKey + suffix, map.get(getKey));
assertEquals(refreshKey + suffix, map.get(refreshKey));
}
public void testExpandDuringLoading() throws InterruptedException {
final int count = 3;
final AtomicInteger callCount = new AtomicInteger();
// tells the computing thread when to start computing
final CountDownLatch computeSignal = new CountDownLatch(1);
// tells the main thread when computation is pending
final CountDownLatch secondSignal = new CountDownLatch(1);
// tells the main thread when the second get has started
final CountDownLatch thirdSignal = new CountDownLatch(1);
// tells the main thread when the third get has started
final CountDownLatch fourthSignal = new CountDownLatch(1);
// tells the test when all gets have returned
final CountDownLatch doneSignal = new CountDownLatch(count);
CacheLoader<String, String> computeFunction = new CacheLoader() {
@Override
public String load(String key) throws InterruptedException {
callCount.incrementAndGet();
secondSignal.countDown();
computeSignal.await();
return key + "foo";
}
};
final LoadingCache<String, String> cache = CacheBuilder.newBuilder()
.weakKeys()
.build(computeFunction);
final AtomicReferenceArray<String> result = new AtomicReferenceArray(count);
final String key = "bar";
// start computing thread
new Thread() {
@Override
public void run() {
result.set(0, cache.getUnchecked(key));
doneSignal.countDown();
}
}.start();
// wait for computation to start
secondSignal.await();
// start waiting thread
new Thread() {
@Override
public void run() {
thirdSignal.countDown();
result.set(1, cache.getUnchecked(key));
doneSignal.countDown();
}
}.start();
// give the second get a chance to run; it is okay for this to be racy
// as the end result should be the same either way
thirdSignal.await();
Thread.yield();
// Expand!
CacheTesting.forceExpandSegment(cache, key);
// start another waiting thread
new Thread() {
@Override
public void run() {
fourthSignal.countDown();
result.set(2, cache.getUnchecked(key));
doneSignal.countDown();
}
}.start();
// give the third get a chance to run; it is okay for this to be racy
// as the end result should be the same either way
fourthSignal.await();
Thread.yield();
// let computation finish
computeSignal.countDown();
doneSignal.await();
assertTrue(callCount.get() == 1);
assertEquals("barfoo", result.get(0));
assertEquals("barfoo", result.get(1));
assertEquals("barfoo", result.get(2));
assertEquals("barfoo", cache.getUnchecked(key));
}
// Test ignored because it is extremely flaky in CI builds
public void
ignoreTestExpandDuringRefresh()
throws InterruptedException, ExecutionException {
final AtomicInteger callCount = new AtomicInteger();
// tells the computing thread when to start computing
final CountDownLatch computeSignal = new CountDownLatch(1);
// tells the main thread when computation is pending
final CountDownLatch secondSignal = new CountDownLatch(1);
// tells the main thread when the second get has started
final CountDownLatch thirdSignal = new CountDownLatch(1);
// tells the main thread when the third get has started
final CountDownLatch fourthSignal = new CountDownLatch(1);
// tells the test when all gets have returned
final CountDownLatch doneSignal = new CountDownLatch(3);
final String suffix = "Suffix";
CacheLoader<String, String> computeFunction = new CacheLoader() {
@Override
public String load(String key) throws InterruptedException {
callCount.incrementAndGet();
secondSignal.countDown();
computeSignal.await();
return key + suffix;
}
};
final AtomicReferenceArray<String> result = new AtomicReferenceArray(2);
final LoadingCache<String, String> cache = CacheBuilder.newBuilder()
.build(computeFunction);
final String key = "bar";
cache.asMap().put(key, key);
// start computing thread
new Thread() {
@Override
public void run() {
cache.refresh(key);
doneSignal.countDown();
}
}.start();
// wait for computation to start
secondSignal.await();
checkNothingLogged();
// start waiting thread
new Thread() {
@Override
public void run() {
thirdSignal.countDown();
result.set(0, cache.getUnchecked(key));
doneSignal.countDown();
}
}.start();
// give the second get a chance to run; it is okay for this to be racy
// as the end result should be the same either way
thirdSignal.await();
Thread.yield();
// Expand!
CacheTesting.forceExpandSegment(cache, key);
// start another waiting thread
new Thread() {
@Override
public void run() {
fourthSignal.countDown();
result.set(1, cache.getUnchecked(key));
doneSignal.countDown();
}
}.start();
// give the third get a chance to run; it is okay for this to be racy
// as the end result should be the same either way
fourthSignal.await();
Thread.yield();
// let computation finish
computeSignal.countDown();
doneSignal.await();
assertTrue(callCount.get() == 1);
assertEquals(key, result.get(0));
assertEquals(key, result.get(1));
assertEquals(key + suffix, cache.getUnchecked(key));
}
static <T> Callable throwing(final Exception exception) {
return new Callable<T>() {
@Override public T call() throws Exception {
throw exception;
}
};
}
}
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