/*
* Copyright (c) 2008-2017, Hazelcast, Inc. All Rights Reserved.
*
* 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.hazelcast.map.impl.mapstore.writebehind;
import com.hazelcast.config.Config;
import com.hazelcast.config.MapConfig;
import com.hazelcast.config.MapStoreConfig;
import com.hazelcast.core.HazelcastInstance;
import com.hazelcast.core.IMap;
import com.hazelcast.core.MapStoreAdapter;
import com.hazelcast.test.HazelcastSerialClassRunner;
import com.hazelcast.test.HazelcastTestSupport;
import com.hazelcast.test.annotation.ParallelTest;
import com.hazelcast.test.annotation.QuickTest;
import org.junit.Test;
import org.junit.experimental.categories.Category;
import org.junit.runner.RunWith;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicReference;
import static org.junit.Assert.assertNull;
@RunWith(HazelcastSerialClassRunner.class)
@Category({QuickTest.class, ParallelTest.class})
public class WriteBehindStaleReadTest extends HazelcastTestSupport {
@Test
public void testMapReturnsNull_afterLastRemove_onSameKey() throws Exception {
String mapName = randomMapName();
final WaitingMapStore mapStore = new WaitingMapStore<Integer, Integer>();
Config config = createConfig(mapName, mapStore);
HazelcastInstance node = createHazelcastInstance(config);
IMap<Object, Object> map = node.getMap(mapName);
mapStore.map = map;
mapStore.waitAllWriteOperations = new CountDownLatch(1);
mapStore.waitForSecondStoreOperation = new CountDownLatch(2);
map.put(1, 0);
map.remove(1);
map.put(1, 1);
map.remove(1);
mapStore.waitAllWriteOperations.countDown();
mapStore.waitForSecondStoreOperation.await();
assertNull(mapStore.valueAfterMapGet.get());
}
private static Config createConfig(String mapName, WaitingMapStore mapStore) {
Config config = new Config();
MapConfig mapConfig = config.getMapConfig(mapName);
MapStoreConfig mapStoreConfig = new MapStoreConfig();
mapStoreConfig.setEnabled(true);
mapStoreConfig.setWriteDelaySeconds(1);
mapStoreConfig.setWriteBatchSize(1);
mapStoreConfig.setImplementation(mapStore);
mapStoreConfig.setWriteCoalescing(false);
mapConfig.setMapStoreConfig(mapStoreConfig);
return config;
}
public static class WaitingMapStore<K, V> extends MapStoreAdapter<K, V> {
public IMap map;
public Map<K, V> store;
CountDownLatch waitAllWriteOperations;
CountDownLatch waitForSecondStoreOperation;
AtomicReference<Object> valueAfterMapGet = new AtomicReference<Object>();
private AtomicInteger countAdd = new AtomicInteger();
public WaitingMapStore() {
store = new ConcurrentHashMap<K, V>();
}
@Override
public void delete(final K key) {
await();
store.remove(key);
}
private void await() {
try {
waitAllWriteOperations.await();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
@Override
public void store(final K key, final V value) {
await();
store.put(key, value);
int get = countAdd.incrementAndGet();
if (get == 2) {
valueAfterMapGet.set(map.get(1));
}
waitForSecondStoreOperation.countDown();
}
@Override
public V load(K key) {
return store.get(key);
}
}
}