/*
* 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.internal.nearcache.impl;
import com.hazelcast.config.NearCacheConfig;
import com.hazelcast.config.NearCachePreloaderConfig;
import com.hazelcast.internal.adapter.DataStructureAdapter;
import com.hazelcast.internal.nearcache.NearCache;
import com.hazelcast.internal.nearcache.NearCacheManager;
import com.hazelcast.monitor.NearCacheStats;
import com.hazelcast.spi.TaskScheduler;
import com.hazelcast.spi.serialization.SerializationService;
import java.util.Collection;
import java.util.HashSet;
import java.util.Queue;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.ScheduledFuture;
import static java.util.concurrent.TimeUnit.MILLISECONDS;
import static java.util.concurrent.TimeUnit.SECONDS;
public class DefaultNearCacheManager implements NearCacheManager {
protected final SerializationService serializationService;
protected final TaskScheduler scheduler;
protected final ClassLoader classLoader;
private final Queue<ScheduledFuture> preloadTaskFutures = new ConcurrentLinkedQueue<ScheduledFuture>();
private final ConcurrentMap<String, NearCache> nearCacheMap = new ConcurrentHashMap<String, NearCache>();
private final Object mutex = new Object();
private volatile ScheduledFuture storageTaskFuture;
public DefaultNearCacheManager(SerializationService ss, TaskScheduler es, ClassLoader classLoader) {
assert ss != null;
assert es != null;
this.serializationService = ss;
this.scheduler = es;
this.classLoader = classLoader;
}
@Override
@SuppressWarnings("unchecked")
public <K, V> NearCache<K, V> getNearCache(String name) {
return nearCacheMap.get(name);
}
@Override
public <K, V> NearCache<K, V> getOrCreateNearCache(String name, NearCacheConfig nearCacheConfig) {
return getOrCreateNearCache(name, nearCacheConfig, null);
}
@Override
@SuppressWarnings("unchecked")
public <K, V> NearCache<K, V> getOrCreateNearCache(String name,
NearCacheConfig nearCacheConfig,
DataStructureAdapter dataStructureAdapter) {
NearCache<K, V> nearCache = nearCacheMap.get(name);
if (nearCache == null) {
synchronized (mutex) {
nearCache = nearCacheMap.get(name);
if (nearCache == null) {
nearCache = createNearCache(name, nearCacheConfig);
nearCache.initialize();
nearCacheMap.put(name, nearCache);
if (nearCache.getPreloaderConfig().isEnabled()) {
createAndSchedulePreloadTask(nearCache, dataStructureAdapter);
createAndScheduleStorageTask();
}
}
}
}
return nearCache;
}
protected <K, V> NearCache<K, V> createNearCache(String name, NearCacheConfig nearCacheConfig) {
return new DefaultNearCache<K, V>(name, nearCacheConfig, serializationService, scheduler, classLoader);
}
@Override
public Collection<NearCache> listAllNearCaches() {
return nearCacheMap.values();
}
@Override
public boolean clearNearCache(String name) {
NearCache nearCache = nearCacheMap.get(name);
if (nearCache != null) {
nearCache.clear();
}
return nearCache != null;
}
@Override
public void clearAllNearCaches() {
for (NearCache nearCache : nearCacheMap.values()) {
nearCache.clear();
}
}
@Override
public boolean destroyNearCache(String name) {
NearCache nearCache = nearCacheMap.remove(name);
if (nearCache != null) {
nearCache.destroy();
}
return nearCache != null;
}
@Override
public void destroyAllNearCaches() {
for (NearCache nearCache : new HashSet<NearCache>(nearCacheMap.values())) {
nearCacheMap.remove(nearCache.getName());
nearCache.destroy();
}
for (ScheduledFuture preloadTaskFuture : preloadTaskFutures) {
preloadTaskFuture.cancel(true);
}
if (storageTaskFuture != null) {
storageTaskFuture.cancel(true);
}
}
private void createAndSchedulePreloadTask(NearCache nearCache, DataStructureAdapter adapter) {
if (adapter != null) {
PreloadTask preloadTask = new PreloadTask(nearCache, adapter);
ScheduledFuture<?> scheduledFuture = scheduler.schedule(preloadTask, 3, SECONDS);
preloadTask.scheduledFuture = scheduledFuture;
preloadTaskFutures.add(scheduledFuture);
}
}
private void createAndScheduleStorageTask() {
if (storageTaskFuture == null) {
StorageTask storageTask = new StorageTask();
storageTaskFuture = scheduler.scheduleWithRepetition(storageTask, 0, 1, SECONDS);
}
}
private class PreloadTask implements Runnable {
private final NearCache nearCache;
private final DataStructureAdapter adapter;
private volatile ScheduledFuture<?> scheduledFuture;
PreloadTask(NearCache nearCache, DataStructureAdapter adapter) {
this.nearCache = nearCache;
this.adapter = adapter;
}
@Override
@SuppressWarnings("unchecked")
public void run() {
nearCache.preload(adapter);
ScheduledFuture<?> future = scheduledFuture;
if (future != null) {
preloadTaskFutures.remove(future);
}
}
}
private class StorageTask implements Runnable {
private final long started = System.currentTimeMillis();
@Override
public void run() {
long now = System.currentTimeMillis();
for (NearCache nearCache : nearCacheMap.values()) {
if (!isScheduled(nearCache, now)) {
continue;
}
nearCache.storeKeys();
}
}
private boolean isScheduled(NearCache nearCache, long now) {
NearCacheStats nearCacheStats = nearCache.getNearCacheStats();
NearCachePreloaderConfig preloaderConfig = nearCache.getPreloaderConfig();
if (nearCacheStats.getLastPersistenceTime() == 0) {
// check initial delay seconds for first persistence
long runningSeconds = MILLISECONDS.toSeconds(now - started);
if (runningSeconds < preloaderConfig.getStoreInitialDelaySeconds()) {
return false;
}
} else {
// check interval seconds for all other persistences
long elapsedSeconds = MILLISECONDS.toSeconds(now - nearCacheStats.getLastPersistenceTime());
if (elapsedSeconds < preloaderConfig.getStoreIntervalSeconds()) {
return false;
}
}
return true;
}
}
protected SerializationService getSerializationService() {
return serializationService;
}
protected TaskScheduler getScheduler() {
return scheduler;
}
protected ClassLoader getClassLoader() {
return classLoader;
}
}