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LRUCachingMap.java
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LRUCachingMap.java
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// cwshopbot
// Copyright (C) 2019 Marat Bukharov.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package name.maratik.cw.cwshopbot.util;
import com.fasterxml.jackson.databind.util.LRUMap;
import com.google.common.base.Ticker;
import com.google.common.cache.Cache;
import com.google.common.cache.CacheBuilder;
import com.google.common.cache.CacheStats;
import lombok.extern.log4j.Log4j2;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.time.Duration;
import java.time.temporal.ChronoUnit;
import java.util.concurrent.ConcurrentMap;
/**
* @author <a href="mailto:maratik@yandex-team.ru">Marat Bukharov</a>
*/
@Log4j2
public class LRUCachingMap<K, V> extends LRUMap<K, V> {
private static final long serialVersionUID = 1378663091316250420L;
@SuppressWarnings("InstanceVariableMayNotBeInitializedByReadObject")
private final transient Cache<K, V> cache;
@SuppressWarnings("InstanceVariableMayNotBeInitializedByReadObject")
private final transient ConcurrentMap<K, V> cacheMap;
public LRUCachingMap(int maxEntries, Duration expireDuration, Ticker ticker) {
super(0, maxEntries);
_jdkSerializeMaxEntries = maxEntries;
_map.clear();
cache = CacheBuilder.newBuilder()
.ticker(ticker)
.recordStats()
.maximumSize(maxEntries)
.expireAfterAccess(expireDuration)
.removalListener(notification -> log.debug(
"Removed object {} from cache due to {}, evicted = {}",
notification::toString, notification::getCause, notification::wasEvicted
))
.build();
cacheMap = cache.asMap();
}
@Override
public V put(K key, V value) {
return cacheMap.put(key, value);
}
@Override
public V putIfAbsent(K key, V value) {
return cacheMap.putIfAbsent(key, value);
}
@Override
public V get(Object key) {
return cache.getIfPresent(key);
}
@Override
public void clear() {
cache.invalidateAll();
}
@Override
public int size() {
return (int) cache.size();
}
public void cleanUp() {
cache.cleanUp();
}
private void readObject(ObjectInputStream in) throws IOException {
_jdkSerializeMaxEntries = in.readInt();
}
private void writeObject(ObjectOutputStream out) throws IOException {
out.writeInt(_jdkSerializeMaxEntries);
}
@Override
protected Object readResolve() {
return new LRUCachingMap<>(_jdkSerializeMaxEntries, Duration.of(1, ChronoUnit.DAYS), Ticker.systemTicker());
}
public CacheStats stats() {
return cache.stats();
}
}