/*
* 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.store;
import com.hazelcast.internal.eviction.EvictionCandidate;
import com.hazelcast.internal.eviction.EvictionListener;
import com.hazelcast.internal.nearcache.NearCacheRecord;
import com.hazelcast.internal.nearcache.impl.SampleableNearCacheRecordMap;
import com.hazelcast.nio.serialization.SerializableByConvention;
import com.hazelcast.spi.serialization.SerializationService;
import com.hazelcast.util.SampleableConcurrentHashMap;
/**
* {@link SampleableNearCacheRecordMap} implementation for on-heap Near Caches.
*
* @param <K> the type of the key stored in Near Cache
* @param <V> the type of the value stored in Near Cache
*/
@SerializableByConvention
public class HeapNearCacheRecordMap<K, V extends NearCacheRecord>
extends SampleableConcurrentHashMap<K, V>
implements SampleableNearCacheRecordMap<K, V> {
private final SerializationService serializationService;
HeapNearCacheRecordMap(SerializationService serializationService, int initialCapacity) {
super(initialCapacity);
this.serializationService = serializationService;
}
public class NearCacheEvictableSamplingEntry extends SamplingEntry<K, V> implements EvictionCandidate<K, V> {
NearCacheEvictableSamplingEntry(K key, V value) {
super(key, value);
}
@Override
public K getAccessor() {
return key;
}
@Override
public V getEvictable() {
return value;
}
@Override
public Object getKey() {
return serializationService.toObject(key);
}
@Override
public Object getValue() {
return serializationService.toObject(value.getValue());
}
@Override
public long getCreationTime() {
return value.getCreationTime();
}
@Override
public long getLastAccessTime() {
return value.getLastAccessTime();
}
@Override
public long getAccessHit() {
return value.getAccessHit();
}
}
@Override
@SuppressWarnings("unchecked")
protected <E extends SamplingEntry> E createSamplingEntry(K key, V value) {
return (E) new NearCacheEvictableSamplingEntry(key, value);
}
@Override
public <C extends EvictionCandidate<K, V>> int evict(Iterable<C> evictionCandidates,
EvictionListener<K, V> evictionListener) {
if (evictionCandidates == null) {
return 0;
}
int actualEvictedCount = 0;
for (EvictionCandidate<K, V> evictionCandidate : evictionCandidates) {
if (remove(evictionCandidate.getAccessor()) != null) {
actualEvictedCount++;
if (evictionListener != null) {
evictionListener.onEvict(evictionCandidate.getAccessor(), evictionCandidate.getEvictable(), false);
}
}
}
return actualEvictedCount;
}
@Override
public Iterable<NearCacheEvictableSamplingEntry> sample(int sampleCount) {
return super.getRandomSamples(sampleCount);
}
}