net.sf.ehcache.store.DiskBackedMemoryStore Maven / Gradle / Ivy
/**
* Copyright Terracotta, Inc.
*
* 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 net.sf.ehcache.store;
import net.sf.ehcache.CacheException;
import net.sf.ehcache.Ehcache;
import net.sf.ehcache.config.CacheConfiguration;
import net.sf.ehcache.pool.Pool;
import net.sf.ehcache.search.impl.SearchManager;
import net.sf.ehcache.store.disk.DiskStore;
import java.io.Serializable;
/**
* A tiered store using an in-memory cache of elements stored on disk.
*
* @author Ludovic Orban
*/
public final class DiskBackedMemoryStore extends FrontEndCacheTier {
private DiskBackedMemoryStore(CacheConfiguration cacheConfiguration, MemoryStore cache, DiskStore authority, SearchManager searchManager) {
super(cache, authority, cacheConfiguration.getCopyStrategy(), searchManager,
cacheConfiguration.isCopyOnWrite(), cacheConfiguration.isCopyOnRead());
}
/**
* Create a DiskBackedMemoryStore instance
* @param cache the cache
* @param onHeapPool the pool tracking on-heap usage
* @param onDiskPool the pool tracking on-disk usage
* @return a DiskBackedMemoryStore instance
*/
public static Store create(Ehcache cache, Pool onHeapPool, Pool onDiskPool) {
final MemoryStore memoryStore = createMemoryStore(cache, onHeapPool);
DiskStore diskStore = createDiskStore(cache, onHeapPool, onDiskPool);
return new DiskBackedMemoryStore(cache.getCacheConfiguration(), memoryStore, diskStore, null);
}
private static MemoryStore createMemoryStore(Ehcache cache, Pool onHeapPool) {
return MemoryStore.create(cache, onHeapPool);
}
private static DiskStore createDiskStore(Ehcache cache, Pool onHeapPool, Pool onDiskPool) {
CacheConfiguration config = cache.getCacheConfiguration();
if (config.isOverflowToDisk()) {
return DiskStore.create(cache, onHeapPool, onDiskPool);
} else {
throw new CacheException("DiskBackedMemoryStore can only be used when cache overflows to disk or is disk persistent");
}
}
/**
* {@inheritDoc}
*/
public Object getMBean() {
return null;
}
/**
* {@inheritDoc}
*/
@Override
public boolean notifyEvictionFromCache(final Serializable key) {
return authority.cleanUpFailedMarker(key);
}
}