/*
* JBoss, Home of Professional Open Source
* Copyright 2009 Red Hat Inc. and/or its affiliates and other
* contributors as indicated by the @author tags. All rights reserved.
* See the copyright.txt in the distribution for a full listing of
* individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.infinispan.loaders.decorators;
import org.infinispan.Cache;
import org.infinispan.marshall.StreamingMarshaller;
import org.infinispan.transaction.xa.GlobalTransaction;
import org.infinispan.container.entries.InternalCacheEntry;
import org.infinispan.loaders.CacheLoader;
import org.infinispan.loaders.CacheLoaderConfig;
import org.infinispan.loaders.CacheLoaderException;
import org.infinispan.loaders.CacheStore;
import org.infinispan.loaders.CacheStoreConfig;
import org.infinispan.loaders.modifications.Modification;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
/**
* A chaining cache loader that allows us to configure > 1 cache loader.
* <p/>
* READ operations are directed to each of the cache loaders (in the order which they were
* configured) until a non-null (or non-empty in the case of retrieving collection objects) result
* is achieved.
* <p/>
* WRITE operations are propagated to ALL registered cache stores specified, except those that set
* ignoreModifications to false.
*
* @author Manik Surtani
* @since 4.0
*/
public class ChainingCacheStore implements CacheStore {
// linked hash sets used since it provides fast (O(1)) iteration, maintains order and provides O(1) lookups to values as well.
LinkedHashMap<CacheLoader, CacheLoaderConfig> loaders = new LinkedHashMap<CacheLoader, CacheLoaderConfig>(2);
LinkedHashMap<CacheStore, CacheLoaderConfig> stores = new LinkedHashMap<CacheStore, CacheLoaderConfig>(2);
@Override
public void store(InternalCacheEntry ed) throws CacheLoaderException {
for (CacheStore s : stores.keySet()) s.store(ed);
}
@Override
public void fromStream(ObjectInput inputStream) throws CacheLoaderException {
// loading and storing state via streams is *only* supported on the *first* store that has fetchPersistentState set.
for (Map.Entry<CacheStore, CacheLoaderConfig> e : stores.entrySet()) {
if (!(e.getValue() instanceof CacheStoreConfig)) continue;
if (((CacheStoreConfig) e.getValue()).isFetchPersistentState()) {
e.getKey().fromStream(inputStream);
// do NOT continue this for other stores, since the stream will not be in an appropriate state anymore
break;
}
}
}
@Override
public void toStream(ObjectOutput outputStream) throws CacheLoaderException {
// loading and storing state via streams is *only* supported on the *first* store that has fetchPersistentState set.
for (Map.Entry<CacheStore, CacheLoaderConfig> e : stores.entrySet()) {
if (!(e.getValue() instanceof CacheStoreConfig)) continue;
if (((CacheStoreConfig) e.getValue()).isFetchPersistentState()) {
e.getKey().toStream(outputStream);
// do NOT continue this for other stores, since the stream will not be in an appropriate state anymore
break;
}
}
}
@Override
public void clear() throws CacheLoaderException {
for (CacheStore s : stores.keySet()) s.clear();
}
@Override
public boolean remove(Object key) throws CacheLoaderException {
boolean r = false;
for (CacheStore s : stores.keySet()) r = s.remove(key) || r;
return r;
}
@Override
public void removeAll(Set<Object> keys) throws CacheLoaderException {
for (CacheStore s : stores.keySet()) s.removeAll(keys);
}
@Override
public void purgeExpired() throws CacheLoaderException {
for (CacheStore s : stores.keySet()) s.purgeExpired();
}
@Override
public void commit(GlobalTransaction tx) throws CacheLoaderException {
for (CacheStore s : stores.keySet()) s.commit(tx);
}
@Override
public void rollback(GlobalTransaction tx) {
for (CacheStore s : stores.keySet()) s.rollback(tx);
}
@Override
public void prepare(List<? extends Modification> list, GlobalTransaction tx, boolean isOnePhase) throws CacheLoaderException {
for (CacheStore s : stores.keySet()) s.prepare(list, tx, isOnePhase);
}
@Override
public void init(CacheLoaderConfig config, Cache<?, ?> cache, StreamingMarshaller m) throws CacheLoaderException {
for (Map.Entry<CacheLoader, CacheLoaderConfig> e : loaders.entrySet()) {
e.getKey().init(e.getValue(), cache, m);
}
}
@Override
public InternalCacheEntry load(Object key) throws CacheLoaderException {
InternalCacheEntry se = null;
for (CacheLoader l : loaders.keySet()) {
se = l.load(key);
if (se != null) break;
}
return se;
}
@Override
public Set<InternalCacheEntry> loadAll() throws CacheLoaderException {
Set<InternalCacheEntry> set = new HashSet<InternalCacheEntry>();
for (CacheStore s : stores.keySet()) set.addAll(s.loadAll());
return set;
}
@Override
public Set<InternalCacheEntry> load(int numEntries) throws CacheLoaderException {
if (numEntries < 0) return loadAll();
Set<InternalCacheEntry> set = new HashSet<InternalCacheEntry>(numEntries);
for (CacheStore s: stores.keySet()) {
Set<InternalCacheEntry> localSet = s.load(numEntries);
Iterator<InternalCacheEntry> i = localSet.iterator();
while (set.size() < numEntries && i.hasNext()) set.add(i.next());
if (set.size() >= numEntries) break;
}
return set;
}
@Override
public Set<Object> loadAllKeys(Set<Object> keysToExclude) throws CacheLoaderException {
Set<Object> set = new HashSet<Object>();
for (CacheStore s : stores.keySet()) set.addAll(s.loadAllKeys(keysToExclude));
return set;
}
@Override
public boolean containsKey(Object key) throws CacheLoaderException {
for (CacheLoader l : loaders.keySet()) {
if (l.containsKey(key)) return true;
}
return false;
}
@Override
public Class<? extends CacheLoaderConfig> getConfigurationClass() {
return null;
}
@Override
public void start() throws CacheLoaderException {
for (CacheLoader l : loaders.keySet()) l.start();
}
@Override
public void stop() throws CacheLoaderException {
for (CacheLoader l : loaders.keySet()) l.stop();
}
public void addCacheLoader(CacheLoader loader, CacheLoaderConfig config) {
loaders.put(loader, config);
if (loader instanceof CacheStore) stores.put((CacheStore) loader, config);
}
public void purgeIfNecessary() throws CacheLoaderException {
for (Map.Entry<CacheStore, CacheLoaderConfig> e : stores.entrySet()) {
CacheLoaderConfig value = e.getValue();
if (value instanceof CacheStoreConfig && ((CacheStoreConfig) value).isPurgeOnStartup())
e.getKey().clear();
}
}
public LinkedHashMap<CacheStore, CacheLoaderConfig> getStores() {
return stores;
}
@Override
public CacheStoreConfig getCacheStoreConfig() {
return null;
}
@Override
public Iterator<Set<InternalCacheEntry>> loadAllIterator() {
return null;
}
@Override
public boolean supportsLoadIterator() {
return false;
}
@Override
public Iterator<Set<InternalCacheEntry>> loadSomeIterator(int maxEntries) throws CacheLoaderException {
return null;
}
}