package org.infinispan.loader.decorators;
import org.infinispan.Cache;
import org.infinispan.container.entries.InternalCacheEntry;
import org.infinispan.loader.CacheLoader;
import org.infinispan.loader.CacheLoaderConfig;
import org.infinispan.loader.CacheLoaderException;
import org.infinispan.loader.CacheStore;
import org.infinispan.loader.CacheStoreConfig;
import org.infinispan.loader.modifications.Modification;
import org.infinispan.marshall.Marshaller;
import javax.transaction.Transaction;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import java.util.HashSet;
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, 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>();
LinkedHashMap<CacheStore, CacheLoaderConfig> stores = new LinkedHashMap<CacheStore, CacheLoaderConfig>();
public void store(InternalCacheEntry ed) throws CacheLoaderException {
for (CacheStore s : stores.keySet()) s.store(ed);
}
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;
}
}
}
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;
}
}
}
public void clear() throws CacheLoaderException {
for (CacheStore s : stores.keySet()) s.clear();
}
public boolean remove(Object key) throws CacheLoaderException {
boolean r = false;
for (CacheStore s : stores.keySet()) r = s.remove(key) || r;
return r;
}
public void removeAll(Set<Object> keys) throws CacheLoaderException {
for (CacheStore s : stores.keySet()) s.removeAll(keys);
}
public void purgeExpired() throws CacheLoaderException {
for (CacheStore s : stores.keySet()) s.purgeExpired();
}
public void commit(Transaction tx) throws CacheLoaderException {
for (CacheStore s : stores.keySet()) s.commit(tx);
}
public void rollback(Transaction tx) {
for (CacheStore s : stores.keySet()) s.rollback(tx);
}
public void prepare(List<? extends Modification> list, Transaction tx, boolean isOnePhase) throws CacheLoaderException {
for (CacheStore s : stores.keySet()) s.prepare(list, tx, isOnePhase);
}
public void init(CacheLoaderConfig config, Cache cache, Marshaller m) {
for (Map.Entry<CacheLoader, CacheLoaderConfig> e : loaders.entrySet()) {
e.getKey().init(e.getValue(), cache, m);
}
}
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;
}
public Set<InternalCacheEntry> loadAll() throws CacheLoaderException {
Set<InternalCacheEntry> set = new HashSet<InternalCacheEntry>();
for (CacheStore s : stores.keySet()) set.addAll(s.loadAll());
return set;
}
public boolean containsKey(Object key) throws CacheLoaderException {
for (CacheLoader l : loaders.keySet()) {
if (l.containsKey(key)) return true;
}
return false;
}
public Class<? extends CacheLoaderConfig> getConfigurationClass() {
return null;
}
public void start() throws CacheLoaderException {
for (CacheLoader l : loaders.keySet()) l.start();
}
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;
}
}