/*
* JBoss, Home of Professional Open Source.
* Copyright 2014, Red Hat, Inc., and individual contributors
* as indicated by the @author tags. See the copyright.txt file 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.wildfly.clustering.server.registry;
import java.util.AbstractMap;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.CopyOnWriteArrayList;
import org.infinispan.Cache;
import org.infinispan.commons.util.CloseableIterator;
import org.infinispan.context.Flag;
import org.infinispan.notifications.cachelistener.annotation.CacheEntryCreated;
import org.infinispan.notifications.cachelistener.annotation.CacheEntryModified;
import org.infinispan.notifications.cachelistener.annotation.CacheEntryRemoved;
import org.infinispan.notifications.cachelistener.annotation.TopologyChanged;
import org.infinispan.notifications.cachelistener.event.CacheEntryEvent;
import org.infinispan.notifications.cachelistener.event.CacheEntryRemovedEvent;
import org.infinispan.notifications.cachelistener.event.Event;
import org.infinispan.notifications.cachelistener.event.TopologyChangedEvent;
import org.infinispan.remoting.transport.Address;
import org.wildfly.clustering.ee.Batch;
import org.wildfly.clustering.ee.Batcher;
import org.wildfly.clustering.group.Group;
import org.wildfly.clustering.group.Node;
import org.wildfly.clustering.group.NodeFactory;
import org.wildfly.clustering.registry.Registry;
import org.wildfly.clustering.registry.RegistryEntryProvider;
/**
* Clustered {@link Registry} backed by an Infinispan cache.
* @author Paul Ferraro
* @param <K> key type
* @param <V> value type
*/
@org.infinispan.notifications.Listener
public class CacheRegistry<K, V> implements Registry<K, V> {
private final List<Registry.Listener<K, V>> listeners = new CopyOnWriteArrayList<>();
private final RegistryEntryProvider<K, V> provider;
private final Cache<Node, Map.Entry<K, V>> cache;
private final Batcher<? extends Batch> batcher;
private final Group group;
private final NodeFactory<Address> factory;
public CacheRegistry(CacheRegistryFactoryConfiguration<K, V> config, RegistryEntryProvider<K, V> provider) {
this.cache = config.getCache();
this.batcher = config.getBatcher();
this.group = config.getGroup();
this.factory = config.getNodeFactory();
this.provider = provider;
this.getLocalEntry();
this.cache.addListener(this);
}
@Override
public void close() {
this.cache.removeListener(this);
this.listeners.clear();
final Node node = this.getGroup().getLocalNode();
try (Batch batch = this.batcher.createBatch()) {
this.cache.getAdvancedCache().withFlags(Flag.IGNORE_RETURN_VALUES).remove(node);
}
}
@Override
public void addListener(Registry.Listener<K, V> listener) {
this.listeners.add(listener);
}
@Override
public void removeListener(Registry.Listener<K, V> listener) {
this.listeners.remove(listener);
}
@Override
public Group getGroup() {
return this.group;
}
@Override
public Map<K, V> getEntries() {
Map<K, V> map = new HashMap<>();
try (CloseableIterator<Map.Entry<K, V>> entries = this.cache.values().iterator()) {
while (entries.hasNext()) {
Map.Entry<K, V> entry = entries.next();
map.put(entry.getKey(), entry.getValue());
}
}
return Collections.unmodifiableMap(map);
}
@Override
public Map.Entry<K, V> getEntry(Node node) {
return this.cache.get(node);
}
@Override
public Map.Entry<K, V> getLocalEntry() {
K key = this.provider.getKey();
if (key == null) return null;
final Map.Entry<K, V> entry = new AbstractMap.SimpleImmutableEntry<>(key, this.provider.getValue());
final Node node = this.getGroup().getLocalNode();
try (Batch batch = this.batcher.createBatch()) {
this.cache.getAdvancedCache().withFlags(Flag.IGNORE_RETURN_VALUES).put(node, entry);
}
return entry;
}
@TopologyChanged
public void topologyChanged(TopologyChangedEvent<Address, Node> event) {
if (event.isPre()) return;
List<Address> newAddresses = event.getConsistentHashAtEnd().getMembers();
// Only run on the coordinator
if (!newAddresses.get(0).equals(event.getCache().getCacheManager().getAddress())) return;
Set<Address> addresses = new HashSet<>(event.getConsistentHashAtStart().getMembers());
// Determine which nodes have left the cache view
addresses.removeAll(newAddresses);
final List<Node> nodes = new ArrayList<>(addresses.size());
for (Address address: addresses) {
nodes.add(this.factory.createNode(address));
}
Cache<Node, Map.Entry<K, V>> cache = this.cache.getAdvancedCache().withFlags(Flag.FORCE_SYNCHRONOUS);
Map<K, V> removed = new HashMap<>();
try (Batch batch = this.batcher.createBatch()) {
for (Node node: nodes) {
Map.Entry<K, V> old = cache.remove(node);
if (old != null) {
removed.put(old.getKey(), old.getValue());
}
}
}
if (!removed.isEmpty()) {
for (Listener<K, V> listener: this.listeners) {
listener.removedEntries(removed);
}
}
}
@CacheEntryCreated
@CacheEntryModified
public void event(CacheEntryEvent<Node, Map.Entry<K, V>> event) {
if (event.isOriginLocal() || event.isPre()) return;
if (!this.listeners.isEmpty()) {
this.notifyListeners(event.getType(), event.getValue());
}
}
@CacheEntryRemoved
public void removed(CacheEntryRemovedEvent<Node, Map.Entry<K, V>> event) {
if (event.isOriginLocal() || event.isPre()) return;
if (!this.listeners.isEmpty()) {
this.notifyListeners(event.getType(), event.getOldValue());
}
}
public void notifyListeners(Event.Type type, Map.Entry<K, V> entry) {
Map<K, V> entries = Collections.singletonMap(entry.getKey(), entry.getValue());
for (Listener<K, V> listener: this.listeners) {
switch (type) {
case CACHE_ENTRY_CREATED: {
listener.addedEntries(entries);
break;
}
case CACHE_ENTRY_MODIFIED: {
listener.updatedEntries(entries);
break;
}
case CACHE_ENTRY_REMOVED: {
listener.removedEntries(entries);
break;
}
default: {
throw new IllegalStateException(type.name());
}
}
}
}
}