/*
* 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.provider;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
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.event.CacheEntryEvent;
import org.jboss.msc.service.ServiceName;
import org.wildfly.clustering.dispatcher.CommandDispatcher;
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.provider.ServiceProviderRegistration;
import org.wildfly.clustering.provider.ServiceProviderRegistration.Listener;
import org.wildfly.clustering.provider.ServiceProviderRegistrationFactory;
/**
* Infinispan {@link Cache} based {@link ServiceProviderRegistrationFactory}.
* This factory can create multiple {@link ServiceProviderRegistration} instance,
* all of which share the same {@link Cache} instance.
* @author Paul Ferraro
*/
@org.infinispan.notifications.Listener
public class CacheServiceProviderRegistrationFactory implements ServiceProviderRegistrationFactory, ServiceRegistry, Group.Listener, AutoCloseable {
final ConcurrentMap<Object, Listener> listeners = new ConcurrentHashMap<>();
final Batcher<? extends Batch> batcher;
final Cache<Object, Set<Node>> cache;
private final Group group;
private final CommandDispatcher<ServiceRegistry> dispatcher;
public CacheServiceProviderRegistrationFactory(CacheServiceProviderRegistrationFactoryConfiguration config) {
this.group = config.getGroup();
this.cache = config.getCache();
this.batcher = config.getBatcher();
this.dispatcher = config.getCommandDispatcherFactory().<ServiceRegistry>createCommandDispatcher(config.getId(), this);
this.cache.addListener(this);
this.group.addListener(this);
}
@Override
public void close() {
this.group.removeListener(this);
this.cache.removeListener(this);
this.dispatcher.close();
}
@Override
public Group getGroup() {
return this.group;
}
@Override
public ServiceProviderRegistration createRegistration(final Object service, Listener listener) {
if (this.listeners.putIfAbsent(service, listener) != null) {
throw new IllegalArgumentException(service.toString());
}
final Node node = this.group.getLocalNode();
Set<Node> nodes = new HashSet<>(Collections.singleton(node));
try (Batch batch = this.batcher.createBatch()) {
Set<Node> existing = this.cache.getAdvancedCache().withFlags(Flag.FORCE_SYNCHRONOUS).putIfAbsent(service, nodes);
if (existing != null) {
if (existing.add(node)) {
this.cache.getAdvancedCache().withFlags(Flag.IGNORE_RETURN_VALUES).replace(service, existing);
}
}
}
return new AbstractServiceProviderRegistration(service, this) {
@Override
public void close() {
if (CacheServiceProviderRegistrationFactory.this.listeners.remove(service) != null) {
final Node node = CacheServiceProviderRegistrationFactory.this.getGroup().getLocalNode();
try (Batch batch = CacheServiceProviderRegistrationFactory.this.batcher.createBatch()) {
Set<Node> nodes = CacheServiceProviderRegistrationFactory.this.cache.get(service);
if ((nodes != null) && nodes.remove(node)) {
Cache<Object, Set<Node>> cache = CacheServiceProviderRegistrationFactory.this.cache.getAdvancedCache().withFlags(Flag.IGNORE_RETURN_VALUES);
if (nodes.isEmpty()) {
cache.remove(service);
} else {
cache.replace(service, nodes);
}
}
}
}
}
};
}
@Override
public Set<Node> getProviders(final Object service) {
Set<Node> nodes = this.cache.get(service);
return (nodes != null) ? Collections.unmodifiableSet(nodes) : Collections.<Node>emptySet();
}
@Override
public Set<Object> getServices() {
return this.listeners.keySet();
}
@Override
public void membershipChanged(List<Node> previousMembers, List<Node> members, final boolean merged) {
if (this.getGroup().isCoordinator()) {
final Set<Node> deadNodes = new HashSet<>(previousMembers);
deadNodes.removeAll(members);
final Set<Node> newNodes = new HashSet<>(members);
newNodes.removeAll(previousMembers);
try (Batch batch = this.batcher.createBatch()) {
if (!deadNodes.isEmpty()) {
try (CloseableIterator<Map.Entry<Object, Set<Node>>> entries = this.cache.entrySet().iterator()) {
while (entries.hasNext()) {
Map.Entry<Object, Set<Node>> entry = entries.next();
Set<Node> nodes = entry.getValue();
if (nodes.removeAll(deadNodes)) {
entry.setValue(nodes);
}
}
}
}
if (merged) {
for (Node node: newNodes) {
// Re-assert services for new members following merge since these may have been lost following split
List<Object> services = CacheServiceProviderRegistrationFactory.this.getServices(node);
for (Object service: services) {
Set<Node> nodes = new HashSet<>(Collections.singleton(node));
Set<Node> existing = this.cache.getAdvancedCache().withFlags(Flag.FORCE_SYNCHRONOUS).putIfAbsent(service, nodes);
if (existing != null) {
if (existing.add(node)) {
this.cache.getAdvancedCache().withFlags(Flag.IGNORE_RETURN_VALUES).replace(service, existing);
}
}
}
}
}
}
}
}
@CacheEntryCreated
@CacheEntryModified
public void modified(CacheEntryEvent<ServiceName, Set<Node>> event) {
if (event.isPre()) return;
Listener listener = this.listeners.get(event.getKey());
if (listener != null) {
listener.providersChanged(event.getValue());
}
}
List<Object> getServices(Node node) {
try {
return this.dispatcher.executeOnNode(new ServiceRegistryCommand(), node).get();
} catch (Exception e) {
return Collections.emptyList();
}
}
}