/*
* JBoss, Home of Professional Open Source.
* Copyright 2011, 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.jboss.as.clustering.service;
import java.util.AbstractMap;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import org.infinispan.Cache;
import org.infinispan.context.Flag;
import org.infinispan.notifications.cachelistener.annotation.CacheEntryModified;
import org.infinispan.notifications.cachelistener.event.CacheEntryModifiedEvent;
import org.jboss.as.clustering.ClusterNode;
import org.jboss.as.clustering.GroupMembershipListener;
import org.jboss.as.clustering.GroupMembershipNotifier;
import org.jboss.as.clustering.impl.CoreGroupCommunicationService;
import org.jboss.as.clustering.infinispan.atomic.AtomicMapCache;
import org.jboss.as.clustering.infinispan.invoker.BatchOperation;
import org.jboss.as.clustering.infinispan.invoker.CacheInvoker;
import org.jboss.as.clustering.infinispan.subsystem.CacheService;
import org.jboss.msc.service.Service;
import org.jboss.msc.service.ServiceBuilder;
import org.jboss.msc.service.ServiceController;
import org.jboss.msc.service.ServiceName;
import org.jboss.msc.service.ServiceTarget;
import org.jboss.msc.service.StartContext;
import org.jboss.msc.service.StartException;
import org.jboss.msc.service.StopContext;
import org.jboss.msc.value.InjectedValue;
/**
* @author Paul Ferraro
*/
@org.infinispan.notifications.Listener(sync = false)
public class ServiceProviderRegistryService implements ServiceProviderRegistry, GroupMembershipListener, Service<ServiceProviderRegistry> {
private static final short SCOPE_ID = 224;
public static ServiceName getServiceName(String name) {
return CoreGroupCommunicationService.getServiceName(name).append("registry");
}
@SuppressWarnings("rawtypes")
private final InjectedValue<Cache> cacheRef = new InjectedValue<Cache>();
private final InjectedValue<GroupMembershipNotifier> notifierRef = new InjectedValue<GroupMembershipNotifier>();
private final Map<String, Listener> listeners = new ConcurrentHashMap<String, Listener>();
private volatile GroupMembershipNotifier notifier;
private volatile Cache<String, Map<ClusterNode, Void>> cache;
public ServiceBuilder<ServiceProviderRegistry> build(ServiceTarget target, String container) {
new CoreGroupCommunicationService(SCOPE_ID).build(target, container).setInitialMode(ServiceController.Mode.ON_DEMAND).install();
return target.addService(getServiceName(container), this)
.addDependency(CacheService.getServiceName(container, null), Cache.class, this.cacheRef)
.addDependency(CoreGroupCommunicationService.getServiceName(container), GroupMembershipNotifier.class, this.notifierRef)
;
}
@Override
public void register(final String service, Listener listener) {
this.listeners.put(service, listener);
final ClusterNode node = this.notifier.getClusterNode();
Operation<Set<ClusterNode>> operation = new Operation<Set<ClusterNode>>() {
@Override
public Set<ClusterNode> invoke(Cache<String, Map<ClusterNode, Void>> cache) {
Map<ClusterNode, Void> map = cache.putIfAbsent(service, null);
map.put(node, null);
return map.keySet();
}
};
Set<ClusterNode> nodes = this.invoke(operation);
listener.serviceProvidersChanged(nodes, false);
}
@Override
public void unregister(final String service) {
final ClusterNode node = this.notifier.getClusterNode();
Operation<Void> operation = new Operation<Void>() {
@Override
public Void invoke(Cache<String, Map<ClusterNode, Void>> cache) {
cache.get(service).remove(node);
return null;
}
};
this.invoke(operation);
this.listeners.remove(service);
}
@Override
public Set<ClusterNode> getServiceProviders(String service) {
return Collections.unmodifiableSet(this.cache.get(service).keySet());
}
@Override
public ServiceProviderRegistry getValue() throws IllegalStateException, IllegalArgumentException {
return this;
}
@Override
public void start(StartContext context) throws StartException {
this.notifier = this.notifierRef.getValue();
this.notifier.registerGroupMembershipListener(this);
@SuppressWarnings("unchecked")
Cache<String, Map<ClusterNode, Void>> cache = this.cacheRef.getValue();
this.cache = new AtomicMapCache<String, ClusterNode, Void>(cache.getAdvancedCache().with(this.getClass().getClassLoader()));
this.cache.addListener(this);
}
@Override
public void stop(StopContext context) {
this.cache.removeListener(this);
this.notifier.unregisterGroupMembershipListener(this);
}
@Override
public void membershipChanged(List<ClusterNode> deadMembers, List<ClusterNode> newMembers, List<ClusterNode> allMembers) {
this.purgeDeadMembers(deadMembers, false);
}
@Override
public void membershipChangedDuringMerge(List<ClusterNode> deadMembers, List<ClusterNode> newMembers, List<ClusterNode> allMembers, List<List<ClusterNode>> originatingGroups) {
this.purgeDeadMembers(deadMembers, true);
}
private void purgeDeadMembers(final List<ClusterNode> deadNodes, final boolean merge) {
Operation<List<Map.Entry<String, Set<ClusterNode>>>> operation = new Operation<List<Map.Entry<String, Set<ClusterNode>>>>() {
@Override
public List<Map.Entry<String, Set<ClusterNode>>> invoke(Cache<String, Map<ClusterNode, Void>> cache) {
// Collect services whose set of providing nodes has changed
List<Map.Entry<String, Set<ClusterNode>>> entries = new ArrayList<Map.Entry<String, Set<ClusterNode>>>(cache.size());
// Remove dead nodes for each service
for (String key: cache.keySet()) {
Map<ClusterNode, Void> map = cache.getAdvancedCache().withFlags(Flag.CACHE_MODE_LOCAL).get(key);
if (map != null) {
Set<ClusterNode> nodes = map.keySet();
if (nodes.removeAll(deadNodes)) {
entries.add(new AbstractMap.SimpleImmutableEntry<String, Set<ClusterNode>>(key, nodes));
}
}
}
return entries;
}
};
for (Map.Entry<String, Set<ClusterNode>> entry: this.invoke(operation)) {
Listener listener = this.listeners.get(entry.getKey());
if (listener != null) {
listener.serviceProvidersChanged(entry.getValue(), merge);
}
}
}
@CacheEntryModified
public void modified(CacheEntryModifiedEvent<String, Map<ClusterNode, Void>> event) {
// Only respond to remote post-modify events
if (event.isPre() || event.isOriginLocal()) return;
final String service = event.getKey();
Listener listener = this.listeners.get(service);
if (listener != null) {
listener.serviceProvidersChanged(event.getValue().keySet(), false);
}
}
private <R> R invoke(Operation<R> operation) {
return new BatchOperation<String, Map<ClusterNode, Void>, R>(operation).invoke(this.cache);
}
abstract class Operation<R> implements CacheInvoker.Operation<String, Map<ClusterNode, Void>, R> {
}
}