/*
* JBoss, Home of Professional Open Source.
* Copyright 2012, 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.jgroups.subsystem;
import static org.jboss.as.clustering.jgroups.logging.JGroupsLogger.ROOT_LOGGER;
import org.jboss.as.clustering.jgroups.ChannelFactory;
import org.jboss.as.clustering.jgroups.logging.JGroupsLogger;
import org.jboss.as.clustering.naming.JndiNameFactory;
import org.jboss.as.naming.deployment.ContextNames;
import org.jboss.msc.service.Service;
import org.jboss.msc.service.ServiceBuilder;
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;
import org.jgroups.Address;
import org.jgroups.Channel;
import org.jgroups.ChannelListener;
/**
* Provides a channel for use by dependent services.
* Channels produced by this service are unconnected.
* @author Paul Ferraro
*/
public class ChannelService implements Service<Channel>, ChannelListener {
public static final String DEFAULT = "default";
private static final String CHANNEL = "channel";
private static final ServiceName SERVICE_NAME = ServiceName.JBOSS.append(JGroupsExtension.SUBSYSTEM_NAME).append(CHANNEL);
public static ContextNames.BindInfo createChannelBinding(String channel) {
return ContextNames.bindInfoFor(JndiNameFactory.createJndiName(JndiNameFactory.DEFAULT_JNDI_NAMESPACE, JGroupsExtension.SUBSYSTEM_NAME, CHANNEL, channel).getAbsoluteName());
}
public static ServiceName getServiceName(String id) {
return SERVICE_NAME.append((id != null) ? id : DEFAULT);
}
public static ServiceName getFactoryServiceName(String channel) {
return getServiceName(channel).append(ChannelFactoryService.FACTORY);
}
public static ServiceBuilder<Channel> build(ServiceTarget target, String id) {
ChannelService service = new ChannelService(id);
return target.addService(getServiceName(id), service)
.addDependency(ChannelService.getFactoryServiceName(id), ChannelFactory.class, service.factory)
;
}
private final InjectedValue<ChannelFactory> factory = new InjectedValue<>();
private final String id;
private volatile Channel channel;
private ChannelService(String id) {
this.id = id;
}
@Override
public Channel getValue() {
return this.channel;
}
@Override
public void start(StartContext context) throws StartException {
ChannelFactory factory = this.factory.getValue();
try {
this.channel = factory.createChannel(this.id);
this.channel.addChannelListener(this);
} catch (Exception e) {
throw new StartException(e);
}
if (ROOT_LOGGER.isTraceEnabled()) {
String output = this.channel.getProtocolStack().printProtocolSpec(true);
ROOT_LOGGER.tracef("JGroups channel %s created with configuration:\n %s", this.id, output);
}
}
@Override
public void stop(StopContext context) {
if (this.channel != null) {
this.channel.removeChannelListener(this);
this.channel.close();
}
this.channel = null;
}
@Override
public void channelClosed(Channel channel) {
// Do nothing
}
@Override
public void channelConnected(Channel channel) {
// Validate view
String localName = channel.getName();
Address localAddress = channel.getAddress();
for (Address address: channel.getView()) {
String name = channel.getName(address);
if ((name != null) && name.equals(localName) && !address.equals(localAddress)) {
channel.close();
throw JGroupsLogger.ROOT_LOGGER.duplicateNodeName(this.factory.getValue().getProtocolStackConfiguration().getEnvironment().getNodeName());
}
}
}
@Override
public void channelDisconnected(Channel channel) {
// Do nothing
}
}