ChannelNodeFactory.java example

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wildfly-master
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 * as indicated by the @author tags. See the copyright.txt file in the
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 *
 * 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
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 *
 * 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
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package org.wildfly.clustering.server.group;

import java.net.InetSocketAddress;
import java.util.Collection;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;

import org.jgroups.Address;
import org.jgroups.Channel;
import org.jgroups.Event;
import org.jgroups.stack.IpAddress;
import org.wildfly.clustering.group.Node;

/**
 * Node factory implementation.  Node instances are cached and invalidated by the {@link org.wildfly.clustering.group.Group} when appropriate.
 * @author Paul Ferraro
 */
public class ChannelNodeFactory implements JGroupsNodeFactory, AutoCloseable {

    private final ConcurrentMap<Address, Node> nodes = new ConcurrentHashMap<>();
    private final Channel channel;

    public ChannelNodeFactory(Channel channel) {
        this.channel = channel;
    }

    @Override
    public Node createNode(Address key) {
        return this.nodes.computeIfAbsent(key, (Address address) -> {
            IpAddress ipAddress = (IpAddress) this.channel.down(new Event(Event.GET_PHYSICAL_ADDRESS, address));
            // Physical address might be null if node is no longer a member of the cluster
            InetSocketAddress socketAddress = (ipAddress != null) ? new InetSocketAddress(ipAddress.getIpAddress(), ipAddress.getPort()) : new InetSocketAddress(0);
            String name = this.channel.getName(address);
            if (name == null) {
                // If no logical name exists, create one using physical address
                name = String.format("%s:%s", socketAddress.getHostString(), socketAddress.getPort());
            }
            return new AddressableNode(address, name, socketAddress);
        });
    }

    @Override
    public void close() {
        this.nodes.clear();
    }

    @Override
    public void invalidate(Collection<Address> addresses) {
        if (!addresses.isEmpty()) {
            this.nodes.keySet().removeAll(addresses);
        }
    }
}