/*
 * 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.jgroups;

import org.jgroups.Address;
import org.jgroups.stack.AddressGenerator;
import org.jgroups.util.ExtendedUUID;
import org.jgroups.util.Util;
import org.wildfly.clustering.jgroups.spi.TransportConfiguration;

/**
 * An AddressGenerator which generates ExtendedUUID addresses with specified site, rack and machine ids.
 *
 * @author Tristan Tarrant
 * @author Paul Ferraro
 */
public class TopologyAddressGenerator implements AddressGenerator {
    // Based on org.jgroups.util.TopologyUUID from JGroups 3.4.x
    private static final byte[] SITE = Util.stringToBytes("site-id");
    private static final byte[] RACK = Util.stringToBytes("rack-id");
    private static final byte[] MACHINE = Util.stringToBytes("machine-id");

    private final TransportConfiguration.Topology topology;

    public TopologyAddressGenerator(TransportConfiguration.Topology topology) {
        this.topology = topology;
    }

    @Override
    public Address generateAddress() {
        ExtendedUUID uuid = ExtendedUUID.randomUUID();
        uuid.put(SITE, Util.stringToBytes(this.topology.getSite()));
        uuid.put(RACK, Util.stringToBytes(this.topology.getRack()));
        uuid.put(MACHINE, Util.stringToBytes(this.topology.getMachine()));
        return uuid;
    }
}