/*
 * 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.infinispan.spi.distribution;

import org.infinispan.Cache;
import org.infinispan.distribution.DistributionManager;
import org.infinispan.distribution.ch.ConsistentHash;
import org.infinispan.remoting.transport.Address;

/**
 * {@link Locality} implementation based on a {@link ConsistentHash}.
 * @author Paul Ferraro
 */
public class ConsistentHashLocality implements Locality {

    private final Address localAddress;
    private final ConsistentHash hash;

    public ConsistentHashLocality(Cache<?, ?> cache) {
        this(cache.getCacheManager().getAddress(), cache.getAdvancedCache().getDistributionManager());
    }

    private ConsistentHashLocality(Address localAddress, DistributionManager dist) {
        this(localAddress, (dist != null) ? dist.getConsistentHash() : null);
    }

    public ConsistentHashLocality(Address localAddress, ConsistentHash hash) {
        this.localAddress = localAddress;
        this.hash = hash;
    }

    @Override
    public boolean isLocal(Object key) {
        if (this.localAddress == null) return true;
        if (this.hash == null) return false;
        return this.localAddress.equals(this.hash.locatePrimaryOwner(key));
    }
}
