org.jalphanode.cluster.SimpleMasterNodeElectionPolicy.java Source code

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Here is the source code for org.jalphanode.cluster.SimpleMasterNodeElectionPolicy.java

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/**
 *    Copyright 2011 Pedro Ribeiro
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *        http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */
package org.jalphanode.cluster;

import java.util.List;

import com.google.common.base.Preconditions;

/**
 * Elects the first node of the cluster as the master node.
 *
 * @author   ribeirux
 * @version  $Revision$
 */
public class SimpleMasterNodeElectionPolicy implements MasterNodeElectionPolicy {

    /**
     * {@inheritDoc}
     */
    @Override
    public NodeAddress elect(final List<NodeAddress> nodes) {
        Preconditions.checkNotNull(nodes, "nodes");
        Preconditions.checkPositionIndex(0, nodes.size(), "nodes");

        return nodes.get(0);
    }

}