org.jboss.ejb.client.RandomClusterNodeSelector Maven / Gradle / Ivy

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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

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/*
 * 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.ejb.client;

import java.util.Random;

/**
 * A {@link ClusterNodeSelector} which {@link Random randomly} selects one of the nodes from either the
 * connected nodes or available non-connected nodes
 *
 * @author Jaikiran Pai
 */
class RandomClusterNodeSelector implements ClusterNodeSelector {

    @Override
    public String selectNode(final String clusterName, final String[] connectedNodes, final String[] availableNodes) {
        final Random random = new Random();
        // check if there are any connected nodes. If there are then just reuse them
        if (connectedNodes.length > 0) {
            if (connectedNodes.length == 1) {
                return connectedNodes[0];
            }
            final int randomConnectedNode = random.nextInt(connectedNodes.length);
            return connectedNodes[randomConnectedNode];
        }
        // there are no connected nodes. so use the available nodes and let the cluster context
        // establish a connection for the selected node
        if (availableNodes.length == 1) {
            return availableNodes[0];
        }
        final int randomSelection = random.nextInt(availableNodes.length);
        return availableNodes[randomSelection];
    }
}