RandomStrategy.java

/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you 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.apache.cxf.clustering;

import java.util.List;
import java.util.Random;

/**
 * Failover strategy based on a randomized walk through the
 * static cluster represented by multiple endpoints associated
 * with the same service instance.
 */
public class RandomStrategy extends AbstractStaticFailoverStrategy {

    private Random random;

    /**
     * Constructor.
     */
    public RandomStrategy() {
        random = new Random();
    }

    /**
     * Get next alternate endpoint.
     *
     * @param alternates non-empty List of alternate endpoints
     * @return
     */
    protected <T> T getNextAlternate(List<T> alternates) {
        return alternates.remove(random.nextInt(alternates.size()));
    }
}