RandomStickyConnectionLoadBalancingPolicy.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.activemq.artemis.api.core.client.loadbalance;

import org.apache.activemq.artemis.utils.RandomUtil;

/**
 * {@link RandomConnectionLoadBalancingPolicy#select(int)} chooses a the initial node randomly then subsequent requests return the same node
 */
public final class RandomStickyConnectionLoadBalancingPolicy implements ConnectionLoadBalancingPolicy {

   private int pos = -1;

   /**
    * @see java.util.Random#nextInt(int)
    */
   @Override
   public int select(final int max) {
      if (pos == -1) {
         pos = RandomUtil.randomInterval(0, max);
      }

      return pos;
   }
}