org.apache.activemq.artemis.api.core.client.loadbalance.RoundRobinConnectionLoadBalancingPolicy Maven / Gradle / Ivy
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* 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 java.io.Serializable;
import org.apache.activemq.artemis.utils.RandomUtil;
/**
* RoundRobinConnectionLoadBalancingPolicy corresponds to a round-robin load-balancing policy.
*
*
* The first call to {@link #select(int)} will return a random integer between {@code 0} (inclusive) and {@code max} (exclusive).
* Subsequent calls will then return an integer in a round-robin fashion.
*/
public final class RoundRobinConnectionLoadBalancingPolicy implements ConnectionLoadBalancingPolicy, Serializable {
private static final long serialVersionUID = 7511196010141439559L;
private boolean first = true;
private int pos;
@Override
public int select(final int max) {
if (first) {
// We start on a random one
pos = RandomUtil.randomInterval(0, max);
first = false;
} else {
pos++;
if (pos >= max) {
pos = 0;
}
}
return pos;
}
}