org.rapidoid.reverseproxy.RoundRobinLoadBalancer Maven / Gradle / Ivy
/*-
* #%L
* rapidoid-http-server
* %%
* Copyright (C) 2014 - 2018 Nikolche Mihajlovski and contributors
* %%
* 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.
* #L%
*/
package org.rapidoid.reverseproxy;
import org.rapidoid.RapidoidThing;
import org.rapidoid.annotation.Authors;
import org.rapidoid.annotation.Since;
import org.rapidoid.http.Req;
import java.util.List;
import java.util.concurrent.atomic.AtomicLong;
@Authors("Nikolche Mihajlovski")
@Since("5.2.0")
public class RoundRobinLoadBalancer extends RapidoidThing implements LoadBalancer {
private final AtomicLong counter = new AtomicLong();
@Override
public ProxyUpstream pickUpstream(Req req, List candidates) {
long n = counter.getAndIncrement();
int index = (int) (n % candidates.size());
return candidates.get(index);
}
}