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Camel Cloud support (deprecated since 4.7)

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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.camel.impl.cloud;

import java.util.List;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

import org.apache.camel.cloud.ServiceChooser;
import org.apache.camel.cloud.ServiceDefinition;
import org.apache.camel.util.ObjectHelper;

/**
 * @deprecated since 4.7
 */
@Deprecated(since = "4.7")
public class RoundRobinServiceChooser implements ServiceChooser {
    private int counter = -1;
    private final Lock lock = new ReentrantLock();

    @Override
    public ServiceDefinition choose(List definitions) {
        lock.lock();
        try {
            // Fail if the service definition list is null or empty
            if (ObjectHelper.isEmpty(definitions)) {
                throw new IllegalArgumentException("The ServiceDefinition list should not be empty");
            }

            int size = definitions.size();
            if (size == 1 || ++counter >= size) {
                counter = 0;
            }

            return definitions.get(counter);
        } finally {
            lock.unlock();
        }
    }

    @Override
    public String toString() {
        return "RoundRobinServiceChooser";
    }
}