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/*
 * Copyright (c) 2020-2030, Shuigedeng ([email protected] & https://blog.taotaocloud.top/).
 *
 * 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
 *
 *      https://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 com.taotao.cloud.openfeign.loadbalancer.chooser;

import com.taotao.cloud.common.utils.collection.CollectionUtils;
import com.taotao.cloud.common.utils.log.LogUtils;
import java.util.List;
import java.util.concurrent.ThreadLocalRandom;
import org.springframework.cloud.client.ServiceInstance;

/**
 * 随机的选择器
 *
 * @author shuigedeng
 * @version 2022.06
 * @since 2022-06-08 10:42:37
 */
public class RandomRuleChooser implements IRuleChooser {

    @Override
    public ServiceInstance choose(List instances) {
        if (CollectionUtils.isNotEmpty(instances)) {
            int randomValue = ThreadLocalRandom.current().nextInt(instances.size());
            ServiceInstance serviceInstance = instances.get(randomValue);
            LogUtils.info(
                    "RandomRuleChooser 选择了ip为 {}, 端口为：{} 的服务", serviceInstance.getHost(), serviceInstance.getPort());
            return serviceInstance;
        }
        return null;
    }
}