com.tencent.polaris.api.plugin.loadbalance.LoadBalancer Maven / Gradle / Ivy
/*
* Tencent is pleased to support the open source community by making Polaris available.
*
* Copyright (C) 2019 THL A29 Limited, a Tencent company. All rights reserved.
*
* Licensed under the BSD 3-Clause License (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://opensource.org/licenses/BSD-3-Clause
*
* 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.tencent.polaris.api.plugin.loadbalance;
import com.tencent.polaris.api.exception.PolarisException;
import com.tencent.polaris.api.plugin.Plugin;
import com.tencent.polaris.api.pojo.Instance;
import com.tencent.polaris.api.pojo.ServiceInstances;
import com.tencent.polaris.api.rpc.Criteria;
/**
* 【扩展点接口】负载均衡
*
* @author andrewshan
* @date 2019/8/21
*/
public interface LoadBalancer extends Plugin {
/**
* 进行负载均衡，选择一个实例
*
* @param criteria 负载均衡的关键因子
* @param instances 服务实例列表
* @return 单个服务实例
* @throws PolarisException SDK被销毁则抛出异常
*/
Instance chooseInstance(Criteria criteria, ServiceInstances instances) throws PolarisException;
}