com.alibaba.dts.client.route.impl.RandomRule Maven / Gradle / Ivy

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package com.alibaba.dts.client.route.impl;

import java.util.List;
import java.util.Random;

import com.alibaba.dts.client.executor.job.context.JobContext;
import com.alibaba.dts.client.route.RouteRule;
import com.alibaba.dts.common.domain.remoting.RemoteMachine;

/**
 * 随机路由规则
 *
 * @author Ronan Zhan
 */
public class RandomRule implements RouteRule {

    /**
     * 随机生成数字
     */
    private Random random = new Random();

    @Override
    public RemoteMachine rule(JobContext jobContext, List machines) {

        if (null == machines || machines.isEmpty()) {
            return null;
        }

        //生成随机下标
        int index = random.nextInt() % machines.size();

        return machines.get(Math.abs(index));
    }

}