com.alibaba.rocketmq.client.consumer.rebalance.AllocateMessageQueueByMachineRoom Maven / Gradle / Ivy

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/**
 * Copyright (C) 2010-2013 Alibaba Group Holding Limited
 * 
 * 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.
 */
package com.alibaba.rocketmq.client.consumer.rebalance;

import com.alibaba.rocketmq.client.consumer.AllocateMessageQueueStrategy;
import com.alibaba.rocketmq.common.message.MessageQueue;

import java.util.ArrayList;
import java.util.List;
import java.util.Set;


/**
 * Computer room Hashing queue algorithm, such as Alipay logic room
 *
 * @author linye
 * @since 2013-7-24
 */
public class AllocateMessageQueueByMachineRoom implements AllocateMessageQueueStrategy {
    private Set consumeridcs;

    @Override
    public List allocate(String consumerGroup, String currentCID, List mqAll,
                                       List cidAll) {
        List result = new ArrayList();
        int currentIndex = cidAll.indexOf(currentCID);
        if (currentIndex < 0) {
            return result;
        }
        List premqAll = new ArrayList();
        for (MessageQueue mq : mqAll) {
            String[] temp = mq.getBrokerName().split("@");
            if (temp.length == 2 && consumeridcs.contains(temp[0])) {
                premqAll.add(mq);
            }
        }
        // Todo cid
        int mod = premqAll.size() / cidAll.size();
        int rem = premqAll.size() % cidAll.size();
        int startindex = mod * currentIndex;
        int endindex = startindex + mod;
        for (int i = startindex; i < endindex; i++) {
            result.add(mqAll.get(i));
        }
        if (rem > currentIndex) {
            result.add(premqAll.get(currentIndex + mod * cidAll.size()));
        }
        return result;
    }

    @Override
    public String getName() {
        return "MACHINE_ROOM";
    }

    public Set getConsumeridcs() {
        return consumeridcs;
    }


    public void setConsumeridcs(Set consumeridcs) {
        this.consumeridcs = consumeridcs;
    }
}