AllocateMessageQueueByMachineRoom.java

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

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


/**
 * 按照机房来分配队列，例如支付宝逻辑机房
 * 
 * @author linye<jin.qian@alipay.com>
 * @since 2013-7-24
 */
public class AllocateMessageQueueByMachineRoom implements AllocateMessageQueueStrategy {
    private Set<String> consumeridcs;


    @Override
    public List<MessageQueue> allocate(String currentCID, List<MessageQueue> mqAll, List<String> cidAll) {
        List<MessageQueue> result = new ArrayList<MessageQueue>();
        int currentIndex = cidAll.indexOf(currentCID);
        if (currentIndex < 0) {
            return result;
        }
        List<MessageQueue> premqAll = new ArrayList<MessageQueue>();
        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;
    }


    public Set<String> getConsumeridcs() {
        return consumeridcs;
    }


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