RebalanceService.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.impl.consumer;

import org.slf4j.Logger;

import com.alibaba.rocketmq.client.impl.factory.MQClientFactory;
import com.alibaba.rocketmq.client.log.ClientLogger;
import com.alibaba.rocketmq.common.ServiceThread;


/**
 * Rebalance服务
 * 
 * <br/>
 * chen.si 主要负责对每个consumer group，定期检查 group包含的 活动consumer 是否有变化，以及时更新 consumer处理的分区队列
 * 
 * @author shijia.wxr<vintage.wang@gmail.com>
 * @since 2013-7-24
 */
public class RebalanceService extends ServiceThread {
    private final Logger log = ClientLogger.getLog();
    private final MQClientFactory mqClientFactory;


    public RebalanceService(MQClientFactory mqClientFactory) {
        this.mqClientFactory = mqClientFactory;
    }

    private static long WaitInterval = 1000 * 10;


    @Override
    public void run() {
        log.info(this.getServiceName() + " service started");

        while (!this.isStoped()) {
            this.waitForRunning(WaitInterval);
            this.mqClientFactory.doRebalance();
        }

        log.info(this.getServiceName() + " service end");
    }


    @Override
    public String getServiceName() {
        return RebalanceService.class.getSimpleName();
    }
}