RebalancePullImpl.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 java.util.List;
import java.util.Set;

import com.alibaba.rocketmq.client.consumer.AllocateMessageQueueStrategy;
import com.alibaba.rocketmq.client.consumer.MessageQueueListener;
import com.alibaba.rocketmq.client.impl.factory.MQClientFactory;
import com.alibaba.rocketmq.common.message.MessageQueue;
import com.alibaba.rocketmq.common.protocol.heartbeat.MessageModel;


/**
 * @author shijia.wxr<vintage.wang@gmail.com>
 * @since 2013-6-22
 */
public class RebalancePullImpl extends RebalanceImpl {
    private final DefaultMQPullConsumerImpl defaultMQPullConsumerImpl;


    public RebalancePullImpl(DefaultMQPullConsumerImpl defaultMQPullConsumerImpl) {
        this(null, null, null, null, defaultMQPullConsumerImpl);
    }


    public RebalancePullImpl(String consumerGroup, MessageModel messageModel,
            AllocateMessageQueueStrategy allocateMessageQueueStrategy, MQClientFactory mQClientFactory,
            DefaultMQPullConsumerImpl defaultMQPullConsumerImpl) {
        super(consumerGroup, messageModel, allocateMessageQueueStrategy, mQClientFactory);
        this.defaultMQPullConsumerImpl = defaultMQPullConsumerImpl;
    }


    @Override
    public long computePullFromWhere(MessageQueue mq) {
        return 0;
    }


    @Override
    public void dispatchPullRequest(List<PullRequest> pullRequestList) {
    }


    @Override
    public void messageQueueChanged(String topic, Set<MessageQueue> mqAll, Set<MessageQueue> mqDivided) {
        MessageQueueListener messageQueueListener =
                this.defaultMQPullConsumerImpl.getDefaultMQPullConsumer().getMessageQueueListener();
        if (messageQueueListener != null) {
            try {
                messageQueueListener.messageQueueChanged(topic, mqAll, mqDivided);
            }
            catch (Throwable e) {
                log.error("messageQueueChanged exception", e);
            }
        }
    }


    @Override
    public void removeUnnecessaryMessageQueue(MessageQueue mq, ProcessQueue pq) {
        this.defaultMQPullConsumerImpl.getOffsetStore().persist(mq);
        this.defaultMQPullConsumerImpl.getOffsetStore().removeOffset(mq);
    }
}