DefaultTransactionCheckExecuter.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.broker.transaction;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.alibaba.rocketmq.broker.BrokerController;
import com.alibaba.rocketmq.broker.client.ClientChannelInfo;
import com.alibaba.rocketmq.common.constant.LoggerName;
import com.alibaba.rocketmq.common.protocol.header.CheckTransactionStateRequestHeader;
import com.alibaba.rocketmq.store.SelectMapedBufferResult;
import com.alibaba.rocketmq.store.transaction.TransactionCheckExecuter;


/**
 * 存储层回调此接口，用来主动回查Producer的事务状态
 * 
 * @author shijia.wxr<vintage.wang@gmail.com>
 * @since 2013-7-26
 */
public class DefaultTransactionCheckExecuter implements TransactionCheckExecuter {
    private static final Logger log = LoggerFactory.getLogger(LoggerName.BrokerLoggerName);
    private final BrokerController brokerController;


    public DefaultTransactionCheckExecuter(final BrokerController brokerController) {
        this.brokerController = brokerController;
    }


    @Override
    public void gotoCheck(int producerGroupHashCode, long tranStateTableOffset, long commitLogOffset,
            int msgSize) {
        // 第一步、查询Producer
        final ClientChannelInfo clientChannelInfo =
                this.brokerController.getProducerManager().pickProducerChannelRandomly(producerGroupHashCode);
        if (null == clientChannelInfo) {
            log.warn("check a producer transaction state, but not find any channel of this group[{}]",
                producerGroupHashCode);
            return;
        }

        // 第二步、查询消息
        SelectMapedBufferResult selectMapedBufferResult =
                this.brokerController.getMessageStore().selectOneMessageByOffset(commitLogOffset, msgSize);
        if (null == selectMapedBufferResult) {
            log.warn(
                "check a producer transaction state, but not find message by commitLogOffset: {}, msgSize: ",
                commitLogOffset, msgSize);
            return;
        }

        // 第三步、向Producer发起请求
        final CheckTransactionStateRequestHeader requestHeader = new CheckTransactionStateRequestHeader();
        requestHeader.setCommitLogOffset(commitLogOffset);
        requestHeader.setTranStateTableOffset(tranStateTableOffset);
        this.brokerController.getBroker2Client().checkProducerTransactionState(
            clientChannelInfo.getChannel(), requestHeader, selectMapedBufferResult);
    }
}