org.apache.rocketmq.broker.processor.QueryMessageProcessor.java Source code

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Here is the source code for org.apache.rocketmq.broker.processor.QueryMessageProcessor.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.rocketmq.broker.processor;

import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.FileRegion;
import org.apache.rocketmq.broker.BrokerController;
import org.apache.rocketmq.broker.pagecache.OneMessageTransfer;
import org.apache.rocketmq.broker.pagecache.QueryMessageTransfer;
import org.apache.rocketmq.common.MixAll;
import org.apache.rocketmq.common.constant.LoggerName;
import org.apache.rocketmq.common.protocol.RequestCode;
import org.apache.rocketmq.common.protocol.ResponseCode;
import org.apache.rocketmq.common.protocol.header.QueryMessageRequestHeader;
import org.apache.rocketmq.common.protocol.header.QueryMessageResponseHeader;
import org.apache.rocketmq.common.protocol.header.ViewMessageRequestHeader;
import org.apache.rocketmq.remoting.exception.RemotingCommandException;
import org.apache.rocketmq.remoting.netty.NettyRequestProcessor;
import org.apache.rocketmq.remoting.protocol.RemotingCommand;
import org.apache.rocketmq.store.QueryMessageResult;
import org.apache.rocketmq.store.SelectMappedBufferResult;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class QueryMessageProcessor implements NettyRequestProcessor {
    private static final Logger log = LoggerFactory.getLogger(LoggerName.BROKER_LOGGER_NAME);

    private final BrokerController brokerController;

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

    @Override
    public RemotingCommand processRequest(ChannelHandlerContext ctx, RemotingCommand request)
            throws RemotingCommandException {
        switch (request.getCode()) {
        case RequestCode.QUERY_MESSAGE:
            return this.queryMessage(ctx, request);
        case RequestCode.VIEW_MESSAGE_BY_ID:
            return this.viewMessageById(ctx, request);
        default:
            break;
        }

        return null;
    }

    @Override
    public boolean rejectRequest() {
        return false;
    }

    public RemotingCommand queryMessage(ChannelHandlerContext ctx, RemotingCommand request)
            throws RemotingCommandException {
        final RemotingCommand response = RemotingCommand.createResponseCommand(QueryMessageResponseHeader.class);
        final QueryMessageResponseHeader responseHeader = (QueryMessageResponseHeader) response.readCustomHeader();
        final QueryMessageRequestHeader requestHeader = (QueryMessageRequestHeader) request
                .decodeCommandCustomHeader(QueryMessageRequestHeader.class);

        response.setOpaque(request.getOpaque());

        String isUniqueKey = request.getExtFields().get(MixAll.UNIQUE_MSG_QUERY_FLAG);
        if (isUniqueKey != null && isUniqueKey.equals("true")) {
            requestHeader.setMaxNum(this.brokerController.getMessageStoreConfig().getDefaultQueryMaxNum());
        }

        final QueryMessageResult queryMessageResult = this.brokerController.getMessageStore().queryMessage(
                requestHeader.getTopic(), requestHeader.getKey(), requestHeader.getMaxNum(),
                requestHeader.getBeginTimestamp(), requestHeader.getEndTimestamp());
        assert queryMessageResult != null;

        responseHeader.setIndexLastUpdatePhyoffset(queryMessageResult.getIndexLastUpdatePhyoffset());
        responseHeader.setIndexLastUpdateTimestamp(queryMessageResult.getIndexLastUpdateTimestamp());

        if (queryMessageResult.getBufferTotalSize() > 0) {
            response.setCode(ResponseCode.SUCCESS);
            response.setRemark(null);

            try {
                FileRegion fileRegion = new QueryMessageTransfer(
                        response.encodeHeader(queryMessageResult.getBufferTotalSize()), queryMessageResult);
                ctx.channel().writeAndFlush(fileRegion).addListener(new ChannelFutureListener() {
                    @Override
                    public void operationComplete(ChannelFuture future) throws Exception {
                        queryMessageResult.release();
                        if (!future.isSuccess()) {
                            log.error("transfer query message by page cache failed, ", future.cause());
                        }
                    }
                });
            } catch (Throwable e) {
                log.error("", e);
                queryMessageResult.release();
            }

            return null;
        }

        response.setCode(ResponseCode.QUERY_NOT_FOUND);
        response.setRemark("can not find message, maybe time range not correct");
        return response;
    }

    public RemotingCommand viewMessageById(ChannelHandlerContext ctx, RemotingCommand request)
            throws RemotingCommandException {
        final RemotingCommand response = RemotingCommand.createResponseCommand(null);
        final ViewMessageRequestHeader requestHeader = (ViewMessageRequestHeader) request
                .decodeCommandCustomHeader(ViewMessageRequestHeader.class);

        response.setOpaque(request.getOpaque());

        final SelectMappedBufferResult selectMappedBufferResult = this.brokerController.getMessageStore()
                .selectOneMessageByOffset(requestHeader.getOffset());
        if (selectMappedBufferResult != null) {
            response.setCode(ResponseCode.SUCCESS);
            response.setRemark(null);

            try {
                FileRegion fileRegion = new OneMessageTransfer(
                        response.encodeHeader(selectMappedBufferResult.getSize()), selectMappedBufferResult);
                ctx.channel().writeAndFlush(fileRegion).addListener(new ChannelFutureListener() {
                    @Override
                    public void operationComplete(ChannelFuture future) throws Exception {
                        selectMappedBufferResult.release();
                        if (!future.isSuccess()) {
                            log.error("Transfer one message from page cache failed, ", future.cause());
                        }
                    }
                });
            } catch (Throwable e) {
                log.error("", e);
                selectMappedBufferResult.release();
            }

            return null;
        } else {
            response.setCode(ResponseCode.SYSTEM_ERROR);
            response.setRemark("can not find message by the offset, " + requestHeader.getOffset());
        }

        return response;
    }
}