/**
* 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;
import io.netty.channel.ChannelHandlerContext;
import java.nio.ByteBuffer;
import java.util.HashMap;
import java.util.Map;
import org.slf4j.Logger;
import com.alibaba.rocketmq.client.impl.factory.MQClientInstance;
import com.alibaba.rocketmq.client.impl.producer.MQProducerInner;
import com.alibaba.rocketmq.client.log.ClientLogger;
import com.alibaba.rocketmq.common.message.MessageConst;
import com.alibaba.rocketmq.common.message.MessageDecoder;
import com.alibaba.rocketmq.common.message.MessageExt;
import com.alibaba.rocketmq.common.message.MessageQueue;
import com.alibaba.rocketmq.common.protocol.RequestCode;
import com.alibaba.rocketmq.common.protocol.ResponseCode;
import com.alibaba.rocketmq.common.protocol.body.ConsumeMessageDirectlyResult;
import com.alibaba.rocketmq.common.protocol.body.ConsumerRunningInfo;
import com.alibaba.rocketmq.common.protocol.body.GetConsumerStatusBody;
import com.alibaba.rocketmq.common.protocol.body.ResetOffsetBody;
import com.alibaba.rocketmq.common.protocol.header.CheckTransactionStateRequestHeader;
import com.alibaba.rocketmq.common.protocol.header.ConsumeMessageDirectlyResultRequestHeader;
import com.alibaba.rocketmq.common.protocol.header.GetConsumerRunningInfoRequestHeader;
import com.alibaba.rocketmq.common.protocol.header.GetConsumerStatusRequestHeader;
import com.alibaba.rocketmq.common.protocol.header.NotifyConsumerIdsChangedRequestHeader;
import com.alibaba.rocketmq.common.protocol.header.ResetOffsetRequestHeader;
import com.alibaba.rocketmq.remoting.common.RemotingHelper;
import com.alibaba.rocketmq.remoting.exception.RemotingCommandException;
import com.alibaba.rocketmq.remoting.netty.NettyRequestProcessor;
import com.alibaba.rocketmq.remoting.protocol.RemotingCommand;
/**
* Client接收Broker的回调操作，例如事务回调，或者其他管理类命令回调
*
* @author shijia.wxr<vintage.wang@gmail.com>
* @since 2013-7-24
*/
public class ClientRemotingProcessor implements NettyRequestProcessor {
private final Logger log = ClientLogger.getLog();
private final MQClientInstance mqClientFactory;
public ClientRemotingProcessor(final MQClientInstance mqClientFactory) {
this.mqClientFactory = mqClientFactory;
}
@Override
public RemotingCommand processRequest(ChannelHandlerContext ctx, RemotingCommand request)
throws RemotingCommandException {
switch (request.getCode()) {
case RequestCode.CHECK_TRANSACTION_STATE:
return this.checkTransactionState(ctx, request);
case RequestCode.NOTIFY_CONSUMER_IDS_CHANGED:
return this.notifyConsumerIdsChanged(ctx, request);
case RequestCode.RESET_CONSUMER_CLIENT_OFFSET:
return this.resetOffset(ctx, request);
case RequestCode.GET_CONSUMER_STATUS_FROM_CLIENT:
return this.getConsumeStatus(ctx, request);
case RequestCode.GET_CONSUMER_RUNNING_INFO:
return this.getConsumerRunningInfo(ctx, request);
case RequestCode.CONSUME_MESSAGE_DIRECTLY:
return this.consumeMessageDirectly(ctx, request);
default:
break;
}
return null;
}
private RemotingCommand consumeMessageDirectly(ChannelHandlerContext ctx, RemotingCommand request)
throws RemotingCommandException {
final RemotingCommand response = RemotingCommand.createResponseCommand(null);
final ConsumeMessageDirectlyResultRequestHeader requestHeader =
(ConsumeMessageDirectlyResultRequestHeader) request
.decodeCommandCustomHeader(ConsumeMessageDirectlyResultRequestHeader.class);
final MessageExt msg = MessageDecoder.decode(ByteBuffer.wrap(request.getBody()));
ConsumeMessageDirectlyResult result =
this.mqClientFactory.consumeMessageDirectly(msg, requestHeader.getConsumerGroup(),
requestHeader.getBrokerName());
if (null != result) {
response.setCode(ResponseCode.SUCCESS);
response.setBody(result.encode());
}
else {
response.setCode(ResponseCode.SYSTEM_ERROR);
response.setRemark(String.format("The Consumer Group <%s> not exist in this consumer",
requestHeader.getConsumerGroup()));
}
return response;
}
private RemotingCommand getConsumerRunningInfo(ChannelHandlerContext ctx, RemotingCommand request)
throws RemotingCommandException {
final RemotingCommand response = RemotingCommand.createResponseCommand(null);
final GetConsumerRunningInfoRequestHeader requestHeader =
(GetConsumerRunningInfoRequestHeader) request
.decodeCommandCustomHeader(GetConsumerRunningInfoRequestHeader.class);
ConsumerRunningInfo consumerRunningInfo =
this.mqClientFactory.consumerRunningInfo(requestHeader.getConsumerGroup());
if (null != consumerRunningInfo) {
response.setCode(ResponseCode.SUCCESS);
response.setBody(consumerRunningInfo.encode());
}
else {
response.setCode(ResponseCode.SYSTEM_ERROR);
response.setRemark(String.format("The Consumer Group <%s> not exist in this consumer",
requestHeader.getConsumerGroup()));
}
return response;
}
/**
* Oneway调用，无返回值
*/
public RemotingCommand checkTransactionState(ChannelHandlerContext ctx, RemotingCommand request)
throws RemotingCommandException {
final CheckTransactionStateRequestHeader requestHeader =
(CheckTransactionStateRequestHeader) request
.decodeCommandCustomHeader(CheckTransactionStateRequestHeader.class);
final ByteBuffer byteBuffer = ByteBuffer.wrap(request.getBody());
final MessageExt messageExt = MessageDecoder.decode(byteBuffer);
if (messageExt != null) {
final String group = messageExt.getProperty(MessageConst.PROPERTY_PRODUCER_GROUP);
if (group != null) {
MQProducerInner producer = this.mqClientFactory.selectProducer(group);
if (producer != null) {
final String addr = RemotingHelper.parseChannelRemoteAddr(ctx.channel());
producer.checkTransactionState(addr, messageExt, requestHeader);
}
else {
log.debug("checkTransactionState, pick producer by group[{}] failed", group);
}
}
else {
log.warn("checkTransactionState, pick producer group failed");
}
}
else {
log.warn("checkTransactionState, decode message failed");
}
return null;
}
/**
* Oneway调用，无返回值
*/
public RemotingCommand notifyConsumerIdsChanged(ChannelHandlerContext ctx, RemotingCommand request)
throws RemotingCommandException {
try {
final NotifyConsumerIdsChangedRequestHeader requestHeader =
(NotifyConsumerIdsChangedRequestHeader) request
.decodeCommandCustomHeader(NotifyConsumerIdsChangedRequestHeader.class);
log.info(
"receive broker's notification[{}], the consumer group: {} changed, rebalance immediately",//
RemotingHelper.parseChannelRemoteAddr(ctx.channel()),//
requestHeader.getConsumerGroup());
this.mqClientFactory.rebalanceImmediately();
}
catch (Exception e) {
log.error("notifyConsumerIdsChanged exception", RemotingHelper.exceptionSimpleDesc(e));
}
return null;
}
/**
* 重置 offset， oneWay调用，无返回值。
*/
public RemotingCommand resetOffset(ChannelHandlerContext ctx, RemotingCommand request)
throws RemotingCommandException {
final ResetOffsetRequestHeader requestHeader =
(ResetOffsetRequestHeader) request.decodeCommandCustomHeader(ResetOffsetRequestHeader.class);
log.info(
"invoke reset offset operation from broker. brokerAddr={}, topic={}, group={}, timestamp={}",
new Object[] { RemotingHelper.parseChannelRemoteAddr(ctx.channel()), requestHeader.getTopic(),
requestHeader.getGroup(), requestHeader.getTimestamp() });
Map<MessageQueue, Long> offsetTable = new HashMap<MessageQueue, Long>();
if (request.getBody() != null) {
ResetOffsetBody body = ResetOffsetBody.decode(request.getBody(), ResetOffsetBody.class);
offsetTable = body.getOffsetTable();
}
this.mqClientFactory.resetOffset(requestHeader.getTopic(), requestHeader.getGroup(), offsetTable);
return null;
}
/**
* 获取 consumer 消息消费状态。
*/
@Deprecated
public RemotingCommand getConsumeStatus(ChannelHandlerContext ctx, RemotingCommand request)
throws RemotingCommandException {
final RemotingCommand response = RemotingCommand.createResponseCommand(null);
final GetConsumerStatusRequestHeader requestHeader =
(GetConsumerStatusRequestHeader) request
.decodeCommandCustomHeader(GetConsumerStatusRequestHeader.class);
Map<MessageQueue, Long> offsetTable =
this.mqClientFactory.getConsumerStatus(requestHeader.getTopic(), requestHeader.getGroup());
GetConsumerStatusBody body = new GetConsumerStatusBody();
body.setMessageQueueTable(offsetTable);
response.setBody(body.encode());
response.setCode(ResponseCode.SUCCESS);
return response;
}
}