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com.alibaba.rocketmq.common.message.MessageDecoder Maven / Gradle / Ivy
/**
* 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.common.message;
import com.alibaba.rocketmq.common.UtilAll;
import com.alibaba.rocketmq.common.sysflag.MessageSysFlag;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.SocketAddress;
import java.net.UnknownHostException;
import java.nio.BufferUnderflowException;
import java.nio.ByteBuffer;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* 消息解码
*
* @author shijia.wxr
*/
public class MessageDecoder {
/**
* 消息ID定长, 此长度任意增加可能会导致MessageClientIDSetter.isUniqID判断错误
*/
public final static int MSG_ID_LENGTH = 8 + 8;
public final static Charset CHARSET_UTF8 = Charset.forName("UTF-8");
/**
* 存储记录各个字段位置
*/
public final static int MessageMagicCodePostion = 4;
public final static int MessageFlagPostion = 16;
public final static int MessagePhysicOffsetPostion = 28;
public final static int MessageStoreTimestampPostion = 56;
public final static int MessageMagicCode = 0xAABBCCDD ^ 1880681586 + 8;
public static String createMessageId(final ByteBuffer input, final ByteBuffer addr, final long offset) {
input.flip();
input.limit(MessageDecoder.MSG_ID_LENGTH);
// 消息存储主机地址 IP PORT 8
input.put(addr);
// 消息对应的物理分区 OFFSET 8
input.putLong(offset);
return UtilAll.bytes2string(input.array());
}
public static String createMessageId(SocketAddress socketAddress, long transactionIdhashCode) {
ByteBuffer byteBuffer = ByteBuffer.allocate(MessageDecoder.MSG_ID_LENGTH);
InetSocketAddress inetSocketAddress = (InetSocketAddress) socketAddress;
byteBuffer.put(inetSocketAddress.getAddress().getAddress());
byteBuffer.putInt(inetSocketAddress.getPort());
byteBuffer.putLong(transactionIdhashCode);
byteBuffer.flip();
return UtilAll.bytes2string(byteBuffer.array());
}
public static MessageId decodeMessageId(final String msgId) throws UnknownHostException {
SocketAddress address;
long offset;
// 地址
byte[] ip = UtilAll.string2bytes(msgId.substring(0, 8));
byte[] port = UtilAll.string2bytes(msgId.substring(8, 16));
ByteBuffer bb = ByteBuffer.wrap(port);
int portInt = bb.getInt(0);
address = new InetSocketAddress(InetAddress.getByAddress(ip), portInt);
// offset
byte[] data = UtilAll.string2bytes(msgId.substring(16, 32));
bb = ByteBuffer.wrap(data);
offset = bb.getLong(0);
return new MessageId(address, offset);
}
public static MessageExt decode(java.nio.ByteBuffer byteBuffer) {
return decode(byteBuffer, true, true, false);
}
/**
* 客户端使用
*/
public static MessageExt clientDecode(java.nio.ByteBuffer byteBuffer, final boolean readBody) {
return decode(byteBuffer, readBody, true, true);
}
/**
* SLAVE使用
*/
public static MessageExt decode(java.nio.ByteBuffer byteBuffer, final boolean readBody) {
return decode(byteBuffer, readBody, true, false);
}
// 当前该方法没有用到
public static byte[] encode(MessageExt messageExt, boolean needCompress) throws Exception {
byte[] body = messageExt.getBody();
byte[] topics = messageExt.getTopic().getBytes(CHARSET_UTF8);
byte topicLen = (byte) topics.length;
String properties = messageProperties2String(messageExt.getProperties());
byte[] propertiesBytes = properties.getBytes(CHARSET_UTF8);
short propertiesLength = (short) propertiesBytes.length;
int sysFlag = messageExt.getSysFlag();
byte[] newBody = messageExt.getBody();
if (needCompress && (sysFlag & MessageSysFlag.CompressedFlag) == MessageSysFlag.CompressedFlag) {
newBody = UtilAll.compress(body, 5);
}
int bodyLength = newBody.length;
int storeSize = messageExt.getStoreSize();
ByteBuffer byteBuffer;
if (storeSize > 0) {
byteBuffer = ByteBuffer.allocate(storeSize);
} else {
storeSize = 4 // 1 TOTALSIZE
+ 4 // 2 MAGICCODE
+ 4 // 3 BODYCRC
+ 4 // 4 QUEUEID
+ 4 // 5 FLAG
+ 8 // 6 QUEUEOFFSET
+ 8 // 7 PHYSICALOFFSET
+ 4 // 8 SYSFLAG
+ 8 // 9 BORNTIMESTAMP
+ 8 // 10 BORNHOST
+ 8 // 11 STORETIMESTAMP
+ 8 // 12 STOREHOSTADDRESS
+ 4 // 13 RECONSUMETIMES
+ 8 // 14 Prepared Transaction Offset
+ 4 + bodyLength // 14 BODY
+ 1 + topicLen // 15 TOPIC
+ 2 + propertiesLength // 16 propertiesLength
+ 0;
byteBuffer = ByteBuffer.allocate(storeSize);
}
// 1 TOTALSIZE
byteBuffer.putInt(storeSize);
// 2 MAGICCODE
byteBuffer.putInt(MessageMagicCode);
// 3 BODYCRC
int bodyCRC = messageExt.getBodyCRC();
byteBuffer.putInt(bodyCRC);
// 4 QUEUEID
int queueId = messageExt.getQueueId();
byteBuffer.putInt(queueId);
// 5 FLAG
int flag = messageExt.getFlag();
byteBuffer.putInt(flag);
// 6 QUEUEOFFSET
long queueOffset = messageExt.getQueueOffset();
byteBuffer.putLong(queueOffset);
// 7 PHYSICALOFFSET
long physicOffset = messageExt.getCommitLogOffset();
byteBuffer.putLong(physicOffset);
// 8 SYSFLAG
byteBuffer.putInt(sysFlag);
// 9 BORNTIMESTAMP
long bornTimeStamp = messageExt.getBornTimestamp();
byteBuffer.putLong(bornTimeStamp);
// 10 BORNHOST
InetSocketAddress bornHost = (InetSocketAddress) messageExt.getBornHost();
byteBuffer.put(bornHost.getAddress().getAddress());
byteBuffer.putInt(bornHost.getPort());
// 11 STORETIMESTAMP
long storeTimestamp = messageExt.getStoreTimestamp();
byteBuffer.putLong(storeTimestamp);
// 12 STOREHOST
InetSocketAddress serverHost = (InetSocketAddress) messageExt.getStoreHost();
byteBuffer.put(serverHost.getAddress().getAddress());
byteBuffer.putInt(serverHost.getPort());
// 13 RECONSUMETIMES
int reconsumeTimes = messageExt.getReconsumeTimes();
byteBuffer.putInt(reconsumeTimes);
// 14 Prepared Transaction Offset
long preparedTransactionOffset = messageExt.getPreparedTransactionOffset();
byteBuffer.putLong(preparedTransactionOffset);
// 15 BODY
byteBuffer.putInt(bodyLength);
byteBuffer.put(newBody);
// 16 TOPIC
byteBuffer.put(topicLen);
byteBuffer.put(topics);
// 17 properties
byteBuffer.putShort(propertiesLength);
byteBuffer.put(propertiesBytes);
return byteBuffer.array();
}
public static MessageExt decode(
java.nio.ByteBuffer byteBuffer, final boolean readBody, final boolean deCompressBody) {
return decode(byteBuffer, readBody, deCompressBody, false);
}
public static MessageExt decode(
java.nio.ByteBuffer byteBuffer, final boolean readBody, final boolean deCompressBody, final boolean isClient) {
try {
MessageExt msgExt;
if (isClient) {
msgExt = new MessageClientExt();
}
else {
msgExt = new MessageExt();
}
// 1 TOTALSIZE
int storeSize = byteBuffer.getInt();
msgExt.setStoreSize(storeSize);
// 2 MAGICCODE
byteBuffer.getInt();
// 3 BODYCRC
int bodyCRC = byteBuffer.getInt();
msgExt.setBodyCRC(bodyCRC);
// 4 QUEUEID
int queueId = byteBuffer.getInt();
msgExt.setQueueId(queueId);
// 5 FLAG
int flag = byteBuffer.getInt();
msgExt.setFlag(flag);
// 6 QUEUEOFFSET
long queueOffset = byteBuffer.getLong();
msgExt.setQueueOffset(queueOffset);
// 7 PHYSICALOFFSET
long physicOffset = byteBuffer.getLong();
msgExt.setCommitLogOffset(physicOffset);
// 8 SYSFLAG
int sysFlag = byteBuffer.getInt();
msgExt.setSysFlag(sysFlag);
// 9 BORNTIMESTAMP
long bornTimeStamp = byteBuffer.getLong();
msgExt.setBornTimestamp(bornTimeStamp);
// 10 BORNHOST
byte[] bornHost = new byte[4];
byteBuffer.get(bornHost, 0, 4);
int port = byteBuffer.getInt();
msgExt.setBornHost(new InetSocketAddress(InetAddress.getByAddress(bornHost), port));
// 11 STORETIMESTAMP
long storeTimestamp = byteBuffer.getLong();
msgExt.setStoreTimestamp(storeTimestamp);
// 12 STOREHOST
byte[] storeHost = new byte[4];
byteBuffer.get(storeHost, 0, 4);
port = byteBuffer.getInt();
msgExt.setStoreHost(new InetSocketAddress(InetAddress.getByAddress(storeHost), port));
// 13 RECONSUMETIMES
int reconsumeTimes = byteBuffer.getInt();
msgExt.setReconsumeTimes(reconsumeTimes);
// 14 Prepared Transaction Offset
long preparedTransactionOffset = byteBuffer.getLong();
msgExt.setPreparedTransactionOffset(preparedTransactionOffset);
// 15 BODY
int bodyLen = byteBuffer.getInt();
if (bodyLen > 0) {
if (readBody) {
byte[] body = new byte[bodyLen];
byteBuffer.get(body);
// uncompress body
if (deCompressBody && (sysFlag & MessageSysFlag.CompressedFlag) == MessageSysFlag.CompressedFlag) {
body = UtilAll.uncompress(body);
}
msgExt.setBody(body);
}
else {
byteBuffer.position(byteBuffer.position() + bodyLen);
}
}
// 16 TOPIC
byte topicLen = byteBuffer.get();
byte[] topic = new byte[(int) topicLen];
byteBuffer.get(topic);
msgExt.setTopic(new String(topic, CHARSET_UTF8));
// 17 properties
short propertiesLength = byteBuffer.getShort();
if (propertiesLength > 0) {
byte[] properties = new byte[propertiesLength];
byteBuffer.get(properties);
String propertiesString = new String(properties, CHARSET_UTF8);
Map map = string2messageProperties(propertiesString);
msgExt.setProperties(map);
}
// 消息ID
ByteBuffer byteBufferMsgId = ByteBuffer.allocate(MSG_ID_LENGTH);
String msgId = createMessageId(byteBufferMsgId, msgExt.getStoreHostBytes(), msgExt.getCommitLogOffset());
msgExt.setMsgId(msgId);
if (isClient) {
//虽然也可以在MessageClientExt里面封装，当setMsgId时就是setOffsetMsgId，
//但这样做MessageClientExt的逻辑会和外部耦合
((MessageClientExt)msgExt).setOffsetMsgId(msgId);
}
return msgExt;
}
catch (UnknownHostException e) {
byteBuffer.position(byteBuffer.limit());
}
catch (BufferUnderflowException e) {
byteBuffer.position(byteBuffer.limit());
}
catch (Exception e) {
byteBuffer.position(byteBuffer.limit());
}
return null;
}
public static List decodes(java.nio.ByteBuffer byteBuffer) {
return decodes(byteBuffer, true);
}
/**
* 客户端使用
*/
public static List decodes(java.nio.ByteBuffer byteBuffer, final boolean readBody) {
List msgExts = new ArrayList();
while (byteBuffer.hasRemaining()) {
MessageExt msgExt = clientDecode(byteBuffer, readBody);
if (null != msgExt) {
msgExts.add(msgExt);
}
else {
break;
}
}
return msgExts;
}
/**
* 序列化消息属性
*/
public static final char NAME_VALUE_SEPARATOR = 1;
public static final char PROPERTY_SEPARATOR = 2;
public static String messageProperties2String(Map properties) {
StringBuilder sb = new StringBuilder();
if (properties != null) {
for (final Map.Entry entry : properties.entrySet()) {
final String name = entry.getKey();
final String value = entry.getValue();
sb.append(name);
sb.append(NAME_VALUE_SEPARATOR);
sb.append(value);
sb.append(PROPERTY_SEPARATOR);
}
}
return sb.toString();
}
public static Map string2messageProperties(final String properties) {
Map map = new HashMap();
if (properties != null) {
String[] items = properties.split(String.valueOf(PROPERTY_SEPARATOR));
if (items != null) {
for (String i : items) {
String[] nv = i.split(String.valueOf(NAME_VALUE_SEPARATOR));
if (nv != null && 2 == nv.length) {
map.put(nv[0], nv[1]);
}
}
}
}
return map;
}
}
