/**
* 服务端使用 检查消息并返回消息大小
*
* @return 0 表示走到文件末尾 >0 正常消息 -1 消息校验失败
*/
public DispatchRequest checkMessageAndReturnSize(
java.nio.ByteBuffer byteBuffer, final boolean checkCRC, final boolean readBody) {
try {
java.nio.ByteBuffer byteBufferMessage =
((DefaultAppendMessageCallback) this.appendMessageCallback).getMsgStoreItemMemory();
byte[] bytesContent = byteBufferMessage.array();
// 1 TOTALSIZE
int totalSize = byteBuffer.getInt();
// 2 MAGICCODE
int magicCode = byteBuffer.getInt();
switch (magicCode) {
case MessageMagicCode:
break;
case BlankMagicCode:
return new DispatchRequest(0);
default:
log.warn("found a illegal magic code 0x" + Integer.toHexString(magicCode));
return new DispatchRequest(-1);
}
// 3 BODYCRC
int bodyCRC = byteBuffer.getInt();
// 4 QUEUEID
int queueId = byteBuffer.getInt();
// 5 FLAG
int flag = byteBuffer.getInt();
flag = flag + 0;
// 6 QUEUEOFFSET
long queueOffset = byteBuffer.getLong();
// 7 PHYSICALOFFSET
long physicOffset = byteBuffer.getLong();
// 8 SYSFLAG
int sysFlag = byteBuffer.getInt();
// 9 BORNTIMESTAMP
long bornTimeStamp = byteBuffer.getLong();
bornTimeStamp = bornTimeStamp + 0;
// 10 BORNHOST（IP+PORT）
byteBuffer.get(bytesContent, 0, 8);
// 11 STORETIMESTAMP
long storeTimestamp = byteBuffer.getLong();
// 12 STOREHOST（IP+PORT）
byteBuffer.get(bytesContent, 0, 8);
// 13 RECONSUMETIMES
int reconsumeTimes = byteBuffer.getInt();
// 14 Prepared Transaction Offset
long preparedTransactionOffset = byteBuffer.getLong();
// 15 BODY
int bodyLen = byteBuffer.getInt();
if (bodyLen > 0) {
if (readBody) {
byteBuffer.get(bytesContent, 0, bodyLen);
// 校验CRC
if (checkCRC) {
int crc = UtilAll.crc32(bytesContent, 0, bodyLen);
if (crc != bodyCRC) {
log.warn("CRC check failed " + crc + " " + bodyCRC);
return new DispatchRequest(-1);
}
}
} else {
byteBuffer.position(byteBuffer.position() + bodyLen);
}
}
// 16 TOPIC
byte topicLen = byteBuffer.get();
byteBuffer.get(bytesContent, 0, topicLen);
String topic = new String(bytesContent, 0, topicLen);
long tagsCode = 0;
String keys = "";
// 17 properties
short propertiesLength = byteBuffer.getShort();
if (propertiesLength > 0) {
byteBuffer.get(bytesContent, 0, propertiesLength);
String properties = new String(bytesContent, 0, propertiesLength);
Map<String, String> propertiesMap = MessageDecoder.string2messageProperties(properties);
keys = propertiesMap.get(MessageConst.PROPERTY_KEYS);
String tags = propertiesMap.get(MessageConst.PROPERTY_TAGS);
if (tags != null && tags.length() > 0) {
tagsCode =
MessageExtBrokerInner.tagsString2tagsCode(
MessageExt.parseTopicFilterType(sysFlag), tags);
}
}
return new DispatchRequest( //
topic, // 1
queueId, // 2
physicOffset, // 3
totalSize, // 4
tagsCode, // 5
storeTimestamp, // 6
queueOffset, // 7
keys, // 8
sysFlag, // 9
0L, // 10
preparedTransactionOffset, // 11
null // 12
);
} catch (BufferUnderflowException e) {
byteBuffer.position(byteBuffer.limit());
} catch (Exception e) {
byteBuffer.position(byteBuffer.limit());
}
return new DispatchRequest(-1);
}
