// 存储格式 <MAGIC CODE> <LEN> <DATA>
INT32 MessageStoreImpl::put(const MsgDataVector& msgs, const INT32 beginIndex, MapedFile& mapedFile, UINT32& wroteOffset)
{
INT32 storeCnt = 0;
if(msgs.empty())
{
return -1;
}
if(!this->m_MapedFileManager.getCurrentMapedFile(mapedFile, getMsgLen(msgs[beginIndex].len)))
{
return -1;
}
UINT32 writingOffset = mapedFile.write_offset;
for(size_t i = beginIndex; i < msgs.size(); i++)
{
INT32 len = msgs[i].len;
void* msg = msgs[i].msg;
memcpy((char*)mapedFile.pmap + writingOffset, &MSG_BLOCK_MAGIC_CODE, sizeof(MSG_BLOCK_MAGIC_CODE));
writingOffset += sizeof(MSG_BLOCK_MAGIC_CODE);
memcpy((char*)mapedFile.pmap + writingOffset, &len, sizeof(len));
writingOffset += sizeof(len);
memcpy((char*)mapedFile.pmap + writingOffset, msg, len);
writingOffset += len;
storeCnt++;
if((i + 1) < msgs.size())
{
if((this->getMsgLen(msgs[i + 1].len) > (UINT32)(MAPED_FILE_SIZE_TMP1 - writingOffset)))
{
break;
}
}
}
wroteOffset = writingOffset;
return storeCnt;
}
EXTXMLMETHOD long OSXMLEncodeBuffer::write (FILE* fp)
{
return (long)fwrite (getMsgPtr(), 1, getMsgLen(), fp);
}
void MessageStoreImpl::fetch(MsgIndexVector& msgIndexs, MSG_OFFSET& fetchedOffset, const INT32& max)
{
INT32 scanedMsgCnt = 0;
MSG_OFFSET currentFetching = (MSG_OFFSET)m_fetchingOffset;
const UINT32 minMsgLen = getMsgLen(0);
while(scanedMsgCnt < max)
{
MapedFile mapedFile;
MSG_OFFSET currentMapedKey = 0;
if(!this->m_MapedFileManager.pickMapedFile(mapedFile, currentMapedKey, currentFetching))
{
break;
}
bool currentMapedFileOver = false;
// 数据在mmap memory buffer
if(mapedFile.pmap != NULL)
{
UINT32 offset = currentFetching % MAPED_FILE_SIZE_TMP1;
for(; (offset < mapedFile.write_offset) && (scanedMsgCnt < max);)
{
UINT32 lastOffset = offset;
if((mapedFile.write_offset - offset) <= minMsgLen)
{
offset = mapedFile.write_offset;
}
else
{
INT32 magicCode = 0;
INT32 msgLen = 0;
memcpy(&magicCode, (char*)mapedFile.pmap + offset, sizeof(magicCode));
memcpy(&msgLen, (char*)mapedFile.pmap + offset + sizeof(magicCode), sizeof(msgLen));
// 有效Msg
if(MSG_BLOCK_MAGIC_CODE == magicCode)
{
MsgIndex msgIndex;
msgIndex.offset = lastOffset + getMsgLen(0);
msgIndex.len = msgLen;
msgIndexs.push_back(msgIndex);
offset += getMsgLen(msgLen);
scanedMsgCnt++;
}
#if MAPED_FILE_COMMIT_TYPE_FORWARD_ALIGN
else
{
offset = mapedFile.write_offset;
}
#else
// 长度>=8字节的空洞
else if(EMPTY_BLOCK_MAGIC_CODE == magicCode)
{
offset += getMsgLen(msgLen);
}
// 长度<8字节的空洞
else
{
while(0 == *((char*)mapedFile.pmap + offset)) offset++;
}
#endif
}
}
currentMapedFileOver = offset >= mapedFile.write_offset;
currentFetching += (offset - (currentFetching % MAPED_FILE_SIZE_TMP1));
}
