/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_6_2_7/src/IOPool/Streamer/src/DQMEventMsgBuilder.cc

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#include "IOPool/Streamer/interface/DQMEventMsgBuilder.h"
#include "IOPool/Streamer/interface/MsgHeader.h"
#include "FWCore/Utilities/interface/Exception.h"
#include <cassert>
#include <cstring>


DQMEventMsgBuilder::DQMEventMsgBuilder(void* buf, uint32 bufSize,
                            uint32 run, uint32 event,
                            edm::Timestamp timeStamp,
                            //uint64 timeStamp,
                            uint32 lumiSection, uint32 updateNumber,
                            uint32 adler_chksum,
                            const char* host_name,
                            std::string const& releaseTag,
                            std::string const& topFolderName,
                            const DQMEvent::TObjectTable& monitorElementsBySubFolder):
  buf_((uint8*)buf),bufSize_(bufSize)
{
  DQMEventHeader* evtHdr;
  uint8* bufPtr;
  uint32 len;
  uint32 protocolVersion = 3;

  // fill in event header information
  bufPtr = buf_ + sizeof(DQMEventHeader);
  if (((uint32) (bufPtr - buf_)) > bufSize_)
    {
      throw cms::Exception("MessageBuilding", "DQMEventMsgBuilder")
        << "Input buffer size is too small for required header "
        << "information.  Size = " << bufSize_
        << ", necessary size is >= "
        << ((uint32) (bufPtr - buf_)) << ".\n";
    }

  evtHdr = (DQMEventHeader*) buf_;
  convert(protocolVersion, evtHdr->protocolVersion_);
  convert(run, evtHdr->runNumber_);
  convert(event, evtHdr->eventNumber_);

  convert(timeStamp.value(), evtHdr->timeStamp_);

  convert(lumiSection, evtHdr->lumiSection_);
  convert(updateNumber, evtHdr->updateNumber_);

  // copy the release tag into the message
  len = releaseTag.length();
  if (((uint32) (bufPtr + len + sizeof(uint32) - buf_)) > bufSize_)
    {
      throw cms::Exception("MessageBuilding", "DQMEventMsgBuilder")
        << "Input buffer size is too small for required header "
        << "information.  Size = " << bufSize_
        << ", necessary size is >= "
        << ((uint32) (bufPtr + len + sizeof(uint32) - buf_)) << ".\n";
    }
  convert(len, bufPtr);
  bufPtr += sizeof(uint32);
  releaseTag.copy((char*) bufPtr, len);
  bufPtr += len;

  // copy the top folder name into the message
  len = topFolderName.length();
  if (((uint32) (bufPtr + len + sizeof(uint32) - buf_)) > bufSize_)
    {
      throw cms::Exception("MessageBuilding", "DQMEventMsgBuilder")
        << "Input buffer size is too small for required header "
        << "information.  Size = " << bufSize_
        << ", necessary size is >= "
        << ((uint32) (bufPtr + len + sizeof(uint32) - buf_)) << ".\n";
    }
  convert(len, bufPtr);
  bufPtr += sizeof(uint32);
  topFolderName.copy((char*) bufPtr, len);
  bufPtr += len;

  // copy the subfolder count into the message
  convert(static_cast<uint32>(monitorElementsBySubFolder.size()), bufPtr);
  bufPtr += sizeof(uint32);

  // copy the ME count and name for each subfolder into the message
  DQMEvent::TObjectTable::const_iterator sfIter;
  for (sfIter = monitorElementsBySubFolder.begin();
       sfIter != monitorElementsBySubFolder.end(); sfIter++)
    {
      std::string subFolderName = sfIter->first;
      std::vector<TObject *> toList = sfIter->second;

      convert(static_cast<uint32>(toList.size()), bufPtr);
      bufPtr += sizeof(uint32);

      len = subFolderName.length();
      convert(len, bufPtr);
      bufPtr += sizeof(uint32);
      subFolderName.copy((char*) bufPtr, len);
      bufPtr += len;
    }
  // adler32 check sum of data blob
  convert(adler_chksum, bufPtr);
  bufPtr +=  sizeof(uint32);

  // put host name (Length and then Name) right after check sum
  uint32 host_name_len = strlen(host_name);
  assert(host_name_len < 0x00ff);
  //Put host_name_len
  *bufPtr++ = host_name_len;
  //Put host_name 
  memcpy(bufPtr,host_name,host_name_len);
  bufPtr += host_name_len;

  // set the header size and the event address, taking into account the
  // size of the event length field
  if (((uint32) (bufPtr + sizeof(uint32) - buf_)) > bufSize_)
    {
      throw cms::Exception("MessageBuilding", "DQMEventMsgBuilder")
        << "Input buffer size is too small for required header "
        << "information.  Size = " << bufSize_
        << ", necessary size is >= "
        << ((uint32) (bufPtr + sizeof(uint32) - buf_)) << ".\n";
    }
  convert(((uint32) (bufPtr - buf_)), evtHdr->headerSize_);
  bufPtr += sizeof(uint32);
  eventAddr_ = bufPtr;

  // set the event length to 0 initially.  (The setEventLength method
  // sets the message code and message size for us.  It shouldn't be called
  // until *after* the event address is set.)
  setEventLength(0);

  // initialize the compression flag to zero
  setCompressionFlag(0);

  // initialize the filter unit process ID to zero
  setFUProcessId(0);

  // initialize the filter unit GUID to zero
  setFUGuid(0);

  // initialize the merge count to zero
  setMergeCount(0);
}

void DQMEventMsgBuilder::setEventLength(uint32 len)
{
  if (((uint32) (eventAddr_ + len - buf_)) > bufSize_)
    {
      throw cms::Exception("MessageBuilding", "DQMEventMsgBuilder")
        << "Event data overflows buffer. Buffer size = " << bufSize_
        << ", header size = " << this->headerSize()
        << ", event size = " << len << ".\n";
    }
  convert(len, eventAddr_ - sizeof(char_uint32));
  DQMEventHeader* evtHdr = (DQMEventHeader*) buf_;
  new (&evtHdr->header_) Header(Header::DQM_EVENT, (eventAddr_ - buf_ + len));
}

void DQMEventMsgBuilder::setCompressionFlag(uint32 value)
{
  DQMEventHeader* evtHdr = (DQMEventHeader*) buf_;
  convert(value, evtHdr->compressionFlag_);
}

void DQMEventMsgBuilder::setFUProcessId(uint32 value)
{
  DQMEventHeader* evtHdr = (DQMEventHeader*) buf_;
  convert(value, evtHdr->fuProcessId_);
}

void DQMEventMsgBuilder::setFUGuid(uint32 value)
{
  DQMEventHeader* evtHdr = (DQMEventHeader*) buf_;
  convert(value, evtHdr->fuGuid_);
}

void DQMEventMsgBuilder::setMergeCount(uint32 value)
{
  DQMEventHeader* evtHdr = (DQMEventHeader*) buf_;
  convert(value, evtHdr->mergeCount_);
}

uint32 DQMEventMsgBuilder::size() const
{
  HeaderView v(buf_);
  return v.size();
}