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File indexing completed on 2025-04-22 06:27:17

 #include "FWCore/Common/interface/OutputProcessBlockHelper.h"
 
 #include "DataFormats/Provenance/interface/StoredProcessBlockHelper.h"
 #include "FWCore/Common/interface/ProcessBlockHelperBase.h"
 
 #include <algorithm>
 #include <cassert>
 #include <utility>
 
 namespace edm {
 
   void OutputProcessBlockHelper::updateAfterProductSelection(
       std::set<std::string> const& processesWithKeptProcessBlockProducts,
       ProcessBlockHelperBase const& processBlockHelper) {
     processBlockHelper_ = &processBlockHelper;
 
     // Copy the list of processes with ProcessBlock products from the EventProcessor,
     // except remove any processes where the output module calling this has dropped all ProcessBlock
     // products. We want to maintain the same order and only remove elements. Fill a vector that can
     // translate from one process list to the other.
     assert(processesWithProcessBlockProducts_.empty());
     unsigned int iProcess = 0;
     for (auto const& process : processBlockHelper.processesWithProcessBlockProducts()) {
       if (processesWithKeptProcessBlockProducts.find(process) != processesWithKeptProcessBlockProducts.end()) {
         processesWithProcessBlockProducts_.emplace_back(process);
         translateFromStoredIndex_.emplace_back(iProcess);
       }
       ++iProcess;
     }
 
     for (auto const& addedProcess : processBlockHelper.addedProcesses()) {
       // count new processes producing ProcessBlock products that are
       // kept by the OutputModule. There can be at most 1.
       if (std::find(processesWithProcessBlockProducts_.begin(),
                     processesWithProcessBlockProducts_.end(),
                     addedProcess) != processesWithProcessBlockProducts_.end()) {
         ++nAddedProcesses_;
       }
     }
 
     // Determine if any ProcessBlock product from the input file is kept by the output module.
     // Do this by looking for a process name on both the list of processes with ProcessBlock
     // products kept by the output module and process names from the input with ProcessBlock
     // products.
     productsFromInputKept_ =
         std::find_first_of(processesWithProcessBlockProducts_.begin(),
                            processesWithProcessBlockProducts_.end(),
                            processBlockHelper.topProcessesWithProcessBlockProducts().begin(),
                            processBlockHelper.topProcessesWithProcessBlockProducts().begin() +
                                processBlockHelper.nProcessesInFirstFile()) != processesWithProcessBlockProducts_.end();
   }
 
   void OutputProcessBlockHelper::fillCacheIndices(StoredProcessBlockHelper& storedProcessBlockHelper) const {
     // The stored cache indices are the ones we want to fill.
     // This will get written to the output file.
     // Note for output the vector of vectors is flattened into a single vector
     std::vector<unsigned int> storedCacheIndices;
 
     // Number of processes in StoredProcessBlockHelper.
     unsigned int nStoredProcesses = storedProcessBlockHelper.processesWithProcessBlockProducts().size();
 
     if (!productsFromInputKept_) {
       // This is really simple if we are not keeping any ProcessBlock products
       // from the input file. Deal with that special case first.
       // nStoredProcesses will be 1.
       assert(nAddedProcesses_ == nStoredProcesses);
       storedCacheIndices.reserve(nStoredProcesses);
       for (unsigned int i = 0; i < nStoredProcesses; ++i) {
         storedCacheIndices.push_back(i);
       }
       storedProcessBlockHelper.setProcessBlockCacheIndices(std::move(storedCacheIndices));
       return;
     }
 
     // Cache indices of the main ProcessBlockHelper we use as input. This
     // ProcessBlockHelper is owned by the EventProcessor.
     std::vector<std::vector<unsigned int>> const& cacheIndices = processBlockHelper_->processBlockCacheIndices();
 
     // We need to convert the cache indices in the ProcessBlockHelper to have different values when
     // put in the StoredProcessBlockHelper. The values are not the same because the ProcessBlocks are
     // not read in the same order in this process as compared to the next process which will read
     // the output file that is being written (the read order is the same as the order the cache
     // objects are placed in the cache vectors). In this process, they are ordered first by input file,
     // second by process and last by TTree entry. In the next process, this output file will be read
     // as a single input file. The ProcessBlocks are read in process order (this will be a subset
     // of the process list in ProcessBlockHelper, maybe smaller or maybe the same), and finally in
     // order of entry in the TTree. This conversion is done by subtracting and adding some
     // offsets and a lot of the following code involves calculating these offsets to do the conversion.
 
     // We will need the info in these to calculate the offsets
     std::vector<unsigned int> const& cacheIndexVectorsPerFile = processBlockHelper_->cacheIndexVectorsPerFile();
     std::vector<unsigned int> const& cacheEntriesPerFile = processBlockHelper_->cacheEntriesPerFile();
     std::vector<std::vector<unsigned int>> const& nEntries = processBlockHelper_->nEntries();
 
     assert(!cacheIndices.empty());
     // Count processes in the input file with saved ProcessBlock products in the output
     unsigned int nInputProcesses = 0;
     for (unsigned int iStoredProcess = 0; iStoredProcess < nStoredProcesses; ++iStoredProcess) {
       // The existing cache indices in processBlockHelper include only indices
       // corresponding to the processes in the input files. If there are more, then
       // they correspond to current process (and there only will be more if some
       // of the newly produced ProcessBlock products are going to be kept).
       // There will be at most 1 added process.
       if (translateFromStoredIndex_[iStoredProcess] < cacheIndices[0].size()) {
         ++nInputProcesses;
       }
     }
 
     // The following are the 4 offsets. The first two are defined relative to the
     // cache sequence in this process. The second two offsets are defined relative
     // to the cache sequence when the output file we are writing is read.
 
     // 1. Total number of cache entries in all input files prior to the current input file
     unsigned int fileOffset = 0;
 
     // 2. For each process, the total number of cache entries in processes in the current
     // input file and before the process
     std::vector<unsigned int> processOffset(nInputProcesses, 0);
 
     // 3. For each input process with ProcessBlock products stored by this
     // output module, the total number of cache entries in earlier input processes
     // that have ProcessBlock products stored by this output module.
     // Summed over all input files and including only processes in StoredProcessBlockHelper.
     // Plus an extra element at the end that includes all entries in all such processes.
     assert(!nEntries.empty());
     std::vector<unsigned int> storedProcessOffset(nInputProcesses + 1, 0);
 
     // 4. For each process with ProcessBlock products stored by this output module,
     // the total number of cache entries in that process in all input files before
     // the current input file.
     std::vector<unsigned int> storedFileInProcessOffset(nInputProcesses, 0);
 
     setStoredProcessOffset(nInputProcesses, nEntries, storedProcessOffset);
 
     storedCacheIndices.reserve(cacheIndices.size() * nStoredProcesses);
 
     unsigned int iFile = 0;
     unsigned int innerVectorsCurrentFile = 0;
 
     // In ProcessBlockHelper, there is a vector which contains vectors
     // of cache indices. Iterate over the inner vectors.
     for (auto const& innerVectorOfCacheIndices : cacheIndices) {
       // The inner vectors are associated with input files. Several contiguous
       // inner vectors can be associated with the same input file. Check to
       // see if we have crossed an input file boundary and set the file
       // index, iFile, at the next file associated with at least
       // one inner vector if necessary.
       while (innerVectorsCurrentFile == cacheIndexVectorsPerFile[iFile]) {
         // Sum cache entries for all files before the current file in
         // ProcessBlockHelper
         fileOffset += cacheEntriesPerFile[iFile];
         ++iFile;
         innerVectorsCurrentFile = 0;
       }
       if (innerVectorsCurrentFile == 0) {
         // Call these when the input file changes
         setProcessOffset(iFile, nInputProcesses, nEntries, processOffset);
         setStoredFileInProcessOffset(iFile, nInputProcesses, nEntries, storedFileInProcessOffset);
       }
       ++innerVectorsCurrentFile;
 
       assert(nInputProcesses + nAddedProcesses_ == nStoredProcesses);
 
       // Really fill the cache indices that will be stored in the output file in this loop
       for (unsigned int iStoredProcess = 0; iStoredProcess < nStoredProcesses; ++iStoredProcess) {
         unsigned int storedCacheIndex = ProcessBlockHelperBase::invalidCacheIndex();
         if (iStoredProcess < nInputProcesses) {
           unsigned int cacheIndex = innerVectorOfCacheIndices[translateFromStoredIndex_[iStoredProcess]];
           if (cacheIndex != ProcessBlockHelperBase::invalidCacheIndex()) {
             // The offsets count in the cache sequence to the first entry in
             // the current input file and process
             unsigned int inputOffset = fileOffset + processOffset[iStoredProcess];
             unsigned int storedOffset = storedProcessOffset[iStoredProcess] + storedFileInProcessOffset[iStoredProcess];
             storedCacheIndex = cacheIndex - inputOffset + storedOffset;
           }
         } else {
           // This corresponds to the current process if it has newly produced
           // ProcessBlock products.
           storedCacheIndex = storedProcessOffset[nInputProcesses] + iStoredProcess - nInputProcesses;
         }
         storedCacheIndices.push_back(storedCacheIndex);
       }
     }
     storedProcessBlockHelper.setProcessBlockCacheIndices(std::move(storedCacheIndices));
   }
 
   void OutputProcessBlockHelper::setStoredProcessOffset(unsigned int nInputProcesses,
                                                         std::vector<std::vector<unsigned int>> const& nEntries,
                                                         std::vector<unsigned int>& storedProcessOffset) const {
     unsigned int iStored = 0;
     for (auto& offset : storedProcessOffset) {
       offset = 0;
       // loop over earlier processes
       for (unsigned int jStored = 0; jStored < iStored; ++jStored) {
         unsigned int indexInEventProcessor = translateFromStoredIndex_[jStored];
         // loop over input files
         for (auto const& entries : nEntries) {
           assert(indexInEventProcessor < entries.size());
           offset += entries[indexInEventProcessor];
         }
       }
       ++iStored;
     }
   }
 
   void OutputProcessBlockHelper::setProcessOffset(unsigned int iFile,
                                                   unsigned int nInputProcesses,
                                                   std::vector<std::vector<unsigned int>> const& nEntries,
                                                   std::vector<unsigned int>& processOffset) const {
     unsigned int iStored = 0;
     for (auto& offset : processOffset) {
       offset = 0;
       unsigned int iProcess = translateFromStoredIndex_[iStored];
       for (unsigned int jProcess = 0; jProcess < iProcess; ++jProcess) {
         offset += nEntries[iFile][jProcess];
       }
       ++iStored;
     }
   }
 
   void OutputProcessBlockHelper::setStoredFileInProcessOffset(
       unsigned int iFile,
       unsigned int nInputProcesses,
       std::vector<std::vector<unsigned int>> const& nEntries,
       std::vector<unsigned int>& storedFileInProcessOffset) const {
     unsigned int iStored = 0;
     for (auto& offset : storedFileInProcessOffset) {
       offset = 0;
       unsigned int indexInEventProcessor = translateFromStoredIndex_[iStored];
       // loop over input files before current input file
       for (unsigned int jFile = 0; jFile < iFile; ++jFile) {
         assert(indexInEventProcessor < nEntries[jFile].size());
         offset += nEntries[jFile][indexInEventProcessor];
       }
       ++iStored;
     }
   }
 
 }  // namespace edm

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