TFragmentChainLoop.cxx

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#include "TFragmentChainLoop.h"
 
#include <chrono>
#include <thread>
 
#include "TGRSIint.h"
#include "TFragment.h"
 
TFragmentChainLoop* TFragmentChainLoop::Get(std::string name, TChain* chain)
{
   if(name.length() == 0) {
      name = "chain_loop";
   }
 
   auto* loop = static_cast<TFragmentChainLoop*>(StoppableThread::Get(name));
   if(loop == nullptr) {
      if((chain == nullptr) && (gFragment == nullptr)) {
         return nullptr;
      }
      if(chain == nullptr) {
         chain = gFragment;
      }
      loop = new TFragmentChainLoop(name, chain);
   }
   return loop;
}
 
TFragmentChainLoop::TFragmentChainLoop(std::string name, TChain* chain)
   : StoppableThread(std::move(name)), fEntriesTotal(chain->GetEntries()),
     fInputChain(chain), fFragment(nullptr), fSelfStopping(true)
{
   SetupChain();
}
 
TFragmentChainLoop::~TFragmentChainLoop() = default;
 
void TFragmentChainLoop::ClearQueue()
{
   for(const auto& outQueue : fOutputQueues) {
      while(outQueue->Size() != 0u) {
         std::shared_ptr<const TFragment> event;
         outQueue->Pop(event);
      }
   }
}
 
int TFragmentChainLoop::SetupChain()
{
   if(fInputChain == nullptr) {
      return 0;
   }
 
   fInputChain->SetBranchAddress("TFragment", &fFragment);
   return 0;
}
 
void TFragmentChainLoop::Restart()
{
   ItemsPopped(0);
}
 
void TFragmentChainLoop::OnEnd()
{
   for(const auto& outQueue : fOutputQueues) {
      outQueue->SetFinished();
   }
}
 
bool TFragmentChainLoop::Iteration()
{
   if(static_cast<int64_t>(ItemsPopped()) >= fEntriesTotal) {
      if(fSelfStopping) {
         return false;
      }
      std::this_thread::sleep_for(std::chrono::milliseconds(1000));
      return true;
   }
 
   std::shared_ptr<TFragment> frag = std::make_shared<TFragment>();
   fInputChain->GetEntry(ItemsPopped());
   IncrementItemsPopped();
   *frag = *fFragment;
   frag->SetEntryNumber();
   for(const auto& outQueue : fOutputQueues) {
      outQueue->Push(frag);
   }
   InputSize(fEntriesTotal - ItemsPopped());   // this way fInputSize+fItemsPopped gives the total number of entries
 
   return true;
}