StreamerInputSource.h

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#ifndef IOPool_Streamer_StreamerInputSource_h
#define IOPool_Streamer_StreamerInputSource_h

#include "TBufferFile.h"

#include "FWCore/Framework/interface/Frameworkfwd.h"
#include "FWCore/Sources/interface/RawInputSource.h"
#include "FWCore/Utilities/interface/propagate_const.h"

#include "DataFormats/Streamer/interface/StreamedProducts.h"
#include "DataFormats/Common/interface/EDProductGetter.h"

#include <memory>
#include <vector>

class InitMsgView;
class EventMsgView;

namespace edm {
  class BranchIDListHelper;
  class ParameterSetDescription;
  class ThinnedAssociationsHelper;

  class StreamerInputSource : public RawInputSource {
  public:  
    explicit StreamerInputSource(ParameterSet const& pset,
                 InputSourceDescription const& desc);
    ~StreamerInputSource() override;
    static void fillDescription(ParameterSetDescription& description);

    std::unique_ptr<SendJobHeader> deserializeRegistry(InitMsgView const& initView);

    void deserializeAndMergeWithRegistry(InitMsgView const& initView, bool subsequent = false);

    void deserializeEvent(EventMsgView const& eventView);

    static
    void mergeIntoRegistry(SendJobHeader const& header,
                           ProductRegistry&,
                           BranchIDListHelper&,
                           ThinnedAssociationsHelper&,
                           bool subsequent);

    static unsigned int uncompressBuffer(unsigned char* inputBuffer,
                                         unsigned int inputSize,
                                         std::vector<unsigned char>& outputBuffer,
                                         unsigned int expectedFullSize);
  protected:
    static void declareStreamers(SendDescs const& descs);
    static void buildClassCache(SendDescs const& descs);
    void resetAfterEndRun();

  private:

    class EventPrincipalHolder : public EDProductGetter {
    public:
      EventPrincipalHolder();
      ~EventPrincipalHolder() override;

      WrapperBase const* getIt(ProductID const& id) const override;
      WrapperBase const* getThinnedProduct(ProductID const&, unsigned int&) const override;
      void getThinnedProducts(ProductID const& pid,
                                      std::vector<WrapperBase const*>& wrappers,
                                      std::vector<unsigned int>& keys) const override;


      unsigned int transitionIndex_() const override;

      void setEventPrincipal(EventPrincipal* ep);

    private:
      // We don't own the principal.  The lifetime must be managed externally.
      EventPrincipal const* eventPrincipal_;
    };

    void read(EventPrincipal& eventPrincipal) override;

    void setRun(RunNumber_t r) override;

    std::unique_ptr<FileBlock> readFile_() override;

    edm::propagate_const<TClass*> tc_;
    std::vector<unsigned char> dest_;
    TBufferFile xbuf_;
    edm::propagate_const<std::unique_ptr<SendEvent>> sendEvent_;
    edm::propagate_const<std::unique_ptr<EventPrincipalHolder>> eventPrincipalHolder_;
    std::vector<edm::propagate_const<std::unique_ptr<EventPrincipalHolder>>> streamToEventPrincipalHolders_;
    bool adjustEventToNewProductRegistry_;

    std::string processName_;
    unsigned int protocolVersion_;
  }; //end-of-class-def
} // end of namespace-edm
  
#endif