DelayedReader.h

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#ifndef FWCore_Framework_DelayedReader_h
#define FWCore_Framework_DelayedReader_h

/*----------------------------------------------------------------------

DelayedReader: The abstract interface through which the Principal
uses input sources to retrieve EDProducts from external storage.

----------------------------------------------------------------------*/

#include "DataFormats/Common/interface/WrapperOwningHolder.h"

#include <memory>

namespace edm {
  struct BranchKey;
  class EDProductGetter;
  class WrapperInterfaceBase;
  class DelayedReader {
  public:
    virtual ~DelayedReader();
    WrapperOwningHolder getProduct(BranchKey const& k, WrapperInterfaceBase const* interface, EDProductGetter const* ep) {
      return getProduct_(k, interface, ep);
    }
    void mergeReaders(DelayedReader* other) {mergeReaders_(other);}
    void reset() {reset_();}
  private:
    virtual WrapperOwningHolder getProduct_(BranchKey const& k,
                                            WrapperInterfaceBase const* interface,
                                            EDProductGetter const* ep) const = 0;
    virtual void mergeReaders_(DelayedReader*) = 0;
    virtual void reset_() = 0;
  };
}

#endif