LocalCacheFile.h

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#ifndef STORAGE_FACTORY_LOCAL_CACHE_FILE_H
#define STORAGE_FACTORY_LOCAL_CACHE_FILE_H

#include "Utilities/StorageFactory/interface/Storage.h"
#include "Utilities/StorageFactory/interface/File.h"
#include "FWCore/Utilities/interface/propagate_const.h"
#include <vector>
#include <string>
#include <memory>

namespace edm::storage {
  class LocalCacheFile : public Storage {
  public:
    LocalCacheFile(std::unique_ptr<Storage> base, const std::string &tmpdir = "");
    ~LocalCacheFile(void) override;

    using Storage::read;
    using Storage::write;

    bool prefetch(const IOPosBuffer *what, IOSize n) override;
    IOSize read(void *into, IOSize n) override;
    IOSize read(void *into, IOSize n, IOOffset pos) override;
    IOSize readv(IOBuffer *into, IOSize n) override;
    IOSize readv(IOPosBuffer *into, IOSize n) override;
    IOSize write(const void *from, IOSize n) override;
    IOSize write(const void *from, IOSize n, IOOffset pos) override;
    IOSize writev(const IOBuffer *from, IOSize n) override;
    IOSize writev(const IOPosBuffer *from, IOSize n) override;

    IOOffset position(IOOffset offset, Relative whence = SET) override;
    void resize(IOOffset size) override;
    void flush(void) override;
    void close(void) override;

  private:
    void cache(IOOffset start, IOOffset end);

    IOOffset image_;
    std::vector<char> present_;
    edm::propagate_const<std::unique_ptr<File>> file_;
    edm::propagate_const<std::unique_ptr<Storage>> storage_;
    bool closedFile_;
    unsigned int cacheCount_;
    unsigned int cacheTotal_;
  };
}  // namespace edm::storage
#endif  // STORAGE_FACTORY_LOCAL_CACHE_FILE_H