ExternalRandomAccessFile.h

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#ifndef __BUSBOY_EXTERNAL_RANDOM_ACCESS_FILE_H__
#define __BUSBOY_EXTERNAL_RANDOM_ACCESS_FILE_H__

#include <mutex>
#include "dataset/dataset_api.h"

namespace BUSBOY {

class ExternalRandomAccessFileImpl;

class ExternalRandomAccessFile : public virtual RandomAccessFile {

        public:

                ExternalRandomAccessFile(const CExternalRandomAccessFileCallbacks& callbacks);

                size_t read(char* buf, size_t num);

                size_t getLocation();

                void setLocation(size_t loc);

                void setLocationFromEnd(size_t loc);

                void skipForward(size_t num);

                void skipBackward(size_t num);

                size_t getFileSize();

                void close();

                bool isClosed() const;

                ~ExternalRandomAccessFile();

        protected:

                void assertNotClosed() const;

                std::unique_lock<std::mutex> getLock(); // So we can lock the same mutex in ExternalRandomAccessFileSink

                const CExternalRandomAccessFileCallbacks& getCallbacks() const;

        private:

                ExternalRandomAccessFileImpl* m_impl;

                // prevent calling these
                ExternalRandomAccessFile(const ExternalRandomAccessFile& context);
                ExternalRandomAccessFile& operator=(const ExternalRandomAccessFile& context);




};

}

#endif