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#pragma once
#include <Backups/BackupEntryWithChecksumCalculation.h>
namespace DB
{
/// Represents a file prepared to be included in a backup, assuming that until this backup entry is destroyed
/// the file can be appended with new data, but the bytes which are already in the file won't be changed.
class BackupEntryFromAppendOnlyFile : public BackupEntryWithChecksumCalculation<IBackupEntry>
{
public:
/// The constructor is allowed to not set `file_size_`, in that case it will be calculated from the data.
BackupEntryFromAppendOnlyFile(
const DiskPtr & disk_,
const String & file_path_,
bool copy_encrypted_ = false,
const std::optional<UInt64> & file_size_ = {});
~BackupEntryFromAppendOnlyFile() override;
std::unique_ptr<SeekableReadBuffer> getReadBuffer(const ReadSettings & read_settings) const override;
UInt64 getSize() const override { return size; }
DataSourceDescription getDataSourceDescription() const override { return data_source_description; }
bool isEncryptedByDisk() const override { return copy_encrypted; }
bool isFromFile() const override { return true; }
DiskPtr getDisk() const override { return disk; }
String getFilePath() const override { return file_path; }
private:
const DiskPtr disk;
const String file_path;
const DataSourceDescription data_source_description;
const bool copy_encrypted;
const UInt64 size;
};
}
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