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// **************************************************************************
// * This file is part of the FreeFileSync project. It is distributed under *
// * GNU General Public License: http://www.gnu.org/licenses/gpl.html *
// * Copyright (C) ZenJu (zenju AT gmx DOT de) - All Rights Reserved *
// **************************************************************************
#ifndef VERSIONING_HEADER_8760247652438056
#define VERSIONING_HEADER_8760247652438056
#include <vector>
#include <functional>
#include <zen/time.h>
#include <zen/zstring.h>
#include <zen/int64.h>
#include <zen/file_error.h>
namespace zen
{
struct CallbackMoveFile;
//e.g. move C:\Source\subdir\Sample.txt -> D:\Revisions\subdir\Sample.txt 2012-05-15 131513.txt
//scheme: <revisions directory>\<relpath>\<filename>.<ext> YYYY-MM-DD HHMMSS.<ext>
/*
- ignores missing source files/dirs
- creates missing intermediate directories
- does not create empty directories
- handles symlinks
- ignores already existing target files/dirs (support retry)
=> (unlikely) risk of data loss: race-condition if two FFS instances start at the very same second and process the same filename!!
*/
class FileVersioner
{
public:
FileVersioner(const Zstring& versioningDirectory, //throw FileError
const TimeComp& timeStamp,
int versionCountLimit) : //max versions per file; < 0 := no limit
versioningDirectory_(versioningDirectory),
timeStamp_(formatTime<Zstring>(Zstr("%Y-%m-%d %H%M%S"), timeStamp)), //e.g. "2012-05-15 131513"
versionCountLimit_(versionCountLimit)
{
if (timeStamp_.size() != 17) //formatTime() returns empty string on error; unexpected length: e.g. problem in year 10000!
throw FileError(_("Failure to create time stamp for versioning:") + L" \'" + timeStamp_ + L"\'");
}
void revisionFile(const Zstring& sourceFile, const Zstring& relativeName, CallbackMoveFile& callback); //throw FileError
void revisionDir (const Zstring& sourceDir, const Zstring& relativeName, CallbackMoveFile& callback); //throw FileError
void limitVersions(std::function<void()> updateUI); //throw FileError; call when done revisioning!
private:
const Zstring versioningDirectory_;
const Zstring timeStamp_;
const int versionCountLimit_;
std::vector<Zstring> fileRelnames; //store list of revisioned files and symlinks (relativeName) for limitVersions()
};
struct CallbackMoveFile
{
virtual ~CallbackMoveFile() {} //see CallbackCopyFile for limitations when throwing exceptions!
virtual void onBeforeFileMove(const Zstring& fileFrom, const Zstring& fileTo) = 0; //one call before each (planned) move
virtual void onBeforeDirMove (const Zstring& dirFrom, const Zstring& dirTo ) = 0; //
virtual void objectProcessed() = 0; //one call after each completed move (count objects total)
//called frequently if move has to revert to copy + delete:
virtual void updateStatus(Int64 bytesDelta) = 0;
};
namespace impl //declare for unit tests:
{
bool isMatchingVersion(const Zstring& shortname, const Zstring& shortnameVersion);
}
}
#endif //VERSIONING_HEADER_8760247652438056
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