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App: refactor code to support various backup policies

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This commit is contained in:
wmayer
2020-02-24 18:01:22 +01:00
parent d813e5abf1
commit 2336d1be8d
1 changed files with 113 additions and 56 deletions
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169
src/App/Document.cpp
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@@ -2252,6 +2252,108 @@ bool Document::save (void)
return false;
}
namespace App {
// Helper class to handle different backup policies
class BackupPolicy {
public:
enum Policy {
Standard,
TimeStamp
};
BackupPolicy() {
policy = Standard;
numberOfFiles = 1;
}
~BackupPolicy() {
}
void setPolicy(Policy p) {
policy = p;
}
void setNumberOfFiles(int count) {
numberOfFiles = count;
}
void apply(const std::string& sourcename, const std::string& targetname) {
switch (policy) {
case Standard:
applyStandard(sourcename, targetname);
break;
case TimeStamp:
applyTimeStamp(sourcename, targetname);
break;
}
}
private:
void applyStandard(const std::string& sourcename, const std::string& targetname) {
// if saving the project data succeeded rename to the actual file name
Base::FileInfo fi(targetname);
if (fi.exists()) {
if (numberOfFiles > 0) {
int nSuff = 0;
std::string fn = fi.fileName();
Base::FileInfo di(fi.dirPath());
std::vector<Base::FileInfo> backup;
std::vector<Base::FileInfo> files = di.getDirectoryContent();
for (std::vector<Base::FileInfo>::iterator it = files.begin(); it != files.end(); ++it) {
std::string file = it->fileName();
if (file.substr(0,fn.length()) == fn) {
// starts with the same file name
std::string suf(file.substr(fn.length()));
if (suf.size() > 0) {
std::string::size_type nPos = suf.find_first_not_of("0123456789");
if (nPos==std::string::npos) {
// store all backup files
backup.push_back(*it);
nSuff = std::max<int>(nSuff, std::atol(suf.c_str()));
}
}
}
}
if (!backup.empty() && (int)backup.size() >= numberOfFiles) {
// delete the oldest backup file we found
Base::FileInfo del = backup.front();
for (std::vector<Base::FileInfo>::iterator it = backup.begin(); it != backup.end(); ++it) {
if (it->lastModified() < del.lastModified())
del = *it;
}
del.deleteFile();
fn = del.filePath();
}
else {
// create a new backup file
std::stringstream str;
str << fi.filePath() << (nSuff + 1);
fn = str.str();
}
if (fi.renameFile(fn.c_str()) == false)
Base::Console().Warning("Cannot rename project file to backup file\n");
}
else {
fi.deleteFile();
}
}
Base::FileInfo tmp(sourcename);
if (tmp.renameFile(targetname.c_str()) == false) {
Base::Console().Warning("Cannot rename file from '%s' to '%s'\n",
sourcename.c_str(), targetname.c_str());
}
}
void applyTimeStamp(const std::string& sourcename, const std::string& targetname) {
(void)sourcename;
(void)targetname;
}
private:
Policy policy;
int numberOfFiles;
};
}
bool Document::saveToFile(const char* filename) const
{
signalStartSave(*this, filename);
@@ -2310,63 +2412,18 @@ bool Document::saveToFile(const char* filename) const
if (policy) {
// if saving the project data succeeded rename to the actual file name
Base::FileInfo fi(filename);
if (fi.exists()) {
bool backup = App::GetApplication().GetParameterGroupByPath
("User parameter:BaseApp/Preferences/Document")->GetBool("CreateBackupFiles",true);
int count_bak = App::GetApplication().GetParameterGroupByPath
("User parameter:BaseApp/Preferences/Document")->GetInt("CountBackupFiles",1);
if (backup) {
int nSuff = 0;
std::string fn = fi.fileName();
Base::FileInfo di(fi.dirPath());
std::vector<Base::FileInfo> backup;
std::vector<Base::FileInfo> files = di.getDirectoryContent();
for (std::vector<Base::FileInfo>::iterator it = files.begin(); it != files.end(); ++it) {
std::string file = it->fileName();
if (file.substr(0,fn.length()) == fn) {
// starts with the same file name
std::string suf(file.substr(fn.length()));
if (suf.size() > 0) {
std::string::size_type nPos = suf.find_first_not_of("0123456789");
if (nPos==std::string::npos) {
// store all backup files
backup.push_back(*it);
nSuff = std::max<int>(nSuff, std::atol(suf.c_str()));
}
}
}
}
if (!backup.empty() && (int)backup.size() >= count_bak) {
// delete the oldest backup file we found
Base::FileInfo del = backup.front();
for (std::vector<Base::FileInfo>::iterator it = backup.begin(); it != backup.end(); ++it) {
if (it->lastModified() < del.lastModified())
del = *it;
}
del.deleteFile();
fn = del.filePath();
}
else {
// create a new backup file
std::stringstream str;
str << fi.filePath() << (nSuff + 1);
fn = str.str();
}
if (fi.renameFile(fn.c_str()) == false)
Base::Console().Warning("Cannot rename project file to backup file\n");
}
else {
fi.deleteFile();
}
}
if (tmp.renameFile(filename) == false) {
Base::Console().Warning("Cannot rename file from '%s' to '%s'\n",
fn.c_str(), filename);
int count_bak = App::GetApplication().GetParameterGroupByPath
("User parameter:BaseApp/Preferences/Document")->GetInt("CountBackupFiles",1);
bool backup = App::GetApplication().GetParameterGroupByPath
("User parameter:BaseApp/Preferences/Document")->GetBool("CreateBackupFiles",true);
if (!backup) {
count_bak = -1;
}
BackupPolicy policy;
policy.setPolicy(BackupPolicy::Standard);
policy.setNumberOfFiles(count_bak);
policy.apply(fn, filename);
}
signalFinishSave(*this, filename);