public boolean recoveryNeededAt(File dataDir) throws IOException {
long logVersion =
fs.fileExists(new File(dataDir, NeoStore.DEFAULT_NAME))
? new NeoStoreUtil(dataDir, fs).getLogVersion()
: 0;
return recoveryNeededAt(dataDir, logVersion);
}
/**
* Will move: messages.log.1 -> messages.log.2 messages.log -> messages.log.1
*
* <p>Will delete (if exists): messages.log.2
*/
private void moveAwayFile() {
File oldLogFile =
new File(file.getParentFile(), file.getName() + "." + NUMBER_OF_OLD_LOGS_TO_KEEP);
if (fileSystem.fileExists(oldLogFile)) {
fileSystem.deleteFile(oldLogFile);
}
for (int i = NUMBER_OF_OLD_LOGS_TO_KEEP - 1; i >= 0; i--) {
oldLogFile = new File(file.getParentFile(), file.getName() + (i == 0 ? "" : ("." + i)));
if (fileSystem.fileExists(oldLogFile)) {
try {
fileSystem.renameFile(
oldLogFile, new File(file.getParentFile(), file.getName() + "." + (i + 1)));
} catch (IOException e) {
throw new RuntimeException(e);
}
}
}
}
public boolean recoveryNeededAt(File dataDir, long currentLogVersion) throws IOException {
// We need config to determine where the logical log files are
File neoStorePath = new File(dataDir, NeoStore.DEFAULT_NAME);
if (!fs.fileExists(neoStorePath)) {
// No database in the specified directory.
return false;
}
PhysicalLogFiles logFiles = new PhysicalLogFiles(dataDir, fs);
File log = logFiles.getLogFileForVersion(currentLogVersion);
if (!fs.fileExists(log)) {
// This most likely means that the db has been cleanly shut down, i.e. force then inc log
// version,
// then NOT creating a new log file (will be done the next startup)
return false;
}
try (StoreChannel logChannel = fs.open(log, "r")) {
return LogRecoveryCheck.recoveryRequired(logChannel);
}
}
/**
* Moves a file from one directory to another, by a rename op.
*
* @param fs
* @param fileName The base filename of the file to move, not the complete path
* @param fromDirectory The directory currently containing filename
* @param toDirectory The directory to host filename - must be in the same disk partition as
* filename
* @param allowOverwriteTarget
* @throws java.io.IOException
*/
static void moveFile(
FileSystemAbstraction fs,
String fileName,
File fromDirectory,
File toDirectory,
boolean allowSkipNonExistentFiles,
boolean allowOverwriteTarget)
throws IOException {
File sourceFile = new File(fromDirectory, fileName);
if (allowSkipNonExistentFiles
&& !fs.fileExists(
sourceFile)) { // The source file doesn't exist and we allow skipping, so return
return;
}
File toFile = new File(toDirectory, fileName);
if (allowOverwriteTarget && fs.fileExists(toFile)) {
fs.deleteFile(toFile);
}
fs.moveToDirectory(sourceFile, toDirectory);
}
