private Database readWinnersDatabase(Branch winnersApplyBranch, List<File> remoteDatabases)
throws IOException {
// Make map 'short filename' -> 'full filename'
Map<String, File> shortFilenameToFileMap = new HashMap<String, File>();
for (File remoteDatabase : remoteDatabases) {
shortFilenameToFileMap.put(remoteDatabase.getName(), remoteDatabase);
}
// Load individual databases for branch ranges
DatabaseDAO databaseDAO = new XmlDatabaseDAO(config.getTransformer());
Database winnerBranchDatabase =
new Database(); // Database cannot be reused, since these might be different clients
String clientName = null;
VectorClock clientVersionFrom = null;
VectorClock clientVersionTo = null;
for (DatabaseVersionHeader databaseVersionHeader : winnersApplyBranch.getAll()) {
// First of range for this client
if (clientName == null || !clientName.equals(databaseVersionHeader.getClient())) {
clientName = databaseVersionHeader.getClient();
clientVersionFrom = databaseVersionHeader.getVectorClock();
clientVersionTo = databaseVersionHeader.getVectorClock();
}
// Still in range for this client
else if (clientName.equals(databaseVersionHeader.getClient())) {
clientVersionTo = databaseVersionHeader.getVectorClock();
}
String potentialDatabaseShortFileNameForRange =
"db-" + clientName + "-" + clientVersionTo.get(clientName); // TODO [medium] Naming stuff
File databaseFileForRange =
shortFilenameToFileMap.get(potentialDatabaseShortFileNameForRange);
if (databaseFileForRange != null) {
// Load database
logger.log(
Level.INFO,
"- Loading "
+ databaseFileForRange
+ " (from "
+ clientVersionFrom
+ ", to "
+ clientVersionTo
+ ") ...");
databaseDAO.load(
winnerBranchDatabase, databaseFileForRange, clientVersionFrom, clientVersionTo);
// Reset range
clientName = null;
clientVersionFrom = null;
clientVersionTo = null;
}
}
return winnerBranchDatabase;
}
private void applyWinnersBranch(Branch winnersBranch, List<File> unknownRemoteDatabasesInCache)
throws Exception {
Branch winnersApplyBranch =
databaseReconciliator.findWinnersApplyBranch(localBranch, winnersBranch);
logger.log(Level.INFO, "- Database versions to APPLY locally: " + winnersApplyBranch);
if (winnersApplyBranch.size() == 0) {
logger.log(Level.WARNING, " + Nothing to update. Nice!");
result.setResultCode(DownResultCode.OK_NO_REMOTE_CHANGES);
} else {
logger.log(Level.INFO, "- Loading winners database ...");
Database winnersDatabase =
readWinnersDatabase(winnersApplyBranch, unknownRemoteDatabasesInCache);
FileSystemActionReconciliator actionReconciliator =
new FileSystemActionReconciliator(config, localDatabase, result);
List<FileSystemAction> actions =
actionReconciliator.determineFileSystemActions(winnersDatabase);
Set<MultiChunkEntry> unknownMultiChunks =
determineRequiredMultiChunks(actions, winnersDatabase);
downloadAndDecryptMultiChunks(unknownMultiChunks);
applyFileSystemActions(actions);
// Add winners database to local database
// Note: This must happen AFTER the file system stuff, because we compare the winners database
// with the local database!
for (DatabaseVersionHeader applyDatabaseVersionHeader : winnersApplyBranch.getAll()) {
logger.log(
Level.INFO,
" + Applying database version " + applyDatabaseVersionHeader.getVectorClock());
DatabaseVersion applyDatabaseVersion =
winnersDatabase.getDatabaseVersion(applyDatabaseVersionHeader.getVectorClock());
localDatabase.addDatabaseVersion(applyDatabaseVersion);
}
logger.log(Level.INFO, "- Saving local database to " + config.getDatabaseFile() + " ...");
saveLocalDatabase(localDatabase, config.getDatabaseFile());
result.setResultCode(DownResultCode.OK_WITH_REMOTE_CHANGES);
}
}
public static DatabaseVersionHeader createFromString(String databaseVersionHeaderString)
throws Exception {
Matcher databaseVersionHeaderMatcher =
databaseVersionHeaderPattern.matcher(databaseVersionHeaderString);
if (!databaseVersionHeaderMatcher.matches()) {
throw new Exception("Invalid database version header string: " + databaseVersionHeaderString);
}
String client = databaseVersionHeaderMatcher.group(1);
String vectorClockString = databaseVersionHeaderMatcher.group(2);
long databaseVersionHeaderTime = Long.parseLong(databaseVersionHeaderMatcher.group(3));
VectorClock vectorClock = createVectorClock(vectorClockString);
DatabaseVersionHeader newDatabaseVersionHeader = new DatabaseVersionHeader();
newDatabaseVersionHeader.setDate(new Date(databaseVersionHeaderTime));
newDatabaseVersionHeader.setVectorClock(vectorClock);
newDatabaseVersionHeader.setClient(client);
return newDatabaseVersionHeader;
}
private void pruneConflictingLocalBranch(Branch winnersBranch) throws Exception {
Branch localPruneBranch =
databaseReconciliator.findLosersPruneBranch(localBranch, winnersBranch);
logger.log(Level.INFO, "- Database versions to REMOVE locally: " + localPruneBranch);
if (localPruneBranch.size() == 0) {
logger.log(Level.INFO, " + Nothing to prune locally. No conflicts. Only updates. Nice!");
} else {
// Load dirty database (if existent)
logger.log(Level.INFO, " + Pruning databases locally ...");
Database dirtyDatabase = new Database();
for (DatabaseVersionHeader databaseVersionHeader : localPruneBranch.getAll()) {
// Database version
DatabaseVersion databaseVersion =
localDatabase.getDatabaseVersion(databaseVersionHeader.getVectorClock());
dirtyDatabase.addDatabaseVersion(databaseVersion);
// Remove database version locally
logger.log(Level.INFO, " * Removing " + databaseVersionHeader + " ...");
localDatabase.removeDatabaseVersion(databaseVersion);
DatabaseRemoteFile remoteFileToPrune =
new DatabaseRemoteFile(
"db-"
+ config.getMachineName()
+ "-"
+ databaseVersionHeader.getVectorClock().get(config.getMachineName()));
logger.log(Level.INFO, " * Deleting remote database file " + remoteFileToPrune + " ...");
transferManager.delete(remoteFileToPrune);
}
logger.log(
Level.INFO, " * Saving dirty database to " + config.getDirtyDatabaseFile() + " ...");
saveLocalDatabase(dirtyDatabase, config.getDirtyDatabaseFile());
}
}
public static DatabaseVersion createDatabaseVersion(
DatabaseVersionHeader basedOnDatabaseVersionHeader, Date date) {
VectorClock vectorClock =
(basedOnDatabaseVersionHeader != null)
? basedOnDatabaseVersionHeader.getVectorClock().clone()
: new VectorClock();
vectorClock.incrementClock("someclient");
DatabaseVersion databaseVersion = new DatabaseVersion();
databaseVersion.setClient("someclient");
databaseVersion.setTimestamp(date);
databaseVersion.setVectorClock(vectorClock);
return databaseVersion;
}
