/* Entry point for un-sharing file with a user*/
public void unShareFileWithUser(string clientId, string filename, string sharedWithUser)
{
Logger.Debug("Un Sharing file " + filename + " owned by user " + clientId + " with user " + sharedWithUser);
UserFileSystem fs = getUserFSFromMapSynchronized(clientId);
bool filepresent = fs.isFilePresentSynchronized(filename);
fs.removeSharedUserFromFileSynchronized(filename, sharedWithUser);
if (!filepresent)
{
throw new FileNotFoundException("File not present in memory for client : " + filename + " for client : " + clientId);
}
UserFileSystem sharedFS = getUserFSFromMapSynchronized(sharedWithUser);
bool deleted = sharedFS.deleteSharedFileSynchronized(new SharedFile(clientId, filename));
if (!deleted)
{
Logger.Debug("Shared file was not present , skipping deletion");
}
}
/* Entry point for delete file*/
public bool deleteFileSynchronized(string clientid, string filename)
{
Logger.Debug("Deleting file : " + filename + " owned by : " + clientid);
//1) Remove the file from the file system of the client
//2) Remove the file from the file system of all shared clients
UserFileSystem fs = getUserFSFromMapSynchronized(clientid);
if (fs == null)
{
throw new UserNotLoadedInMemoryException("User not loaded in memory :" + clientid);
}
bool delete = fs.deleteFileSynchronized(filename);
List <string> sharedClients = fs.getFileMetaDataCloneSynchronized(filename).sharedwithclients;
foreach (string sharedclient in sharedClients)
{
UserFileSystem fsShared = getUserFSFromMapSynchronized(sharedclient);
if (fsShared != null)
{
Logger.Debug("Removing file : " + filename + " from shared client fs : " + sharedclient);
fsShared.deleteSharedFileSynchronized(new SharedFile(clientid, filename));
}
else
{
Logger.Warn("The shared user file system is missing from the memory, see what happened");
}
}
return(delete);
}
public bool addFSToMapSynchronized(UserFileSystem fs, string clientid)
{
Logger.Debug ("Synchronized adding file system in map for client id : " + clientid);
lock (this.privateLock) {
this.clientToFileSystemMap.Add(clientid, fs);
return true;
}
}
/* Synchronized method to add user. Returns false if the user is already present
Otherwise creates an empty file system and adds that user with that empty file system.
*/
public bool addUserSynchronized(string clientid, string password, long versionNumber)
{
Logger.Debug ("Adding user with client id : " + clientid + " and password : "******" and version number :" + versionNumber
);
UserFileSystem fs = getUserFSFromMapSynchronized (clientid);
if (fs != null) {
return false;
} else {
Logger.Debug ("User : "******" present in map, adding");
UserMetaData md = new UserMetaData(clientid, password, versionNumber,0);
UserFileSystem filesystem = new UserFileSystem(md);
addFSToMapSynchronized(filesystem, clientid);
}
return true;
}
/*
* This Function is to be Called when a Entire User Needs to be Moved
*/
public bool sendsynchUser(UserFileSystem file, OOBHandler oobhandle, Group group, List<Address> where)
{
try {
Logger.Debug ("File Operations Synch - sendsynchUser >> BEGIN");
bool operationResult = false;
string fileName = FileServerComm.getInstance ().transManager.generateTransactionId (file.metadata.clientId);
Transaction trans = new Transaction (fileName);
if (true == FileServerComm.getInstance ().transManager.insertTransaction (trans)) {
try {
MemoryMappedFile transferFile = null;
int writtenBytesLength = 0;
transferFile = oobhandle.serializeIntoMemoryMappedFile (fileName, file, ref writtenBytesLength);
OOBTransaction oobtrabs = new OOBTransaction (fileName, IsisSystem.GetMyAddress (), writtenBytesLength);
oobhandle.sendOOBData (group, transferFile, fileName, where);
trans.waitTillSignalled ();
operationResult = !trans.isTimedOut;
if (operationResult) {
group.OrderedSend (FileServerComm.UpdateUser, oobtrabs);
trans.waitTillSignalled ();
operationResult = !trans.isTimedOut;
}
FileServerComm.getInstance ().transManager.removeAndGetTransaction (fileName);
operationResult = !trans.isTimedOut;
} catch (Exception e) {
Logger.Debug ("Exception during File Operations Synch - sendsynchUser" + e.ToString ());
}
}
return operationResult;
} catch (Exception e) {
Logger.Debug ("File Operations Synch - sendsynchUser >> Encountered Exception : " + e.ToString());
return false;
}
}
public void SaveObjectSynchronized(UserFileSystem filesystem)
{
lock (privateLock) {
}
}
public void SaveObjectSynchronized(UserFileSystem filesystem)
{
lock (privateLock) {
}
}
//Merge the user file system
private UserFileSystem mergeUserFileSystems(UserFileSystem newfs, UserFileSystem oldfs)
{
Logger.Debug ("Merging user file systems for user id : " + newfs.metadata.clientId);
/*
* Rule of Fight Club ( UserFile system merge)
*
* 1) User meta data- The one with higher version number wins, although it will be mostly the
* newer file system object since user meta data is always maintained in memory
*
* 2) SharedFileList - This will be picked from the newer file system object since we don't have versioning for it
* and it is maintained in the memory always
*
* 3) File map -
* a) If there is a new file which is not present in the old file system
* If its marked for deletion - Don't add it
* If its not marked for deletion - Add it
* b) If there is file present in the new file system which is also present in the old file system
* If the version number of the new file is higher
* If its marked for deletion in the new file system delete that file
* If its not marked for deletion, replace the file
* If its version number is lower
* TOO BAD
* c) If there are files which are not present in the new file system which are present in old file system
* Ideally this should not happen since the all file names will always remain in memory. In any case, take the file on disk.
*
*
*/
if (newfs.metadata.versionNumber >= oldfs.metadata.versionNumber) {
oldfs.metadata = newfs.metadata; //replace
} else {
Logger.Warn ("The version number for the new user metadata is lower than the old, FIX ME FIX ME");
}
oldfs.sharedFiles = newfs.sharedFiles; //replace the shared file list
//now iterate over the file map, don't f**k up man
foreach (KeyValuePair<string, UserFile> entry in newfs.filemap) {
UserFile newfile = entry.Value;
UserFile oldfile = null;
string filename = entry.Key;
if (oldfs.filemap.ContainsKey (filename)) {
oldfile = oldfs.filemap [filename];
}
if (oldfile == null) { //case when there is new file and NO old file
if (newfile.filemetadata.markedForDeletion == false) {
oldfs.addFileSynchronized (newfile);
} else {
Logger.Debug ("File found marked for deleting, skipping it : " + filename);
}
} else { // case where there is old file and new file
if (newfile.filemetadata.versionNumber >= oldfile.filemetadata.versionNumber) { //lets roll
if (newfile.filemetadata.markedForDeletion == true) { //remove this file now
Logger.Debug ("File marked for deletion, removing : " + filename);
oldfs.removeFromMap (filename); //this will decrement the size
} else {
//long sizediff = newfile.filemetadata.filesize - oldfile.filemetadata.filesize;
oldfs.filemap [filename] = newfile;
//oldfs.incrementTotalFileSystemSize (sizediff);
}
}
}
}
return oldfs;
}
//Merge the user file system
private UserFileSystem mergeUserFileSystems(UserFileSystem newfs, UserFileSystem oldfs)
{
Logger.Debug("Merging user file systems for user id : " + newfs.metadata.clientId);
/*
* Rule of Fight Club ( UserFile system merge)
*
* 1) User meta data- The one with higher version number wins, although it will be mostly the
* newer file system object since user meta data is always maintained in memory
*
* 2) SharedFileList - This will be picked from the newer file system object since we don't have versioning for it
* and it is maintained in the memory always
*
* 3) File map -
* a) If there is a new file which is not present in the old file system
* If its marked for deletion - Don't add it
* If its not marked for deletion - Add it
* b) If there is file present in the new file system which is also present in the old file system
* If the version number of the new file is higher
* If its marked for deletion in the new file system delete that file
* If its not marked for deletion, replace the file
* If its version number is lower
* TOO BAD
* c) If there are files which are not present in the new file system which are present in old file system
* Ideally this should not happen since the all file names will always remain in memory. In any case, take the file on disk.
*
*
*/
if (newfs.metadata.versionNumber >= oldfs.metadata.versionNumber)
{
oldfs.metadata = newfs.metadata; //replace
}
else
{
Logger.Warn("The version number for the new user metadata is lower than the old, FIX ME FIX ME");
}
oldfs.sharedFiles = newfs.sharedFiles; //replace the shared file list
//now iterate over the file map, don't f**k up man
foreach (KeyValuePair <string, UserFile> entry in newfs.filemap)
{
UserFile newfile = entry.Value;
UserFile oldfile = null;
string filename = entry.Key;
if (oldfs.filemap.ContainsKey(filename))
{
oldfile = oldfs.filemap [filename];
}
if (oldfile == null) //case when there is new file and NO old file
{
if (newfile.filemetadata.markedForDeletion == false)
{
oldfs.addFileSynchronized(newfile);
}
else
{
Logger.Debug("File found marked for deleting, skipping it : " + filename);
}
}
else // case where there is old file and new file
{
if (newfile.filemetadata.versionNumber >= oldfile.filemetadata.versionNumber) //lets roll
{
if (newfile.filemetadata.markedForDeletion == true) //remove this file now
{
Logger.Debug("File marked for deletion, removing : " + filename);
oldfs.removeFromMap(filename); //this will decrement the size
}
else
{
//long sizediff = newfile.filemetadata.filesize - oldfile.filemetadata.filesize;
oldfs.filemap [filename] = newfile;
//oldfs.incrementTotalFileSystemSize (sizediff);
}
}
}
}
return(oldfs);
}
void handleBootStrappingRequest(Group group, OOBHandler oobhandle, InMemoryFileSystem fileSystem, string requestName, Address recvdFrom)
{
if (state.currState == eBootStrapState.BootStrappingComplete)
{
Logger.Debug("handleBootStrappingRequest , Received from " + recvdFrom.ToStringVerboseFormat());
BootStrappingCheckPoint initialStage = null;
initialStage = new BootStrappingCheckPoint("Boot Strapping Begin", FileServerComm.BootStrapBegin,
IsisSystem.GetMyAddress(), SUCCESS,
0);
Logger.Debug("Sending a BootStrapping Begin , Response to " + recvdFrom.ToStringVerboseFormat());
group.RawP2PSend(recvdFrom, FileServerComm.BootStrapBegin, initialStage);
MemoryMappedFile transferFile = null;
int currentUserIndex = 0;
int numberOfUsersCurrentBatch = 0;
List <string> users = fileSystem.GetInMemoryUserList();
InMemoryFileSystem tempFileSystem = new InMemoryFileSystem(false);
//Yayy Lets Begin Doing Some Boot Strapping
try {
Logger.Debug("Number of Users to BootStrap and Send " + users.Count);
while (currentUserIndex < users.Count)
{
UserFileSystem userfilesys = fileSystem.GetClonedInMemoryUserFileSystem(users [currentUserIndex]);
numberOfUsersCurrentBatch++;
Logger.Debug("Adding User to the BootStrap : " + users[currentUserIndex]);
tempFileSystem.addFSToMapSynchronized(userfilesys, users [currentUserIndex]);
currentUserIndex++;
if (numberOfUsersCurrentBatch == BatchSize)
{
//Let's Make a OOB File and Transfer the Data
string currentFileName = FileServerComm.getInstance().transManager.generateTransactionId();
bool operationResult = false;
numberOfUsersCurrentBatch = 0;
Transaction trans = new Transaction(currentFileName);
FileServerComm.getInstance().transManager.insertTransaction(trans);
int writtenBytesLength = 0;
transferFile = oobhandle.serializeIntoMemoryMappedFile(currentFileName, tempFileSystem, ref writtenBytesLength);
BootStrappingCheckPoint continueBootStrap = null;
continueBootStrap = new BootStrappingCheckPoint(currentFileName, FileServerComm.BootStrapContinue,
IsisSystem.GetMyAddress(), SUCCESS,
writtenBytesLength);
List <Address> where = new List <Address>();
where.Add(recvdFrom);
where.Add(IsisSystem.GetMyAddress());
oobhandle.sendOOBData(group, transferFile, currentFileName, where);
trans.waitTillSignalled();
operationResult = !trans.isTimedOut;
if (operationResult)
{
group.RawP2PSend(recvdFrom, FileServerComm.BootStrapContinue, continueBootStrap);
trans.waitTillSignalled();
operationResult = !trans.isTimedOut;
}
else
{
Logger.Debug("Sending BootStraping Request Timed Out, Quit Out of BootStrapping partcicipation");
return;
}
tempFileSystem = new InMemoryFileSystem();
}
}
//Lets Throw out the Remaining Users
if (numberOfUsersCurrentBatch != 0)
{
string currentFileName = FileServerComm.getInstance().transManager.generateTransactionId();
Transaction trans = new Transaction(currentFileName);
FileServerComm.getInstance().transManager.insertTransaction(trans);
bool currentOperationResult = false;
int writtenBytesLength = 0;
transferFile = oobhandle.serializeIntoMemoryMappedFile(currentFileName, tempFileSystem, ref writtenBytesLength);
BootStrappingCheckPoint _continue = null;
_continue = new BootStrappingCheckPoint(currentFileName, FileServerComm.BootStrapContinue,
IsisSystem.GetMyAddress(), SUCCESS,
writtenBytesLength);
List <Address> where = new List <Address>();
where.Add(recvdFrom);
where.Add(IsisSystem.GetMyAddress());
oobhandle.sendOOBData(group, transferFile, currentFileName, where);
trans.waitTillSignalled();
currentOperationResult = !trans.isTimedOut;
if (currentOperationResult)
{
group.RawP2PSend(recvdFrom, FileServerComm.BootStrapContinue, _continue);
trans.waitTillSignalled();
currentOperationResult = !trans.isTimedOut;
}
else
{
Logger.Debug("Sending BootStraping Request Timed Out, Quit Out of BootStrapping partcicipation");
return;
}
tempFileSystem = new InMemoryFileSystem();
numberOfUsersCurrentBatch = 0;
}
Logger.Debug("Sending a Boot Strap End Response to " + recvdFrom.ToString());
BootStrappingCheckPoint finalStage = null;
finalStage = new BootStrappingCheckPoint("Yayyy Finally Done", FileServerComm.BootStrapEnd,
IsisSystem.GetMyAddress(), SUCCESS,
0);
group.RawP2PSend(recvdFrom, FileServerComm.BootStrapEnd, finalStage);
return;
} catch (Exception e) {
Logger.Debug("Caught an Exception : " + e.ToString());
BootStrappingCheckPoint _exception = null;
_exception = new BootStrappingCheckPoint(e.ToString(), FileServerComm.BootStrapException,
IsisSystem.GetMyAddress(), FAILURE,
0);
group.P2PSend(recvdFrom, FileServerComm.BootStrapException, _exception);
return;
}
}
else
{
Logger.Debug("Node is Not in the State of Boot Strapping, Ignore this Request and Keep Calm");
}
}
