public void accessCriticalSection()
{
if (!(wantsToEnterCriticalSection() && isReady()))
{
return;
}
if (requestToCriticalSectionSend)
{
return;
}
requestToCriticalSectionSend = true;
writeToLog("I want enter Critical Section");
if (clients.Count == 0)
{
writeToLog("Entering critical section because no nodes to notify");
enteredCriticalSection();
return;
}
foreach (var client in clients)
{
client.Value.ackCriticalSection = false;
}
CriticalRequest newRequest = new CriticalRequest(++lamportCounter, stringId);
newRequest.ackSend = true;
addRequestToQueue(newRequest);
MessageLIS message = new MessageLIS('L', "");
message.setLamportCounter(lamportCounter);
sendMessageToAll(message);
}
private void sendACKToNextNode()
{
if (!criticalRequests.Any()) //Empty
{
return;
}
CriticalRequest request = criticalRequests.ElementAt(0);
if (request.ackSend == false) // Should be received message
{
writeToLog(string.Format("CS Access granted from me to node {0} ({1}) ", request.stringId, request.counter));
request.ackSend = true;
clients[request.stringId].sendMessage(new MessageLIS('A', "")); //Acknowledge CS
}
}
public void accessCriticalSection()
{
if (!(wantsToEnterCriticalSection() && isReady()))
return;
if (requestToCriticalSectionSend)
return;
requestToCriticalSectionSend = true;
writeToLog("I want enter Critical Section");
if(clients.Count == 0)
{
writeToLog("Entering critical section because no nodes to notify");
enteredCriticalSection();
return;
}
foreach (var client in clients)
{
client.Value.ackCriticalSection = false;
}
CriticalRequest newRequest = new CriticalRequest(++lamportCounter, stringId);
newRequest.ackSend = true;
addRequestToQueue(newRequest);
MessageLIS message = new MessageLIS('L', "");
message.setLamportCounter(lamportCounter);
sendMessageToAll(message);
}
private void addRequestToQueue(CriticalRequest request)
{
writeToLog("Added new CriticalRequest to queue " + request.stringId + " " + "(" + request.counter + ")");
criticalRequests.Add(request);
criticalRequests = criticalRequests.OrderByDescending(c => c.counter).ThenBy(c => c.stringId).ToList();//.ThenBy(c => c.ackSend);
}
/*
Lamport
A = Ack CS
F = Release CS
L = Lamport Request CS
Nodes manipulation
C = Conf recieved
D = Remove node
K = Connect to known node
J = Join request
N = new client to connect
Files manipulation
T = file request
*/
public void receivedMessage(MessageLIS message)
{
System.Windows.Application.Current.Dispatcher.Invoke(new Action(() => {
//writeToLog("Recieved message:" + message.messageType);
ClientConnection client;
if (clients.ContainsKey(message.stringId))
client = clients[message.stringId];
else if (clientsToConnect.ContainsKey(message.stringId))
client = clientsToConnect[message.stringId];
else
{
writeToLog("Recieved message from unknown node !!!" + message.stringId);
return;
}
if (message.messageType == 'J') // RequestJoin
{
writeToLog("New client wants to join " + message.messageData);
client.requestedToJoin = true;
client.stringId = message.messageData;
}
else if (message.messageType == 'K')
{
writeToLog("New clients wants to only connect " + message.messageData);
client.stringId = message.messageData;
clientsToConnect.Remove(message.stringId);
addClient(client);
waitingForConnectionsNumber--;
}
else if (message.messageType == 'C') // Configuration
{
writeToLog("Recieved configuration - "+ message.messageData);
var configs = message.messageData.Split('|');
lamportCounter = int.Parse(configs[0]);
waitingForConnectionsNumber += configs[1].Split(new char[] { ';' }, StringSplitOptions.RemoveEmptyEntries).Length;
}
else if (message.messageType == 'N') // New client to connect
{
var connectionInfo = message.messageData.Split(':');
writeToLog("Connecting to NODE " + message.messageData);
addNewClientConnection(connectionInfo[0], int.Parse(connectionInfo[1]), true);
}
else if (message.messageType == 'D')
{
writeToLog("Removing NODE (D) " + message.messageData);
removeClient(message.messageData);
}
else if (message.messageType == 'L') // Lamport Request CS
{
writeToLog(string.Format("CS Requested {0} ({1})", message.stringId, message.getLamportCounter()));
CriticalRequest newRequest = new CriticalRequest(message.getLamportCounter(), message.stringId);
addRequestToQueue(newRequest);
lamportCounter = Math.Max(lamportCounter, message.getLamportCounter());
}
else if (message.messageType == 'A') // Acknowledged CS
{
writeToLog(string.Format("CS Access granted to me from {0}", message.stringId));
client.ackCriticalSection = true;
//criticalRequests.Find()
}
else if (message.messageType == 'F') // Release CS
{
writeToLog(string.Format("CS Released {0} ", message.stringId));
criticalRequests.RemoveAll(c => c.stringId == message.stringId);
/*int requestIndex = criticalRequests.FindIndex(c => c.stringId == message.stringId);
if(requestIndex >= 0)
{
criticalRequests.RemoveAt(requestIndex);
}*/
}
else if (message.messageType == 'T') // Transfer File (Text Only)
{
writeToLog(string.Format("File recieved " + message.messageData));
string[] conf = message.messageData.Split(new char[] { '|' }, 3);
var path = Path.Combine(folderPath, conf[1]);
try
{
if (conf[0] == "D")
{
//Delete file
File.Move(path, path + myExtension);
File.Delete(path + myExtension);
}
else
{
//watcher.EnableRaisingEvents = false;
if (File.Exists(path))
File.Delete(path + myExtension);
File.WriteAllText(path+myExtension, conf[2]);
if(File.Exists(path))
{
File.Move(path, path + ".todelete" + myExtension);
File.Delete(path + ".todelete" + myExtension);
}
File.Move(path + myExtension, path);
//watcher.EnableRaisingEvents = true;
}
}
catch (Exception ex)
{
writeToLog(ex.ToString());
}
}
checkActions();
}));
}
private void addRequestToQueue(CriticalRequest request)
{
writeToLog("Added new CriticalRequest to queue " + request.stringId + " " + "(" + request.counter + ")");
criticalRequests.Add(request);
criticalRequests = criticalRequests.OrderByDescending(c => c.counter).ThenBy(c => c.stringId).ToList();//.ThenBy(c => c.ackSend);
}
/*
* Lamport
* A = Ack CS
* F = Release CS
* L = Lamport Request CS
*
*
* Nodes manipulation
* C = Conf recieved
* D = Remove node
* K = Connect to known node
* J = Join request
* N = new client to connect
*
* Files manipulation
* T = file request
*/
public void receivedMessage(MessageLIS message)
{
System.Windows.Application.Current.Dispatcher.Invoke(new Action(() => {
//writeToLog("Recieved message:" + message.messageType);
ClientConnection client;
if (clients.ContainsKey(message.stringId))
{
client = clients[message.stringId];
}
else if (clientsToConnect.ContainsKey(message.stringId))
{
client = clientsToConnect[message.stringId];
}
else
{
writeToLog("Recieved message from unknown node !!!" + message.stringId);
return;
}
if (message.messageType == 'J') // RequestJoin
{
writeToLog("New client wants to join " + message.messageData);
client.requestedToJoin = true;
client.stringId = message.messageData;
}
else if (message.messageType == 'K')
{
writeToLog("New clients wants to only connect " + message.messageData);
client.stringId = message.messageData;
clientsToConnect.Remove(message.stringId);
addClient(client);
waitingForConnectionsNumber--;
}
else if (message.messageType == 'C') // Configuration
{
writeToLog("Recieved configuration - " + message.messageData);
var configs = message.messageData.Split('|');
lamportCounter = int.Parse(configs[0]);
waitingForConnectionsNumber += configs[1].Split(new char[] { ';' }, StringSplitOptions.RemoveEmptyEntries).Length;
}
else if (message.messageType == 'N') // New client to connect
{
var connectionInfo = message.messageData.Split(':');
writeToLog("Connecting to NODE " + message.messageData);
addNewClientConnection(connectionInfo[0], int.Parse(connectionInfo[1]), true);
}
else if (message.messageType == 'D')
{
writeToLog("Removing NODE (D) " + message.messageData);
removeClient(message.messageData);
}
else if (message.messageType == 'L') // Lamport Request CS
{
writeToLog(string.Format("CS Requested {0} ({1})", message.stringId, message.getLamportCounter()));
CriticalRequest newRequest = new CriticalRequest(message.getLamportCounter(), message.stringId);
addRequestToQueue(newRequest);
lamportCounter = Math.Max(lamportCounter, message.getLamportCounter());
}
else if (message.messageType == 'A') // Acknowledged CS
{
writeToLog(string.Format("CS Access granted to me from {0}", message.stringId));
client.ackCriticalSection = true;
//criticalRequests.Find()
}
else if (message.messageType == 'F') // Release CS
{
writeToLog(string.Format("CS Released {0} ", message.stringId));
criticalRequests.RemoveAll(c => c.stringId == message.stringId);
/*int requestIndex = criticalRequests.FindIndex(c => c.stringId == message.stringId);
* if(requestIndex >= 0)
* {
* criticalRequests.RemoveAt(requestIndex);
* }*/
}
else if (message.messageType == 'T') // Transfer File (Text Only)
{
writeToLog(string.Format("File recieved " + message.messageData));
string[] conf = message.messageData.Split(new char[] { '|' }, 3);
var path = Path.Combine(folderPath, conf[1]);
try
{
if (conf[0] == "D")
{
//Delete file
File.Move(path, path + myExtension);
File.Delete(path + myExtension);
}
else
{
//watcher.EnableRaisingEvents = false;
if (File.Exists(path))
{
File.Delete(path + myExtension);
}
File.WriteAllText(path + myExtension, conf[2]);
if (File.Exists(path))
{
File.Move(path, path + ".todelete" + myExtension);
File.Delete(path + ".todelete" + myExtension);
}
File.Move(path + myExtension, path);
//watcher.EnableRaisingEvents = true;
}
}
catch (Exception ex)
{
writeToLog(ex.ToString());
}
}
checkActions();
}));
}
