public static String generateID()
{
lock (fileLock){
lastID++;
String idToUpdate = Convert.ToString(lastID);
idToUpdate = idToUpdate.Replace(" ", ""); //in case of any
Boolean idValid = false;
//Make sure that the id hasn't already been assigned to an online client (could occur if server restarted.
while (!idValid)
{
foreach (var entry in clients)
{
ClientHandler client = entry.Value;
if (client.getID().Equals(idToUpdate))
{
lastID++;
idToUpdate = Convert.ToString(lastID);
}
}
idValid = true;
}
updateIDFile(idToUpdate);
return(Convert.ToString(lastID));
}
}
public static void newConnection(ClientHandler newClient)
{
clients.Add(newClient.getID(), newClient);
Stock sampleStock = stock[0];
if ((clients.Count == 1) && (sampleStock.getOwner() == null))
{
sampleStock.setOwner(newClient);
}
}
public static void disconnectClient(ClientHandler disconnectingClient)
{
clients.Remove(disconnectingClient.getID());
if ((stock[0].getOwner() == disconnectingClient))
{
resetStock();
Console.WriteLine("Stock is now unowned, waiting for next connection");
}
}
public String connectionsToString()
{
StringBuilder result = new StringBuilder("[CONN]");
foreach (var entry in Market.clients)
{
ClientHandler client = entry.Value;
result.Append(" " + client.getID());
}
return(result.ToString());
}
//Updates the users of the current market
public static void updateMarket(String message)
{
object lockObject = new Object();
/*
* if (!(message.startsWith("[UPDATE]"))){
* if (!(message.startsWith("[CONN]"))){
* message = "[UPDATE] " + message;
* }
* }*/
Console.WriteLine("sending update to clients. Message: " + message);
lock (lockObject){
foreach (var entry in clients)
{
ClientHandler client = entry.Value;
Console.WriteLine("Sending to client: " + client.getID());
client.sendMessage(message);
}
}
}
//TODO doesnt work: may have to sync threads.
public static Boolean trade(ClientHandler oldOwner, ClientHandler newOwner, Stock stock)
{
Console.WriteLine(newOwner.getID() + " is in trade");
// UNCOMMENT FOR TESTING IF A TRADER DISCONNECTS MID-TRADE
/*
* try {
* Thread.sleep(10000);
* } catch (InterruptedException e) {
* e.printStackTrace();
* }
*/
lock (fileLock){
//ClientHandler oldOwner = stock.getOwner();
if (oldOwner == stock.getOwner())
{
//Check if the owner is also the buyer
if (stock.getOwner() == newOwner)
{
Console.WriteLine("stock owner: " + stock.getOwner().getID());
Console.WriteLine("new owner: " + newOwner.getID());
newOwner.sendMessage("Buy/Sell failed: cannot sell to owner.");
Console.WriteLine("There was an attempted trade of: " + stock.getName() + " but failed, because the owner tried to trade with themselves.");
return(false);
}
else
{
stock.setOwner(newOwner);
Console.WriteLine("new owner: " + stock.getOwner().getID());
//Check that new owner has been assigned
if (stock.getOwner() == newOwner)
{
if ((oldOwner.isConnected()) && (newOwner.isConnected())) //Check if traders are still connected before finalisation of trade.
{
String updateMsg = "[UPDATE]Stock is now owned by trader: " + Market.getStock("sample stock").getOwner().getID();
updateMarket(updateMsg);
return(true);
}
else
{
stock.setOwner(oldOwner);
Console.WriteLine("new owner offline");
return(false);
}
}
else
{
Console.WriteLine("Stock owner was unable to be changed.");
return(false);
}
}
}
else
{
Console.WriteLine("client: " + oldOwner.getID() + " tried to sell the stock, but are not the owner.");
return(false);
}
}
}
