private void acceptConnection()
{
/*Pre: the listenOnPort method created a thread.*/
/*Post:the method will continually look for new connections*/
listening = true;
ClientControl.addReferenceToMainController(this);
ClientControl.addReferenceToView(this.view);
while (listening == true)
{
//blocking - the socket starts listening
tcpServer.Listen(int.MaxValue);
try
{
//wait for connection attempted, store socket info inside tryToConnect
Socket tryToConnect = tcpServer.Accept();
//if number of clients does not exceed MAXCLIENTS
int numClients = clientList.Count;
if (numClients < MAXCLIENTS && tryToConnect != null)
{
//create new client
ClientControl client = new ClientControl(tryToConnect, (r.Next(10000) + r.Next(10)));
//and add client object to linked list
clientList.AddLast(client);
//tell main view that client was added
view.Invoke(view.writeToStatusTextBox, "Client: "+ client.clientThread.Name +" added.");
}
else
{
//otherwise tell main view client was not added
view.Invoke(view.writeToStatusTextBox, "Client could not be added.");
//create new network stream
NetworkStream ntwkstrm = new NetworkStream(tryToConnect);
ASCIIEncoding encode = new ASCIIEncoding();
byte[] sendBytes = new byte[4];
//read anything already on stream
ntwkstrm.Read(sendBytes, 0, 4);
//send last client BUSY signal
sendBytes = encode.GetBytes("BUSY");
ntwkstrm.Write(sendBytes, 0, sendBytes.Length);
//close network stream
ntwkstrm.Flush();
ntwkstrm.Close();
}
}
catch (SocketException se)
{
//if socket fails close it
if (tcpServer != null)
tcpServer.Close();
//and abort thread
if (listeningOnPort != null)
listeningOnPort.Abort();
}
catch (ThreadAbortException tae)
{
//if thread is attempted to abort check if socket is closed if not close it.
if (tcpServer != null)
tcpServer.Close();
//then remove all clients
for (int i = clientList.Count; i>0; i--)
clientList.RemoveFirst();
}
catch (Exception e)
{
}
}
}
public void makeBid(string xml, ClientControl cle)
{
try
{
//client attempts to bid on item
XmlDocument doc = new XmlDocument();
StringReader red = new StringReader(xml);
doc.Load(red);
XmlElement root = doc.DocumentElement;
//read item id and bid ammount from xml string
string id = root.SelectSingleNode("itemID").InnerText;
string bid = root.SelectSingleNode("amount").InnerText;
//attempt to get auction item from id
Model.AuctionItem temp = this.listOItems.getItemByID(Int32.Parse(id));
//creates new bid
Model.Bid newBid = new AuctionServer.Model.Bid(Int32.Parse(cle.clientThread.Name), temp, float.Parse(bid));
//attempt to bid on item
if (temp.setCurrentHighBid(newBid))
view.Invoke(view.writeToStatusTextBox, newBid.ToString());
else
view.Invoke(view.writeToStatusTextBox, "Client: " + cle.clientThread.Name + " was UNSUCCESSFUL.");
}
catch (FormatException fe)
{
view.Invoke(view.writeToStatusTextBox, "FormatException in ServerControl.makeBid(string, ClientControl) with: " +fe.Message);
}
catch (/*SomeKindOf*/Exception e)
{
view.Invoke(view.writeToStatusTextBox, "Exception in ServerControl.makeBid(string, ClientControl) with: " + e.Message);
}
}
public void removeClient(ClientControl removeThisClient)
{
/*Pre: a client object to be removed is supplied*/
/*Post:the client object has been removed from the linked list making room for other clients*/
try
{
//if client object is in the list
if (clientList.Contains(removeThisClient))
{
//remove the object from the list
clientList.Remove(removeThisClient);
view.Invoke(view.writeToStatusTextBox, "Client: "+ removeThisClient.clientThread.Name +" removed.");
}
}
catch (ArgumentException ae)
{
//if a bad argument was supplied tell the main view what caused it
if (view != null)
view.Invoke(view.writeToStatusTextBox, "Argument exception in RemoveClient StreamingServer: " + ae.Message);
}
}
public byte[] getAuctionItemsAsBytes(ClientControl client)
{
/*Returns auction item at position i as bytes where every
*item field is seperated by a two byte int16 containing
*the length of the next field.
*/
try
{
//creates an XML file containg all auction items to be sent to specific client
LinkedListNode<Model.AuctionItem> temp = this.listOItems.getItemFirstNode();
Model.AuctionItem work;
//add root node tag
string outString = "<Auction>";
for (int i = 0; i < this.listOItems.getNumberOfItems(); i++)
{
work = temp.Value;
//add item node tag
outString += "<item>";
//get AuctionItem XML string
outString += work.makeXMLNode();
//open status tag
outString += "<status>";
//determine status of auction item for specific client
if (work.getCurrentHighBid().getClient().ToString() == "-1")
{
if (work.getClosingTime() < DateTime.Now)
{
outString += "This auction is over. No one won this item.";
}
else
{
outString += "This auction is not over. No one has bid yet.";
}
}
else if (work.getCurrentHighBid().getClient().ToString() == client.clientThread.Name)
{
if (work.getClosingTime() < DateTime.Now)
{
outString += "This auction is over. You won this item.";
}
else
{
outString += "This auction is not over. You are the highest bidder.";
}
}
else
{
if (work.getClosingTime() < DateTime.Now)
{
outString += "This auction is over. You lost this item.";
}
else
{
outString += "This auction is not over. You are not the highest bidder.";
}
}
//close status tag and item node
outString += "</status>";
outString += "</item>";
//next auction item
temp = temp.Next;
}
//close Auction root node
outString += "</Auction>";
//view.Invoke(view.writeToStatusTextBox, "Sending: "+outString);
//return byte[] of XML string
byte[] packet = encode.GetBytes(outString);
return packet;
}
catch (NullReferenceException nre)
{
//if null reference exception occured return byte[] with error string.
string error = nre.ToString();
byte[] errorPacket = new byte[error.Length];
encode.GetBytes(error.ToCharArray(), 0, error.Length, errorPacket, 0);
return errorPacket;
}
catch (Exception e)
{
//if exception occured return byte[] with error string
string error = e.ToString();
byte[] errorPacket = new byte[error.Length];
encode.GetBytes(error.ToCharArray(), 0, error.Length, errorPacket, 0);
return errorPacket;
}
}
