//Begins an Asynchronous read from a specific client's network stream. This function handles
//reading in header information that defines the size of the object, and then invokes a callback
//which will handle reading and deserializing the actual object.
public void BeginRead(onReadEventHandler callback, int clientNumber)
{
if (m_listener != null)
{
try
{
//Set a callback to notify the user of a succsesful read, once we've finished with
//our part.
onReadUserCallback = callback;
//ServerReadInfo will hold the id of the client who we're reading from, and an empty
//array to read into.
ServerReadInfo header = new ServerReadInfo();
header.Id = clientNumber;
header.Data = new Byte[4];
//Set reading to true. The caller has to use an if to check if we're reading before
//calling this function. Note: Maybe the if can be done in this class? I wasn't sure
//it as appropriate to take away that control.
m_clients[clientNumber].Reading = true;
//Read the data into our header object and send the instance of that object to the
//onRead header local callback.
m_clients[clientNumber].Stream.BeginRead(header.Data, 0, 4, onReadHeaderLocalCallback, header);
}
catch (Exception e)
{
throw e;
}
}
}
//This function is triggered by an event when a header is successfully read.
private void onReadHeader(IAsyncResult ar)
{
try
{
//Cast the object which we send from "BeginRead" (which is stored in the
//IAsyncResult as "AsyncState", which I think is a stupid name because
//the object is not a "state" at all)...whatever
ServerReadInfo header = (ServerReadInfo)ar.AsyncState;
int objectSize = BitConverter.ToInt32(header.Data, 0);
//Got the objectSize stored in a new int, and the id is obviously the same,
//so we set the byte array in "header" to a new Byte array with the size of
//the object so we can basically reuse this object.
header.Data = new Byte[objectSize];
//End the current read
m_clients[header.Id].Stream.EndRead(ar);
//Begin a new Async read now that we know the size of the object. Store it
//again in the data field of "header" and send the "header" object to the
//final callback.
m_clients[header.Id].Stream.BeginRead(header.Data, 0, objectSize, onReadLocalCallback, header);
}
catch (Exception e)
{
throw e;
}
}
//Begins an Asynchronous write to a specific client's network stream. This function handles
//writing of header information that defines the size of the object, and then invokes a callback
//which will handle serializing and writing the actual object.
public void BeginWrite(onWriteEventHandler callback, int clientNumber, object obj)
{
if (m_listener != null)
{
try
{
//I resused the ServerReadInfo class which contains the client's id and a byte array
//containing data to be written or read to or from the server. Here we will de-
//serialize the object that we want to write.
ServerReadInfo writeInfo = new ServerReadInfo();
writeInfo.Id = clientNumber;
writeInfo.Data = Serializer.Serializer.SerializeObject(obj);
//Store the size of our object in a Byte array.
Byte[] array = BitConverter.GetBytes(writeInfo.Data.Length);
onWriteUserCallback = callback;
//Set writing to true. The caller has to use an if to check if we're writing before
//calling this function.
m_clients[clientNumber].Writing = true;
//Write out the size of the object. Send the actual object to the onWrite header local callback
m_clients[clientNumber].Stream.BeginWrite(array, 0, array.Length, onWriteHeaderLocalCallback, writeInfo);
}
catch (Exception e)
{
throw e;
}
}
}
private void onWriteHeader(IAsyncResult ar)
{
try
{
//We've successfully written the size of the object. Now simply write the object
//which was passed to us in the AsyncState.
ServerReadInfo writeInfo = (ServerReadInfo)ar.AsyncState;
m_clients[writeInfo.Id].Stream.EndWrite(ar);
m_clients[writeInfo.Id].Stream.BeginWrite(writeInfo.Data, 0, writeInfo.Data.Length, onWriteLocalCallback, writeInfo.Id);
}
catch (Exception e)
{
throw e;
}
}
private void onRead(IAsyncResult ar)
{
//WTF: Okay, so this try and catch was falling into the catch and throwing an index
//out of bounds exception WHICH IT'S CLEARLY NOT because the function works fine
//without the try and catch, and it didn't even after I added the "if" statement
//below (labeled by a comment saying "//TEST"), which clearly prevents ANY sort of
//out of bounds id.
//try
//{
//Cast ar.StupidName as our ReadInfo so we can get the idea and object data
OnReadEventArgs eA = new OnReadEventArgs();
ServerReadInfo readObject = (ServerReadInfo)ar.AsyncState;
int id = readObject.Id;
//TEST
if (id > m_clients.Count - 1 || id < 0)
{
return;
}
//Deserialize the byte array to create an object. We're gonna store the object
//in our OnReadEventArgs along with the id to send back to the original caller.
eA.Obj = Serializer.Serializer.DeserializeByteArray(readObject.Data);
eA.ClientID = id;
//Done reading. The position of this assignment is actually very important in
//the async world, apparently.
m_clients[id].Reading = false;
m_clients[id].Stream.EndRead(ar);
//Invoke the User's callback
onReadUserCallback.Invoke(this, eA);
//}
/*catch (Exception e)
* {
* throw e;
* }*/
}