Some Async Socket Code - Help with Garbage Collection?
- by divinci
Hi all,
I think this question is really about my understanding of Garbage collection and variable references. But I will go ahead and throw out some code for you to look at.
// Please note do not use this code for async sockets, just to highlight my question
// SocketTransport
// This is a simple wrapper class that is used as the 'state' object
// when performing Async Socket Reads/Writes
public class SocketTransport
{
public Socket Socket;
public byte[] Buffer;
public SocketTransport(Socket socket, byte[] buffer)
{
this.Socket = socket;
this.Buffer = buffer;
}
}
// Entry point - creates a SocketTransport, then passes it as the state
// object when Asyncly reading from the socket.
public void ReadOne(Socket socket)
{
SocketTransport socketTransport_One =
new SocketTransport(socket, new byte[10]);
socketTransport_One.Socket.BeginRecieve
(
socketTransport_One.Buffer, // Buffer to store data
0, // Buffer offset
10, // Read Length
SocketFlags.None // SocketFlags
new AsyncCallback(OnReadOne), // Callback when BeginRead completes
socketTransport_One // 'state' object to pass to Callback.
);
}
public void OnReadOne(IAsyncResult ar)
{
SocketTransport socketTransport_One = ar.asyncState as SocketTransport;
ProcessReadOneBuffer(socketTransport_One.Buffer); // Do processing
// New Read
// Create another! SocketTransport (what happens to first one?)
SocketTransport socketTransport_Two =
new SocketTransport(socket, new byte[10]);
socketTransport_Two.Socket.BeginRecieve
(
socketTransport_One.Buffer,
0,
10,
SocketFlags.None
new AsyncCallback(OnReadTwo),
socketTransport_Two
);
}
public void OnReadTwo(IAsyncResult ar)
{
SocketTransport socketTransport_Two = ar.asyncState as SocketTransport;
..............
So my question is:
The first SocketTransport to be created (socketTransport_One) has a strong reference to a Socket object (lets call is ~SocketA~).
Once the async read is completed, a new SocketTransport object is created (socketTransport_Two) also with a strong reference to ~SocketA~.
Q1. Will socketTransport_One be collected by the garbage collector when method OnReadOne exits? Even though it still contains a strong reference to ~SocketA~
Thanks all!
