public Stack(OptionNetworkInterface aOption)
{
iStatus = new StackStatus(EStackState.eStopped, null);
iStackStarted = false;
iInterface = null;
iOption = aOption;
iOption.EventValueChanged += InterfaceChanged;
}
private void StopStack()
{
if (iStatus.State != EStackState.eStopped)
{
Trace.WriteLine(Trace.kCore, "Stack.StopStack() stopping stack...");
UserLog.WriteLine(DateTime.Now + ": Linn.Stack stopping...");
if (iStackStarted && iStack != null)
{
iStack.Stop();
}
iStatus = new StackStatus(EStackState.eStopped, null);
iStackStarted = false;
iInterface = null;
Trace.WriteLine(Trace.kCore, "Stack.StopStack() stack stopped");
UserLog.WriteLine(DateTime.Now + ": Linn.Stack stop ok");
}
}
public EventArgsStackStatus(StackStatus aStatus)
{
Status = aStatus;
}
private void StartStack(NetworkInterface aInterface)
{
iInterface = aInterface;
iStackStarted = false;
switch (aInterface.Status)
{
case NetworkInterface.EStatus.eUnconfigured:
iStatus = new StackStatus(EStackState.eNoInterface, iInterface);
Trace.WriteLine(Trace.kCore, "Stack.StartStack() no configured interface");
UserLog.WriteLine(DateTime.Now + ": Linn.Stack start failed - no interface is configured");
break;
case NetworkInterface.EStatus.eUnavailable:
iStatus = new StackStatus(EStackState.eNonexistentInterface, iInterface);
Trace.WriteLine(Trace.kCore, "Stack.StartStack() configured interface error");
UserLog.WriteLine(DateTime.Now + ": Linn.Stack start failed - configured interface is unavailable " + iInterface.ToString());
break;
case NetworkInterface.EStatus.eAvailable:
try
{
Trace.WriteLine(Trace.kCore, "Stack.StartStack() starting...");
UserLog.WriteLine(DateTime.Now + ": Linn.Stack starting... " + iInterface.ToString());
if (iStack != null)
{
iStack.Start(iInterface.Info.IPAddress);
}
iStatus = new StackStatus(EStackState.eOk, iInterface);
iStackStarted = true;
Trace.WriteLine(Trace.kCore, "Stack.StartStack() OK");
UserLog.WriteLine(DateTime.Now + ": Linn.Stack start ok " + iInterface.ToString());
}
catch (Exception e)
{
iStatus = new StackStatus(EStackState.eBadInterface, iInterface);
iStackStarted = false;
Trace.WriteLine(Trace.kCore, "Stack.StartStack() failure: " + e.ToString());
Console.Write("Stack.StartStack() failure: " + e.ToString());
UserLog.WriteLine(DateTime.Now + ": Linn.Stack start failed " + iInterface.ToString());
UserLog.WriteLine("Error Message: " + e.Message);
UserLog.WriteLine("Error Message: " + e.ToString());
// stop the stack to cleanup any stack components that were started
if (iStack != null)
{
iStack.Stop();
}
}
break;
default:
Assert.Check(false);
break;
}
}
private void InterfaceChanged(object sender, EventArgs e)
{
StackStatus newStatus;
lock (this)
{
if (iStatus.State == EStackState.eStopped)
{
return;
}
// get the current interface from the option
NetworkInterface newInterface = iOption.Interface;
if (newInterface.Name == iInterface.Name &&
iInterface.Status == NetworkInterface.EStatus.eAvailable &&
newInterface.Status == NetworkInterface.EStatus.eUnavailable)
{
// the currently available configured interface has become unavailable e.g. gone into standby
// - do not stop the stack just yet as this will leave lingering subscriptions
iInterface = newInterface;
iStatus = new StackStatus(EStackState.eNonexistentInterface, iInterface);
Trace.WriteLine(Trace.kCore, "Stack.InterfaceChanged() interface unavailable");
UserLog.WriteLine(DateTime.Now + ": Linn.Stack interface now unavailable " + iInterface.ToString());
}
else if (newInterface.Name == iInterface.Name &&
iInterface.Status == NetworkInterface.EStatus.eUnavailable &&
newInterface.Status == NetworkInterface.EStatus.eAvailable)
{
// the currently unavailable configured interface has become available e.g. come out of standby
// - restart the stack
Trace.WriteLine(Trace.kCore, "Stack.InterfaceChanged() interface now available");
UserLog.WriteLine(DateTime.Now + ": Linn.Stack interface now available " + newInterface.ToString());
// now that the interface is available again, the stack can be stopped to cleanup existing
// subscriptions
StopStack();
// a pause for coming out of standby - on the PDA, even though it has a valid IP
// address, the interface is still not fully operational
System.Threading.Thread.Sleep(5000);
StartStack(newInterface);
}
else
{
// all other interface changes, including switching to a different physical interface
// just restart the stack
StopStack();
StartStack(newInterface);
}
newStatus = iStatus;
}
EventHandler <EventArgsStackStatus> ev = EventStatusChanged;
if (ev != null)
{
ev(this, new EventArgsStackStatus(newStatus));
}
}
