/// <summary>
/// Initiates communication with a client and sends an InitAck message to it,
/// which contains a reference to <c>this</c>.
/// After that other ClientMessage messages can be sent to this worker
/// using the communication ID given in the received message.
/// </summary>
/// <param name="m">non-null message of type InitCommunication</param>
protected void processInitCommunication(Message m)
{
InitCommunication initC = (InitCommunication)m;
ongoingCommunications[initC.CommunicationId] = initC.Client;
initC.Client.Tell(new InitAck(this, initC.CommunicationId));
}
/// <summary>
/// In stopping mode, InitCommunication always fail, which is signal
/// using an OperationFailed message sent to the client.
/// In this mode, only StopAck-messages are expected and if all stop acknowledgements
/// have been collected, the Dispatcher stop itself.
/// </summary>
/// <param name="m">non-null message received</param>
private void Stopping(Message m)
{
if (m is InitCommunication)
{
InitCommunication initM = ((InitCommunication)m);
initM.Client.Tell(new OperationFailed(initM.CommunicationId));
}
else if (m is StopAck)
{
SimulatedActor actor = ((StopAck)m).Sender;
acksToCollect.Remove(actor.Id);
system.Stop(actor);
if (acksToCollect.Count == 0)
{
system.Stop(messageStore);
system.Stop(this);
}
}
}
/// <summary>
/// In normal operation messages are forwarded to workers.
/// A InitCommunication-messages are forwarded to one worker
/// which is selected based on the communication id set in the message.
/// The selection scheme is (if workers are numbered from 0 to n - 1)
/// selectworkernumber = communication % n, where a % b is the non-negative
/// remainder of the integer division a/b.
/// If a Stop message is sent, it is broadcast to all workers and the mode
/// is switched to STOPPING.
/// </summary>
/// <param name="m">non-null message received</param>
private void NormalOperation(Message m)
{
if (m is Stop)
{
foreach (Worker w in workers)
{
acksToCollect.Add(w.Id);
w.Tell(new Stop());
}
mode = Mode.STOPPING;
}
else if (m is InitCommunication)
{
// decide upon id for now, maybe switch to login credentials TODO
InitCommunication initC = ((InitCommunication)m);
int rnd = new Random((int)initC.CommunicationId).Next();
int index = (((rnd % workers.Count) + workers.Count) % workers.Count);
Worker w = workers[index];
w.Tell(m);
}
}
