/// <summary>
/// Sends a message to another component
/// </summary>
/// <param name="address">The destination address of the message</param>
/// <param name="message">The message to send</param>
public void SendMessage(Message message)
{
// Enqueue the message for processing by Dispatch threads
messages.Enqueue(message);
}
/// <summary>
/// Attempts to route the specified message
/// </summary>
/// <remarks>The server should check if the target of this message is a remote component and
/// if not, attempt to discover it. Any exception thrown by this message will be used to
/// return an error message to the sender</remarks>
/// <param name="m">The message to route</param>
public void RouteMessage(Message m)
{
RemoteComponent rc = remoteComponents[m.Target];
string scheme = rc.Address.Substring(0, rc.Address.IndexOf(':'));
if (!protocols.ContainsKey(scheme))
{
string msg = "Invalid Scheme (" + scheme + "), could not find matching protocol handler";
log.Error("[RouteMessage] " + msg);
throw new InvalidOperationException(msg);
}
IProtocol protocol = protocols[scheme];
protocol.Send(m, rc.Address);
log.Info("[RouteMessage] Message for component \"" + m.Target + "\" routed to: " + rc.Address);
}
/// <summary>
/// Dispatches the specified control message
/// </summary>
/// <param name="m">A control message to dispatch</param>
public object DispatchControl(Message m)
{
object r = null;
switch (m.Action.ToUpper())
{
case "ADDRECIEVER":
AddReciever();
log.Info("[Dispatch] AddReciever");
return null;
case "REMOVERECIEVER":
RemoveReciever();
log.Info("[Dispatch] RemoveReciever");
return null;
case "ADDDISPATCHER":
AddDispatcher();
log.Info("[Dispatch] AddDispatcher");
return null;
case "REMOVEDISPATCHER":
RemoveDispatcher();
log.Info("[Dispatch] RemoveDispatcher");
return null;
case "GETRTHREADCOUNT":
r = (object)GetRThreadCount();
log.Info("[Dispatch] GetRThreadCount");
return r;
case "GETDTHREADCOUNT":
r = (object)GetDThreadCount();
log.Info("[Dispatch] GetDThreadCount");
return r;
case "REGISTERCOMPONENT":
RegisterComponent((RemoteComponent)m.Arguments[0]);
log.Info("[Dispatch] RegisterComponent");
return null;
case "UNREGISTERCOMPONENT":
UnregisterComponent((string)m.Arguments[0]);
log.Info("[Dispatch] UnregisterComponent");
return null;
case "RESOLVECONTRACT":
r = (object)ResolveContract((string)m.Arguments[0]);
log.Info("[Dispatch] ResolveContract");
return r;
case "GETNAME":
log.Info("[Dispatch] GetName");
return name;
case "SENDMESSAGE":
SendMessage((Message)m.Arguments[0]);
log.Info("[Dispatch] SendMessage");
return null;
}
return null;
}
private void RecieveLoop()
{
// Start at 0
int i = 0;
if (protocols.Count == 0)
return;
Monitor.Enter(locker);
while (!stop)
{
// Setup variables
Message m = null;
IProtocol p = null;
// Lock the protocol list and get a protocol
Monitor.Enter(protocols);
p = protocols[i];
Monitor.Exit(protocols);
// Recieve a Message
m = p.Recieve();
if (m != null)
{
// TODO: Use log4net Nested Diagnostic Context to log messages that occur during the processing of a message
// If the target is local, enqueue the message
if (server.Manager.Contains(m.Target))
server.Messages.Enqueue(m);
// If the target is remote, or we can discover it, route the message
else if ((server.RemoteComponents.ContainsKey(m.Target)) || (server.Discover(m.Target)))
server.SendMessage(m);
// Otherwise, if we don't know the component, we can't recieve the message
else
{
// Log the error
string message = "Unable to locate target component (" + m.Target + ") for this message";
log.Error(message);
// If we do know how to reach the sender (i.e. its local or known remote)
if ((server.Manager.Contains(m.Sender)) || (server.RemoteComponents.ContainsKey(m.Sender)))
{
// Create an exception message and send it with the same RefId but with our server name as the sender
Message err = new Message("ERR", m.Sender, "SRV:" + server.Name);
err.Arguments.Add(new NullReferenceException(message));
err.Type = MessageTypeEnum.Exception;
err.RefId = m.RefId;
server.SendMessage(err);
}
// Don't log that we recieved the message
continue;
}
log.Info("Message Recieved by " + p.Scheme + " protocol");
}
// If we are on the last protocol, go back to 0
if (i == (protocols.Count - 1))
i = 0;
// Otherwise, move on to the next protocol
else
i++;
// Let others modify the stop flag
Monitor.Wait(locker);
}
}
/// <summary>
/// Adds the specified message to the queue
/// </summary>
/// <param name="msg">The message to add to the queue</param>
public void Enqueue(Message msg)
{
// Add message to appropriate sub-queue
switch (msg.Priority)
{
case MessagePriorityEnum.Low:
lock(locker)
lowQueue.Enqueue(msg);
return;
case MessagePriorityEnum.Normal:
lock(locker)
midQueue.Enqueue(msg);
return;
case MessagePriorityEnum.High:
lock(locker)
highQueue.Enqueue(msg);
return;
}
}
/// <summary>
/// Sends a message to another component
/// </summary>
/// <param name="address">The destination address of the message</param>
/// <param name="message">The message to send</param>
public void SendMessage(Message message)
{
if (manager.Contains(message.Target))
{
messages.Enqueue(message);
}
else if (remoteComponents.ContainsKey(message.Target))
{
RemoteComponent rc = remoteComponents[message.Target];
string scheme = rc.Address.Substring(0, rc.Address.IndexOf(':'));
if (!protocols.ContainsKey(scheme))
{
string msg = "Invalid Scheme (" + scheme + "), could not find matching protocol handler";
log.Error("[SendMessage] " + msg);
throw new InvalidDataException(msg);
}
IProtocol protocol = protocols[scheme];
protocol.Send(message, rc.Address);
log.Info("[SendMessage] Message for component \"" + message.Target + "\" routed to: " + rc.Address);
}
else
{
log.Error("[SendMessage] Unable to send message to component: " + message.Target + ", component is not registered or attached");
}
}