// Majordomo Protocol worker example
// Uses the mdwrk API to hide all MDP aspects
public static void MDWorker(string[] args)
{
bool verbose = (args.Any(e => e.ToLower().Equals("-v") ||
e.ToLower().Equals("--verbose")));
Console.WriteLine("Verbose: {0}", verbose);
CancellationTokenSource cts = new CancellationTokenSource();
Console.CancelKeyPress += (s, ea) =>
{
ea.Cancel = true;
cts.Cancel();
};
using (MajordomoWorker session = new MajordomoWorker("tcp://127.0.0.1:5555", "echo", verbose))
{
ZMessage reply = null;
while (true)
{
ZMessage request = session.Recv(reply, cts);
if (request == null)
{
break; // worker was interrupted
}
reply = request; // Echo is complex
}
}
}
// .split Titanic request service
// The {{titanic.request}} task waits for requests to this service. It writes
// each request to disk and returns a UUID to the client. The client picks
// up the reply asynchronously using the {{titanic.reply}} service:
private static void Titanic_Request(ZContext ctx, ZSocket backendpipe, CancellationTokenSource cancellor, object[] args)
{
using (MajordomoWorker worker = new MajordomoWorker("tcp://127.0.0.1:5555", "titanic.request", (bool)args[0]))
{
ZMessage reply = null;
while (true)
{
// Send reply if it's not null
// And then get next request from broker
ZMessage request = worker.Recv(reply, cancellor);
if (request == null)
{
break; // Interrupted, exit
}
// Ensure message directory exists
Directory.CreateDirectory(TitanicCommon.TITANIC_DIR);
// Generate UUID and save mesage to disk
Guid uuid = TitanicCommon.GenerateUuid();
string fn = TitanicCommon.RequestFilename(uuid);
request.SerializeToXml(fn);
request.Dispose();
// Send UUID through tho message queue
reply = new ZMessage();
reply.Add(new ZFrame(uuid.ToString()));
ZError error;
if (!backendpipe.Send(reply, out error))
{
if (error.Equals(ZError.ETERM))
{
break;
}
}
//backendpipe.Send(reply);
// Now send UUID back to client
// Done by the mdwrk_recv() at the top of the loop
reply = new ZMessage();
reply.Add(new ZFrame("200"));
reply.Add(new ZFrame(uuid.ToString()));
}
}
}
// Majordomo Protocol worker example
// Uses the mdwrk API to hide all MDP aspects
public static void MDWorker(string[] args)
{
CancellationTokenSource cts = new CancellationTokenSource();
Console.CancelKeyPress += (s, ea) =>
{
ea.Cancel = true;
cts.Cancel();
};
using (MajordomoWorker session = new MajordomoWorker("tcp://127.0.0.1:5555", "echo", Verbose))
{
ZMessage reply = null;
while (true)
{
ZMessage request = session.Recv(reply, cts);
if (request == null)
{
break; // worker was interrupted
}
reply = request; // Echo is complex
}
}
}
// .split Titanic close task
// The {{titanic.close}} task removes any waiting replies for the request
// (specified by UUID). It's idempotent, so it is safe to call more than
// once in a row:
private static void Titanic_Close(ZContext context, CancellationTokenSource cts, bool verbose)
{
using (var worker = new MajordomoWorker("tcp://127.0.0.1:5555", "titanic.close", verbose))
{
ZMessage reply = null;
while (true)
{
ZMessage request = worker.Recv(reply, cts);
if (request == null)
{
break;
}
var g = Guid.Parse(request.Pop().ReadString());
var reqfn = TitanicCommon.RequestFilename(g);
var repfn = TitanicCommon.ReplyFilename(g);
File.Delete(reqfn);
File.Delete(repfn);
request.Dispose();
reply = new ZMessage();
reply.Add(new ZFrame("200"));
}
}
}
// .split Titanic reply service
// The {{titanic.reply}} task checks if there's a reply for the specified
// request (by UUID), and returns a 200 (OK), 300 (Pending), or 400
// (Unknown) accordingly:
private static void Titanic_Reply(ZContext context, CancellationTokenSource cts, bool verbose)
{
using (var worker = new MajordomoWorker("tcp://127.0.0.1:5555", "titanic.reply", verbose))
{
ZMessage reply = null;
while (true)
{
var request = worker.Recv(reply, cts);
if (request == null)
{
break; // Interrupted, exit
}
var g = Guid.Parse(request.Pop().ReadString());
var reqfn = TitanicCommon.RequestFilename(g);
var repfn = TitanicCommon.ReplyFilename(g);
if (File.Exists(repfn))
{
reply = repfn.DeserializeFromXml <ZMessage>();
reply.Prepend(new ZFrame("200"));
}
else
{
reply = new ZMessage();
if (File.Exists(reqfn))
{
reply.Prepend(new ZFrame("300")); //Pending
}
else
{
reply.Prepend(new ZFrame("400")); //Unknown
}
}
request.Dispose();
}
}
}
public static void InitialiseWorker(String broker = "tcp://127.0.0.1:5555",
String service = "testservice")
{
Task.Factory.StartNew(() =>
{
var worker = new MajordomoWorker(broker, service);
worker.Work();
}, Canceller.Token);
}
