// ---------------------------------------------------------------------
// This is our client task
// It connects to the server, and then sends a request once per second
// It collects responses as they arrive, and it prints them out. We will
// run several client tasks in parallel, each with a different random ID.
public static void ClientTask()
{
using (var context = ZmqContext.Create())
{
using (ZmqSocket client = context.CreateSocket(SocketType.DEALER))
{
// Generate printable identity for the client
ZHelpers.SetID(client, Encoding.Unicode);
string identity = Encoding.Unicode.GetString(client.Identity);
client.Connect("tcp://localhost:5570");
client.ReceiveReady += (s, e) =>
{
var zmsg = new ZMessage(e.Socket);
Console.WriteLine("{0} : {1}", identity, zmsg.BodyToString());
};
int requestNumber = 0;
var poller = new Poller(new List<ZmqSocket> { client });
while (true)
{
// Tick once per second, pulling in arriving messages
for (int centitick = 0; centitick < 100; centitick++)
{
poller.Poll(TimeSpan.FromMilliseconds(10000));
}
var zmsg = new ZMessage("");
zmsg.StringToBody(String.Format("request: {0}", ++requestNumber));
zmsg.Send(client);
}
}
}
}
// ---------------------------------------------------------------------
// This is our client task
// It connects to the server, and then sends a request once per second
// It collects responses as they arrive, and it prints them out. We will
// run several client tasks in parallel, each with a different random ID.
public static void ClientTask()
{
using (var context = ZmqContext.Create())
{
using (ZmqSocket client = context.CreateSocket(SocketType.DEALER))
{
// Generate printable identity for the client
string identity = ZHelpers.SetID(client, Encoding.Unicode);
//client.Connect("tcp://localhost:5570");
string serviceRepoAddress = ConfigurationSettings.AppSettings["serviceRepoAddressZMQ"];
client.Connect(serviceRepoAddress);
client.ReceiveReady += (s, e) =>
{
var zmsg = new ZMessage(e.Socket);
Console.WriteLine("{0} : {1}", identity, zmsg.BodyToString());
};
int requestNumber = 0;
var poller = new Poller(new List<ZmqSocket> { client });
var zmsg2 = new ZMessage("");
JSONMessage jsonMess = new JSONMessage();
jsonMess.Service = "Klient";
jsonMess.Function = "RegisterService";
jsonMess.Parameters = new string[] { "Klient", "Location", "binding" };
string json = JsonConvert.SerializeObject(jsonMess);
zmsg2.StringToBody(json);
zmsg2.Send(client);
while (true)
{
// Tick once per second, pulling in arriving messages
for (int centitick = 0; centitick < 100; centitick++)
{
poller.Poll(TimeSpan.FromMilliseconds(10));
}
var zmsg = new ZMessage("");
jsonMess = new JSONMessage();
jsonMess.Service = "Klient";
jsonMess.Function = "GetServiceLocation";
jsonMess.Parameters = new string[] { "Klient", "binding" };
json = JsonConvert.SerializeObject(jsonMess);
zmsg.StringToBody(json);
zmsg.Send(client);
}
}
}
}
static void Main(string[] args)
{
using (var context = ZmqContext.Create())
{
using (var worker = context.CreateSocket(SocketType.REQ))
{
var randomizer = new Random(DateTime.Now.Millisecond);
var identity = ZHelpers.SetID(worker, Encoding.Unicode);
worker.Connect("tcp://localhost:5556");
Console.WriteLine("I: {0} worker ready", identity);
worker.Send("READY", Encoding.Unicode);
var cycles = 0;
while (true)
{
var zmsg = new ZMessage(worker);
cycles += 1;
if (cycles > 3 && randomizer.Next(0, 5) == 0)
{
Console.WriteLine("I: {0} simulating a crash", identity);
break;
}
else if (cycles > 3 && randomizer.Next(0, 5) == 0)
{
Console.WriteLine("I: {0} simulating CPU overload", identity);
System.Threading.Thread.Sleep(3000);
}
Console.WriteLine("I: {0} normal reply", identity);
System.Threading.Thread.Sleep(1000);
zmsg.Send(worker);
}
}
}
}
// Accept a request and reply with the same text a random number of
// times, with random delays between replies.
private static void ServerWorker(object context)
{
var randomizer = new Random(DateTime.Now.Millisecond);
using (ZmqSocket worker = ((ZmqContext)context).CreateSocket(SocketType.DEALER))
{
worker.Connect("inproc://backend");
while (true)
{
// The DEALER socket gives us the address envelope and message
var zmsg = new ZMessage(worker);
// Send 0..4 replies back
int replies = randomizer.Next(5);
for (int reply = 0; reply < replies; reply++)
{
Thread.Sleep(randomizer.Next(1, 1000));
zmsg.Send(worker);
}
}
}
}
// ---------------------------------------------------------------------
// This is our server task
// It uses the multithreaded server model to deal requests out to a pool
// of workers and route replies back to clients. One worker can handle
// one request at a time but one client can talk to multiple workers at
// once.
private static void ServerTask()
{
var workers = new List<Thread>(5);
using (var context = ZmqContext.Create())
{
using (ZmqSocket frontend = context.CreateSocket(SocketType.ROUTER), backend = context.CreateSocket(SocketType.DEALER))
{
frontend.Bind("tcp://*:5570");
backend.Bind("inproc://backend");
for (int workerNumber = 0; workerNumber < 5; workerNumber++)
{
workers.Add(new Thread(ServerWorker));
workers[workerNumber].Start(context);
}
// Switch messages between frontend and backend
frontend.ReceiveReady += (s, e) =>
{
var zmsg = new ZMessage(e.Socket);
zmsg.Send(backend);
};
backend.ReceiveReady += (s, e) =>
{
var zmsg = new ZMessage(e.Socket);
zmsg.Send(frontend);
};
var poller = new Poller(new List<ZmqSocket> { frontend, backend });
while (true)
{
poller.Poll();
}
}
}
}
public static void Main(string[] args)
{
var workers = new List<Thread>();
var clients = new List<Thread>();
// Prepare our context and sockets
using (var ctx = ZmqContext.Create())
{
using (ZmqSocket frontend = ctx.CreateSocket(SocketType.ROUTER), backend = ctx.CreateSocket(SocketType.ROUTER))
{
frontend.Bind("tcp://*:5555");
backend.Bind("tcp://*:5556");
int clientId;
for (clientId = 0; clientId < Program.clients; clientId++)
{
clients.Add(new Thread(ClientTask));
clients[clientId].Start();
}
for (int workerId = 0; workerId < Program.workers; workerId++)
{
workers.Add(new Thread(WorkerTask));
workers[workerId].Start();
}
// Logic of LRU loop
// - Poll backend always, frontend only if 1+ worker ready
// - If worker replies, queue worker as ready and forward reply
// to client if necessary
// - If client requests, pop next worker and send request to it
// Queue of available workers
var workerQueue = new Queue<byte[]>();
// Handle worker activity on backend
backend.ReceiveReady += (socket, revents) =>
{
var zmsg = new ZMessage(revents.Socket);
// Use worker address for LRU routing
workerQueue.Enqueue(zmsg.Unwrap());
// Forward message to client if it's not a READY
if (!Encoding.Unicode.GetString(zmsg.Address).Equals("READY"))
{
zmsg.Send(frontend);
}
};
frontend.ReceiveReady += (socket, revents) =>
{
// Now get next client request, route to next worker
// Dequeue and drop the next worker address
var zmsg = new ZMessage(revents.Socket);
zmsg.Wrap(workerQueue.Dequeue(), new byte[0]);
zmsg.Send(backend);
};
var poller = new Poller(new List<ZmqSocket>{ frontend, backend });
while (true)
{
//int rc = context.Poller(workerQueue.Count > 0
// ? new List<ZmqSocket>(new ZmqSocket[] {frontend, backend})
// : new List<ZmqSocket>(new ZmqSocket[] {backend}));
int rc = poller.Poll();
if (rc == -1)
{
break;
}
}
}
}
}
private static void WorkerTask()
{
using (var ctx = ZmqContext.Create())
{
using (var worker = ctx.CreateSocket(SocketType.REQ))
{
ZHelpers.SetID(worker, Encoding.Unicode);
worker.Connect("tcp://localhost:5556");
// Tell broker we're ready for work
worker.Send("READY", Encoding.Unicode);
while (true)
{
var zmsg = new ZMessage(worker);
Console.WriteLine("Worker: {0}", Encoding.Unicode.GetString(zmsg.Body));
zmsg.StringToBody("OK");
zmsg.Send(worker);
}
}
}
}
// ---------------------------------------------------------------------
// This is our server task
// It uses the multithreaded server model to deal requests out to a pool
// of workers and route replies back to clients. One worker can handle
// one request at a time but one client can talk to multiple workers at
// once.
private static void ServerTask()
{
var workers = new List<Thread>(5);
using (var context = ZmqContext.Create())
{
using (ZmqSocket frontend = context.CreateSocket(SocketType.ROUTER), backend = context.CreateSocket(SocketType.DEALER))
{
frontend.Bind("tcp://*:5570");
backend.Bind("inproc://backend");
for (int workerNumber = 0; workerNumber < 5; workerNumber++)
{
workers.Add(new Thread(ServerWorker));
workers[workerNumber].Start(context);
}
// Switch messages between frontend and backend
frontend.ReceiveReady += (s, e) =>
{
var zmsg = new ZMessage(e.Socket);
zmsg.Send(backend);
};
backend.ReceiveReady += (s, e) =>
{
var zmsg = new ZMessage(e.Socket);
string lol = zmsg.BodyToString();
JSONMessage m = JsonConvert.DeserializeObject<JSONMessage>(lol);
if (m.Function != null)
{
switch (m.Function)
{
case "RegisterService":
Console.WriteLine("ZEROMQ RegisterService: " + m.Parameters[0] + ";" + m.Parameters[1] + ";" + m.Parameters[2]);
m.ReponseString = "OK";
Repository.RegisterService(m.Parameters[0], m.Parameters[1], m.Parameters[2]);
break;
case "GetServiceLocation":
Console.WriteLine("ZEROMQ GetServiceLocation: " + m.Parameters[0] + ";" + m.Parameters[1]);
string locat = Repository.GetServiceLocation(m.Parameters[0], m.Parameters[1]);
m.ReponseString = locat;
break;
case "Alive":
Console.WriteLine("ZEROMQ Alive: " + ";" + m.Parameters[0] + m.Parameters[1]);
Repository.Alive(m.Parameters[0], m.Parameters[1]);
m.ReponseString = "OK";
break;
case "Unregister":
Console.WriteLine("ZEROMQ Unregister: " + ";" + m.Parameters[0] + m.Parameters[1]);
Repository.Unregister(m.Parameters[0], m.Parameters[1]);
m.ReponseString = "OK";
break;
default:
Console.WriteLine("Unknown: " + m.Function);
break;
}
}
m.Service = "IServiceRepository";
string json = JsonConvert.SerializeObject(m);
zmsg.StringToBody(json);
zmsg.Send(frontend);
};
var poller = new Poller(new List<ZmqSocket> { frontend, backend });
while (true)
{
poller.Poll();
}
}
}
}
static void Main(string[] args)
{
using (var context = ZmqContext.Create())
{
int interval = INTERVAL_INIT;
int liveness = HEARTBEAT_LIVENESS;
while (true)
{
int cylces = 0;
using (ZmqSocket worker = ConnectWorker(context))
{
worker.ReceiveReady += (socket, revents) =>
{
var zmsg = new ZMessage(revents.Socket);
byte[] identity = zmsg.Unwrap();
switch (Encoding.Unicode.GetString(zmsg.Address))
{
case PPP_HEARTBEAT:
interval = INTERVAL_INIT;
liveness = HEARTBEAT_LIVENESS;
break;
default:
if (zmsg.FrameCount > 1)
{
if (!doTheWork(cylces++))
{
break;
}
interval = INTERVAL_INIT;
liveness = HEARTBEAT_LIVENESS;
Console.WriteLine("W: work completed");
zmsg.Send(worker);
}
else
{
Console.WriteLine("E: invalied message {0}", identity);
}
break;
};
};
//Send out heartbeats at regular intervals
DateTime heartbeat_at = DateTime.Now.AddMilliseconds(HEARTBEAT_INTERVAL);
while (true)
{
var poller = new Poller(new List<ZmqSocket> { worker });
poller.Poll(TimeSpan.FromMilliseconds(HEARTBEAT_INTERVAL * 1000));
//If liveness hits zero, queue is considered disconnected
if (--liveness <= 0)
{
Console.WriteLine("W: heartbeat failure, can't reach queue.");
Console.WriteLine("W: reconnecting in {0} msecs...", interval);
try
{
Thread.Sleep(interval);
}
catch (System.Exception ex)
{
Console.WriteLine(ex.Message);
}
//Exponential Backoff
if (interval < INTERVAL_MAX)
interval *= 2;
liveness = HEARTBEAT_LIVENESS;
//Break the while loop and start the connection over
break;
}
//Send heartbeat to queue if it's time
if (DateTime.Now > heartbeat_at)
{
heartbeat_at = DateTime.Now.AddMilliseconds(HEARTBEAT_INTERVAL);
ZMessage zmsg = new ZMessage(PPP_HEARTBEAT);
zmsg.Send(worker);
}
}
}
}
}
}
