| public PollTillCancelledNonBlocking ( ) : void | ||
| return | void | |
static void Main(string[] args)
{
using (var context = NetMQContext.Create())
using (var udpSocket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp))
using (var poller = new Poller())
{
// Ask OS to let us do broadcasts from socket
udpSocket.SetSocketOption(SocketOptionLevel.Udp, SocketOptionName.Broadcast, 1);
// Bind UDP socket to local port so we can receive pings
udpSocket.Bind(new IPEndPoint(IPAddress.Any, PingPortNumber));
// We use zmq_poll to wait for activity on the UDP socket, because
// this function works on non-0MQ file handles. We send a beacon
// once a second, and we collect and report beacons that come in
// from other nodes:
poller.AddPollInSocket(udpSocket, socket => { });
poller.PollTillCancelledNonBlocking();
//poller.ad
//var poller = new z
//var pollItemsList = new List<ZPollItem>();
//pollItemsList.Add(new ZPollItem(ZPoll.In));
//var pollItem = ZPollItem.CreateReceiver();
//ZMessage message;
//ZError error;
//pollItem.ReceiveMessage(udpSocket, out message, out error);
//pollItem.ReceiveMessage = (ZSocket socket, out ZMessage message, out ZError error) =>
// Send first ping right away
}
}
public NetMQScheduler(NetMQContext context, Poller poller = null)
{
m_context = context;
if (poller == null)
{
m_ownPoller = true;
m_poller = new Poller();
}
else
{
m_ownPoller = false;
m_poller = poller;
}
m_tasksQueue = new ConcurrentQueue <Task>();
m_syncObject = new object();
m_schedulerId = Interlocked.Increment(ref s_schedulerCounter);
m_address = string.Format("{0}://scheduler-{1}", NetMQ.zmq.Address.InProcProtocol, m_schedulerId);
m_serverSocket = context.CreatePullSocket();
m_serverSocket.Options.Linger = TimeSpan.Zero;
m_serverSocket.Bind(m_address);
m_currentMessageHandler = OnMessageFirstTime;
m_serverSocket.ReceiveReady += m_currentMessageHandler;
m_poller.AddSocket(m_serverSocket);
m_clientSocket = m_context.CreatePushSocket();
m_clientSocket.Connect(m_address);
m_schedulerThread = new ThreadLocal <bool>(() => false);
if (m_ownPoller)
{
m_poller.PollTillCancelledNonBlocking();
}
}
private NetMQScheduler(Poller poller, PushSocket pushSocket, PullSocket pullSocket)
{
if (poller == null)
{
m_ownPoller = true;
m_poller = new Poller();
}
else
{
m_ownPoller = false;
m_poller = poller;
}
var address = string.Format("{0}://scheduler-{1}",
Address.InProcProtocol,
Interlocked.Increment(ref s_schedulerCounter));
m_serverSocket = pullSocket;
m_serverSocket.Options.Linger = TimeSpan.Zero;
m_serverSocket.Bind(address);
m_currentMessageHandler = OnMessageFirstTime;
m_serverSocket.ReceiveReady += m_currentMessageHandler;
m_poller.AddSocket(m_serverSocket);
m_clientSocket = pushSocket;
m_clientSocket.Connect(address);
m_isSchedulerThread = new ThreadLocal <bool>(() => false);
if (m_ownPoller)
{
m_poller.PollTillCancelledNonBlocking();
}
}
public void Run()
{
Console.WriteLine("[CLIENT {0}] Starting", m_id);
var rnd = new Random(m_id);
// each request shall have an unique id in order to recognize an reply for a request
var messageId = new byte[5];
// create clientId for messages
var clientId = new[] { m_id };
// a flag to signal that an answer has arrived
bool messageAnswered = false;
// we use a poller because we have a socket and a timer to monitor
using (var clientPoller = new Poller())
using (var context = NetMQContext.Create())
using (var client = context.CreateRequestSocket())
using (var monitor = context.CreatePushSocket())
{
client.Connect(m_localFrontendAddress);
monitor.Connect(m_monitorAddress);
client.Options.Identity = new[] { m_id };
var timer = new NetMQTimer((int)TimeSpan.FromSeconds(10).TotalMilliseconds);
// use as flag to indicate exit
var exit = false;
// every 10 s check if message has been received, if not then send error message and ext
// and restart timer otherwise
timer.Elapsed += (s, e) =>
{
if (messageAnswered)
{
e.Timer.Enable = true;
}
else
{
var msg = string.Format("[CLIENT {0}] ERR - EXIT - lost message {1}", m_id, messageId);
// send an error message
monitor.Send(msg);
// if poller is started than stop it
if (clientPoller.IsStarted)
clientPoller.CancelAndJoin();
// mark the required exit
exit = true;
}
};
// process arriving answers
client.ReceiveReady += (s, e) =>
{
// mark the arrival of an answer
messageAnswered = true;
// worker is supposed to answer with our request id
var reply = e.Socket.ReceiveMultipartMessage();
if (reply.FrameCount == 0)
{
// something went wrong
monitor.Send(string.Format("[CLIENT {0}] Received an empty message!", m_id));
// mark the exit flag to ensure the exit
exit = true;
}
else
{
var sb = new StringBuilder();
// create success message
foreach (var frame in reply)
sb.Append("[" + frame.ConvertToString() + "]");
// send the success message
monitor.Send(string.Format("[CLIENT {0}] Received answer {1}",
m_id,
sb.ToString()));
}
};
// add socket & timer to poller
clientPoller.AddSocket(client);
clientPoller.AddTimer(timer);
// start poller in another thread to allow the continued processing
clientPoller.PollTillCancelledNonBlocking();
// if true the message has been answered
// the 0th message is always answered
messageAnswered = true;
while (!exit)
{
// simulate sporadic activity by randomly delaying
Thread.Sleep((int)TimeSpan.FromSeconds(rnd.Next(5)).TotalMilliseconds);
// only send next message if the previous one has been replied to
if (messageAnswered)
{
// generate random 5 byte as identity for for the message
rnd.NextBytes(messageId);
messageAnswered = false;
// create message [client adr][empty][message id] and send it
var msg = new NetMQMessage();
msg.Push(messageId);
msg.Push(NetMQFrame.Empty);
msg.Push(clientId);
client.SendMessage(msg);
}
}
// stop poller if needed
if (clientPoller.IsStarted)
clientPoller.CancelAndJoin();
}
}
/// <summary>
/// Start proxying messages between the front and back ends.
/// </summary>
/// <exception cref="InvalidOperationException">The proxy has already been started.</exception>
public void Start()
{
_status = "Attempting to start";
if (Interlocked.CompareExchange(ref _state, Running, NotStarted) != NotStarted)
{
throw new InvalidOperationException("ZeroMQ XPub-XSub hub has already been started");
}
_status = "Starting";
_subscriber.ReceiveReady += OnSubscriberReady;
_publisher.ReceiveReady += OnPublisherReady;
_poller = new Poller(_subscriber, _publisher);
if (_heartbeat != null)
{
_poller.AddTimer(_heartbeat);
}
this.SetJobState(JobState.Running);
_status = "Started";
_poller.PollTillCancelledNonBlocking();
_status = "Running Until Canceled";
}
/// <summary>
/// ParanoidPirate.Queue [-v]
///
/// Does load-balancing with heartbeating on worker tasks to detect
/// crashed, blocked or slow running worker tasks .
/// </summary>
private static void Main(string[] args)
{
Console.Title = "NetMQ ParanoidPirate Queue";
// serves as flag for exiting the program
var exit = false;
// catch CTRL+C as exit command
Console.CancelKeyPress += (s, e) =>
{
e.Cancel = true;
exit = true;
};
var verbose = args.Length > 0 && args[0] == "-v";
using (var context = NetMQContext.Create())
using (var frontend = context.CreateRouterSocket())
using (var backend = context.CreateRouterSocket())
using (var poller = new Poller())
{
frontend.Bind(Commons.QueueFrontend);
backend.Bind(Commons.QueueBackend);
var workers = new Workers();
// client sends to this socket
frontend.ReceiveReady += (s, e) =>
{
// only process incoming client requests
// if we have workers available handle client requests as long as we have workers
// storage capability of the socket otherwise and pick up later
if (workers.Available)
{
// get all message frames!
var request = frontend.ReceiveMultipartMessage();
if (verbose)
Console.WriteLine("[QUEUE] received {0}", request);
// get next available worker
var worker = workers.Next();
// wrap message with worker's address
var msg = Wrap(worker, request);
if (verbose)
Console.WriteLine("[QUEUE -> WORKER] sending {0}", msg);
backend.SendMessage(msg);
}
};
// worker sends to this socket
backend.ReceiveReady += (s, e) =>
{
var msg = e.Socket.ReceiveMultipartMessage();
if (verbose)
Console.WriteLine("[QUEUE <- WORKER] received {0}", msg);
// use workers identity for load-balancing
var workerIdentity = Unwrap(msg);
var worker = new Worker(workerIdentity);
workers.Ready(worker);
// just convenience
var readableWorkerId = workerIdentity.ConvertToString();
if (msg.FrameCount == 1)
{
var data = msg[0].ConvertToString();
// the message is either READY or HEARTBEAT or corrupted
switch (data)
{
case Commons.PPPHeartbeat:
Console.WriteLine("[QUEUE <- WORKER] Received a Heartbeat from {0}",
readableWorkerId);
break;
case Commons.PPPReady:
Console.WriteLine("[QUEUE <- WORKER] Received a READY form {0}",
readableWorkerId);
break;
default:
Console.WriteLine("[QUEUE <- WORKER] ERROR received an invalid message!");
break;
}
}
else
{
if (verbose)
Console.WriteLine("[QUEUE -> CLIENT] sending {0}", msg);
frontend.SendMessage(msg);
}
};
var timer = new NetMQTimer(Commons.HeartbeatInterval);
// every specified ms QUEUE shall send a heartbeat to all connected workers
timer.Elapsed += (s, e) =>
{
// send heartbeat to every worker
foreach (var worker in workers)
{
var heartbeat = new NetMQMessage();
heartbeat.Push(new NetMQFrame(Commons.PPPHeartbeat));
heartbeat.Push(worker.Identity);
Console.WriteLine("[QUEUE -> WORKER] sending heartbeat!");
backend.SendMessage(heartbeat);
}
// restart timer
e.Timer.Enable = true;
// remove all dead or expired workers
workers.Purge();
};
if (verbose)
Console.WriteLine("[QUEUE] Start listening!");
poller.AddSocket(frontend);
poller.AddSocket(backend);
poller.PollTillCancelledNonBlocking();
// hit CRTL+C to stop the while loop
while (!exit)
{}
// Cleanup
poller.RemoveTimer(timer);
// stop the poler task
poller.CancelAndJoin();
// remove the sockets - Dispose is called automatically
poller.RemoveSocket(frontend);
poller.RemoveSocket(backend);
}
}
private static IDisposable StartNetMQServer()
{
var host = new WampHost();
var serverContext = NetMQContext.Create();
var serverSocket = serverContext.CreateResponseSocket();// serverContext.CreateRouterSocket();
var serverPoller = new Poller(serverSocket);
var serverScheduler = new NetMQScheduler(serverContext, serverPoller);
serverPoller.PollTillCancelledNonBlocking();
host.RegisterTransport(new NetMQTransport(serverSocket, serverScheduler),
new JTokenJsonBinding(), new JTokenMsgpackBinding(), new ProtobufBinding());
host.Open();
var realm = host.RealmContainer.GetRealmByName("realm1");
realm.Services.RegisterCallee(new SumService(), new CalleeNameInterceptor()).Wait(); // add services (aka, RPC endpoints) like this
// realm.Services.RegisterPublisher // register some event triggerer here
return host;
}