public static TMessageResponse?PublishAndWaitForExclusiveResponse <TMessageRequest, TMessageResponse>(this INetworkBus bus, TMessageRequest message, int timeout = -1)
where TMessageRequest : notnull, IMessage, new()
where TMessageResponse : class, IMessage, new()
{
using var firstResponseCancellationTokenSource = new CancellationTokenSource(timeout);
var firstResponseLock = new TaskCompletionSource <ExclusiveResponseMessage <TMessageRequest> >(TaskCreationOptions.RunContinuationsAsynchronously);
using var _ = bus.Subscribe <ExclusiveResponseMessage <TMessageRequest> >(msg =>
{
firstResponseLock.SetResult(msg);
}, null);
bus.Publish(new ExclusiveRequestMessage <TMessageRequest>(), null);
var firstResponse = firstResponseLock.Task.WaitAsync(firstResponseCancellationTokenSource.Token).WaitAndUnwrapException();
if (firstResponse == null)
{
return(null);
}
using var responseCancellationTokenSource = new CancellationTokenSource(timeout);
var responseLock = new TaskCompletionSource <ExclusiveAcceptedResponseMessage <TMessageResponse> >(TaskCreationOptions.RunContinuationsAsynchronously);
using var __ = bus.Subscribe <ExclusiveAcceptedResponseMessage <TMessageResponse> >(msg =>
{
responseLock.SetResult(msg);
}, firstResponse.ReferenceId);
bus.Publish(new ExclusiveAcceptedRequestMessage <TMessageRequest>(message), firstResponse.ReferenceId);
var response = responseLock.Task.WaitAsync(responseCancellationTokenSource.Token).WaitAndUnwrapException();
return(response.Response);
}
public static IDisposable SubscribeAndReplyToExclusive <TMessageRequest, TMessageResponse>(this INetworkBus bus, Func <TMessageRequest, Task <bool> > canReply, Func <TMessageRequest, Task <TMessageResponse> > func, Guid requestReferenceId)
where TMessageRequest : notnull, IMessage, new()
where TMessageResponse : notnull, IMessage, new()
{
var disposable1 = bus.Subscribe <ExclusiveRequestMessage <TMessageRequest> >(async message =>
{
if (await canReply(message.Request))
{
bus.Publish(new ExclusiveResponseMessage <TMessageRequest>(requestReferenceId), null);
}
}, null);
var disposable2 = bus.SubscribeAndReply <ExclusiveAcceptedRequestMessage <TMessageRequest> >(async message =>
{
return(new ExclusiveAcceptedResponseMessage <TMessageResponse>(await func(message.Request)));
}, requestReferenceId);
return(new CompositeDisposable(disposable1, disposable2));
}
public void Publish <T>(string topic, T payload) where T : class
{
var data = new byte[0];
// example, later use protobuf for serialisation
if (typeof(T) == typeof(string))
{
data = Encoding.UTF8.GetBytes((string)(object)payload);
}
else if (typeof(T).IsProto())
{
// protobuf message
using (var stream = new MemoryStream())
{
Serializer.Serialize(stream, payload);
data = stream.ToArray();
}
}
_networkBus.Publish(topic, data);
}