public static async Task ConsumeAsync <T>(
this IReadableChannel <T> channel,
Func <T, Task> handleAsync,
CancellationToken cancellationToken = default,
Func <Task> onCompletedAsync = null,
Func <Exception, Task> onTerminatedAsync = null)
{
try
{
do
{
while (channel.TryRead(out var item))
{
await handleAsync(item).ConfigureAwait(false);
}
} while (await channel.WaitReadAvailableAsync(cancellationToken).ConfigureAwait(false));
if (onCompletedAsync != null)
{
await onCompletedAsync().ConfigureAwait(false);
}
}
catch (Exception ex)
{
if (onTerminatedAsync != null)
{
await onTerminatedAsync(ex).ConfigureAwait(false);
}
else
{
throw;
}
}
}
public async Task DuplexStreaming(IReadableChannel <GreetingRequest> requestStream, IWritableChannel <GreetingResponse> responseStream, MethodCallContext context)
{
Console.WriteLine("Received duplex streaming request from {{{0}}}", context);
var greeting = "Hello!";
await responseStream.WriteAsync(new GreetingResponse { Greeting = greeting }).ConfigureAwait(false);
Console.WriteLine("Sent: {0}", greeting);
while (await requestStream.WaitReadAvailableAsync().ConfigureAwait(false))
{
while (requestStream.TryRead(out var request))
{
Console.WriteLine("Received: {0}", request.Name);
greeting = $"Hello, {request.Name}!";
await responseStream
.WriteAsync(new GreetingResponse { Greeting = greeting })
.ConfigureAwait(false);
Console.WriteLine("Sent: {0}", greeting);
}
}
Console.WriteLine("Request stream completed");
greeting = "Good Bye!";
await responseStream
.WriteAsync(new GreetingResponse { Greeting = greeting })
.ConfigureAwait(false);
Console.WriteLine("Sent: {0}", greeting);
greeting = "See you again!";
await responseStream
.WriteAsync(new GreetingResponse { Greeting = greeting })
.ConfigureAwait(false);
Console.WriteLine("Sent: {0}", greeting);
Console.WriteLine("Completed");
}
public static async ValueTask <Maybe <T> > TryReadAsync <T>(this IReadableChannel <T> channel, CancellationToken cancellationToken = default)
{
do
{
if (channel.TryRead(out var item))
{
return(item);
}
} while (await channel.WaitReadAvailableAsync(cancellationToken).ConfigureAwait(false));
return(Maybe <T> .Nothing);
}
public async Task <GreetingResponse> ClientStreaming(IReadableChannel <GreetingRequest> requestStream, MethodCallContext context)
{
Console.WriteLine("Received client streaming request from {{{0}}}", context);
var names = new List <string>();
while (await requestStream.WaitReadAvailableAsync().ConfigureAwait(false))
{
while (requestStream.TryRead(out var request))
{
Console.WriteLine("Received: {0}", request.Name);
names.Add(request.Name);
}
}
Console.WriteLine("Request stream completed");
var greeting = $"Hello, {string.Join(", ", names)}!";
Console.WriteLine("Sending response: {0}", greeting);
return(new GreetingResponse {
Greeting = greeting
});
}
