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#region Copyright notice and license
// Copyright 2015, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#endregion
using System;
using System.Threading;
using System.Threading.Tasks;
using Grpc.Core.Internal;
namespace Grpc.Core
{
/// <summary>
/// Helper methods for generated client stubs to make RPC calls.
/// </summary>
public static class Calls
{
public static TResponse BlockingUnaryCall<TRequest, TResponse>(Call<TRequest, TResponse> call, TRequest req, CancellationToken token)
where TRequest : class
where TResponse : class
{
var asyncCall = new AsyncCall<TRequest, TResponse>(call.RequestMarshaller.Serializer, call.ResponseMarshaller.Deserializer);
// TODO(jtattermusch): this gives a race that cancellation can be requested before the call even starts.
RegisterCancellationCallback(asyncCall, token);
return asyncCall.UnaryCall(call.Channel, call.Name, req, call.Headers);
}
public static async Task<TResponse> AsyncUnaryCall<TRequest, TResponse>(Call<TRequest, TResponse> call, TRequest req, CancellationToken token)
where TRequest : class
where TResponse : class
{
var asyncCall = new AsyncCall<TRequest, TResponse>(call.RequestMarshaller.Serializer, call.ResponseMarshaller.Deserializer);
asyncCall.Initialize(call.Channel, GetCompletionQueue(), call.Name);
var asyncResult = asyncCall.UnaryCallAsync(req, call.Headers);
RegisterCancellationCallback(asyncCall, token);
return await asyncResult;
}
public static AsyncServerStreamingCall<TResponse> AsyncServerStreamingCall<TRequest, TResponse>(Call<TRequest, TResponse> call, TRequest req, CancellationToken token)
where TRequest : class
where TResponse : class
{
var asyncCall = new AsyncCall<TRequest, TResponse>(call.RequestMarshaller.Serializer, call.ResponseMarshaller.Deserializer);
asyncCall.Initialize(call.Channel, GetCompletionQueue(), call.Name);
asyncCall.StartServerStreamingCall(req, call.Headers);
RegisterCancellationCallback(asyncCall, token);
var responseStream = new ClientResponseStream<TRequest, TResponse>(asyncCall);
return new AsyncServerStreamingCall<TResponse>(responseStream);
}
public static AsyncClientStreamingCall<TRequest, TResponse> AsyncClientStreamingCall<TRequest, TResponse>(Call<TRequest, TResponse> call, CancellationToken token)
where TRequest : class
where TResponse : class
{
var asyncCall = new AsyncCall<TRequest, TResponse>(call.RequestMarshaller.Serializer, call.ResponseMarshaller.Deserializer);
asyncCall.Initialize(call.Channel, GetCompletionQueue(), call.Name);
var resultTask = asyncCall.ClientStreamingCallAsync(call.Headers);
RegisterCancellationCallback(asyncCall, token);
var requestStream = new ClientRequestStream<TRequest, TResponse>(asyncCall);
return new AsyncClientStreamingCall<TRequest, TResponse>(requestStream, resultTask);
}
public static AsyncDuplexStreamingCall<TRequest, TResponse> AsyncDuplexStreamingCall<TRequest, TResponse>(Call<TRequest, TResponse> call, CancellationToken token)
where TRequest : class
where TResponse : class
{
var asyncCall = new AsyncCall<TRequest, TResponse>(call.RequestMarshaller.Serializer, call.ResponseMarshaller.Deserializer);
asyncCall.Initialize(call.Channel, GetCompletionQueue(), call.Name);
asyncCall.StartDuplexStreamingCall(call.Headers);
RegisterCancellationCallback(asyncCall, token);
var requestStream = new ClientRequestStream<TRequest, TResponse>(asyncCall);
var responseStream = new ClientResponseStream<TRequest, TResponse>(asyncCall);
return new AsyncDuplexStreamingCall<TRequest, TResponse>(requestStream, responseStream);
}
private static void RegisterCancellationCallback<TRequest, TResponse>(AsyncCall<TRequest, TResponse> asyncCall, CancellationToken token)
{
if (token.CanBeCanceled)
{
token.Register(() => asyncCall.Cancel());
}
}
/// <summary>
/// Gets shared completion queue used for async calls.
/// </summary>
private static CompletionQueueSafeHandle GetCompletionQueue()
{
return GrpcEnvironment.ThreadPool.CompletionQueue;
}
}
}
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