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#region Copyright notice and license
// Copyright 2015 gRPC authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#endregion
using System.Threading.Tasks;
using Grpc.Core.Internal;
namespace Grpc.Core
{
/// <summary>
/// Helper methods for generated clients to make RPC calls.
/// Most users will use this class only indirectly and will be
/// making calls using client object generated from protocol
/// buffer definition files.
/// </summary>
public static class Calls
{
/// <summary>
/// Invokes a simple remote call in a blocking fashion.
/// </summary>
/// <returns>The response.</returns>
/// <param name="call">The call defintion.</param>
/// <param name="req">Request message.</param>
/// <typeparam name="TRequest">Type of request message.</typeparam>
/// <typeparam name="TResponse">The of response message.</typeparam>
public static TResponse BlockingUnaryCall<TRequest, TResponse>(CallInvocationDetails<TRequest, TResponse> call, TRequest req)
where TRequest : class
where TResponse : class
{
var asyncCall = new AsyncCall<TRequest, TResponse>(call);
return asyncCall.UnaryCall(req);
}
/// <summary>
/// Invokes a simple remote call asynchronously.
/// </summary>
/// <returns>An awaitable call object providing access to the response.</returns>
/// <param name="call">The call defintion.</param>
/// <param name="req">Request message.</param>
/// <typeparam name="TRequest">Type of request message.</typeparam>
/// <typeparam name="TResponse">The of response message.</typeparam>
public static AsyncUnaryCall<TResponse> AsyncUnaryCall<TRequest, TResponse>(CallInvocationDetails<TRequest, TResponse> call, TRequest req)
where TRequest : class
where TResponse : class
{
var asyncCall = new AsyncCall<TRequest, TResponse>(call);
var asyncResult = asyncCall.UnaryCallAsync(req);
return new AsyncUnaryCall<TResponse>(asyncResult, asyncCall.ResponseHeadersAsync, asyncCall.GetStatus, asyncCall.GetTrailers, asyncCall.Cancel);
}
/// <summary>
/// Invokes a server streaming call asynchronously.
/// In server streaming scenario, client sends on request and server responds with a stream of responses.
/// </summary>
/// <returns>A call object providing access to the asynchronous response stream.</returns>
/// <param name="call">The call defintion.</param>
/// <param name="req">Request message.</param>
/// <typeparam name="TRequest">Type of request message.</typeparam>
/// <typeparam name="TResponse">The of response messages.</typeparam>
public static AsyncServerStreamingCall<TResponse> AsyncServerStreamingCall<TRequest, TResponse>(CallInvocationDetails<TRequest, TResponse> call, TRequest req)
where TRequest : class
where TResponse : class
{
var asyncCall = new AsyncCall<TRequest, TResponse>(call);
asyncCall.StartServerStreamingCall(req);
var responseStream = new ClientResponseStream<TRequest, TResponse>(asyncCall);
return new AsyncServerStreamingCall<TResponse>(responseStream, asyncCall.ResponseHeadersAsync, asyncCall.GetStatus, asyncCall.GetTrailers, asyncCall.Cancel);
}
/// <summary>
/// Invokes a client streaming call asynchronously.
/// In client streaming scenario, client sends a stream of requests and server responds with a single response.
/// </summary>
/// <param name="call">The call defintion.</param>
/// <returns>An awaitable call object providing access to the response.</returns>
/// <typeparam name="TRequest">Type of request messages.</typeparam>
/// <typeparam name="TResponse">The of response message.</typeparam>
public static AsyncClientStreamingCall<TRequest, TResponse> AsyncClientStreamingCall<TRequest, TResponse>(CallInvocationDetails<TRequest, TResponse> call)
where TRequest : class
where TResponse : class
{
var asyncCall = new AsyncCall<TRequest, TResponse>(call);
var resultTask = asyncCall.ClientStreamingCallAsync();
var requestStream = new ClientRequestStream<TRequest, TResponse>(asyncCall);
return new AsyncClientStreamingCall<TRequest, TResponse>(requestStream, resultTask, asyncCall.ResponseHeadersAsync, asyncCall.GetStatus, asyncCall.GetTrailers, asyncCall.Cancel);
}
/// <summary>
/// Invokes a duplex streaming call asynchronously.
/// In duplex streaming scenario, client sends a stream of requests and server responds with a stream of responses.
/// The response stream is completely independent and both side can be sending messages at the same time.
/// </summary>
/// <returns>A call object providing access to the asynchronous request and response streams.</returns>
/// <param name="call">The call definition.</param>
/// <typeparam name="TRequest">Type of request messages.</typeparam>
/// <typeparam name="TResponse">Type of reponse messages.</typeparam>
public static AsyncDuplexStreamingCall<TRequest, TResponse> AsyncDuplexStreamingCall<TRequest, TResponse>(CallInvocationDetails<TRequest, TResponse> call)
where TRequest : class
where TResponse : class
{
var asyncCall = new AsyncCall<TRequest, TResponse>(call);
asyncCall.StartDuplexStreamingCall();
var requestStream = new ClientRequestStream<TRequest, TResponse>(asyncCall);
var responseStream = new ClientResponseStream<TRequest, TResponse>(asyncCall);
return new AsyncDuplexStreamingCall<TRequest, TResponse>(requestStream, responseStream, asyncCall.ResponseHeadersAsync, asyncCall.GetStatus, asyncCall.GetTrailers, asyncCall.Cancel);
}
}
}
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