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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;
using System.Threading.Tasks;
namespace Grpc.Core
{
/// <summary>
/// Return type for bidirectional streaming calls.
/// </summary>
/// <typeparam name="TRequest">Request message type for this call.</typeparam>
/// <typeparam name="TResponse">Response message type for this call.</typeparam>
public sealed class AsyncDuplexStreamingCall<TRequest, TResponse> : IDisposable
{
readonly IClientStreamWriter<TRequest> requestStream;
readonly IAsyncStreamReader<TResponse> responseStream;
readonly Task<Metadata> responseHeadersAsync;
readonly Func<Status> getStatusFunc;
readonly Func<Metadata> getTrailersFunc;
readonly Action disposeAction;
/// <summary>
/// Creates a new AsyncDuplexStreamingCall object with the specified properties.
/// </summary>
/// <param name="requestStream">Stream of request values.</param>
/// <param name="responseStream">Stream of response values.</param>
/// <param name="responseHeadersAsync">Response headers of the asynchronous call.</param>
/// <param name="getStatusFunc">Delegate returning the status of the call.</param>
/// <param name="getTrailersFunc">Delegate returning the trailing metadata of the call.</param>
/// <param name="disposeAction">Delegate to invoke when Dispose is called on the call object.</param>
public AsyncDuplexStreamingCall(IClientStreamWriter<TRequest> requestStream,
IAsyncStreamReader<TResponse> responseStream,
Task<Metadata> responseHeadersAsync,
Func<Status> getStatusFunc,
Func<Metadata> getTrailersFunc,
Action disposeAction)
{
this.requestStream = requestStream;
this.responseStream = responseStream;
this.responseHeadersAsync = responseHeadersAsync;
this.getStatusFunc = getStatusFunc;
this.getTrailersFunc = getTrailersFunc;
this.disposeAction = disposeAction;
}
/// <summary>
/// Async stream to read streaming responses.
/// </summary>
public IAsyncStreamReader<TResponse> ResponseStream
{
get
{
return responseStream;
}
}
/// <summary>
/// Async stream to send streaming requests.
/// </summary>
public IClientStreamWriter<TRequest> RequestStream
{
get
{
return requestStream;
}
}
/// <summary>
/// Asynchronous access to response headers.
/// </summary>
public Task<Metadata> ResponseHeadersAsync
{
get
{
return this.responseHeadersAsync;
}
}
/// <summary>
/// Gets the call status if the call has already finished.
/// Throws InvalidOperationException otherwise.
/// </summary>
public Status GetStatus()
{
return getStatusFunc();
}
/// <summary>
/// Gets the call trailing metadata if the call has already finished.
/// Throws InvalidOperationException otherwise.
/// </summary>
public Metadata GetTrailers()
{
return getTrailersFunc();
}
/// <summary>
/// Provides means to cleanup after the call.
/// If the call has already finished normally (request stream has been completed and response stream has been fully read), doesn't do anything.
/// Otherwise, requests cancellation of the call which should terminate all pending async operations associated with the call.
/// As a result, all resources being used by the call should be released eventually.
/// </summary>
/// <remarks>
/// Normally, there is no need for you to dispose the call unless you want to utilize the
/// "Cancel" semantics of invoking <c>Dispose</c>.
/// </remarks>
public void Dispose()
{
disposeAction.Invoke();
}
}
}
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