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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.Runtime.CompilerServices;
using System.Threading.Tasks;
namespace Grpc.Core
{
/// <summary>
/// Return type for single request - single response call.
/// </summary>
/// <typeparam name="TResponse">Response message type for this call.</typeparam>
public sealed class AsyncUnaryCall<TResponse> : IDisposable
{
readonly Task<TResponse> responseAsync;
readonly Task<Metadata> responseHeadersAsync;
readonly Func<Status> getStatusFunc;
readonly Func<Metadata> getTrailersFunc;
readonly Action disposeAction;
/// <summary>
/// Creates a new AsyncUnaryCall object with the specified properties.
/// </summary>
/// <param name="responseAsync">The response of the asynchronous call.</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 AsyncUnaryCall(Task<TResponse> responseAsync,
Task<Metadata> responseHeadersAsync,
Func<Status> getStatusFunc,
Func<Metadata> getTrailersFunc,
Action disposeAction)
{
this.responseAsync = responseAsync;
this.responseHeadersAsync = responseHeadersAsync;
this.getStatusFunc = getStatusFunc;
this.getTrailersFunc = getTrailersFunc;
this.disposeAction = disposeAction;
}
/// <summary>
/// Asynchronous call result.
/// </summary>
public Task<TResponse> ResponseAsync
{
get
{
return this.responseAsync;
}
}
/// <summary>
/// Asynchronous access to response headers.
/// </summary>
public Task<Metadata> ResponseHeadersAsync
{
get
{
return this.responseHeadersAsync;
}
}
/// <summary>
/// Allows awaiting this object directly.
/// </summary>
public TaskAwaiter<TResponse> GetAwaiter()
{
return responseAsync.GetAwaiter();
}
/// <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 call result has been received), 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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