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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.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;
internal 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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