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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.Collections.Generic;
using System.Threading;
using System.Threading.Tasks;
namespace Grpc.Core.Internal
{
internal class ClientResponseStream<TRequest, TResponse> : IAsyncStreamReader<TResponse>
where TRequest : class
where TResponse : class
{
readonly AsyncCall<TRequest, TResponse> call;
TResponse current;
public ClientResponseStream(AsyncCall<TRequest, TResponse> call)
{
this.call = call;
}
public TResponse Current
{
get
{
if (current == null)
{
throw new InvalidOperationException("No current element is available.");
}
return current;
}
}
public async Task<bool> MoveNext(CancellationToken token)
{
if (token != CancellationToken.None)
{
throw new InvalidOperationException("Cancellation of individual reads is not supported.");
}
var result = await call.ReadMessageAsync().ConfigureAwait(false);
this.current = result;
if (result == null)
{
await call.StreamingCallFinishedTask.ConfigureAwait(false);
return false;
}
return true;
}
public void Dispose()
{
// TODO(jtattermusch): implement the semantics of stream disposal.
}
}
}
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