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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.Collections.Generic;
using System.Threading;
using System.Threading.Tasks;
namespace Grpc.Core.Internal
{
internal class ServerRequestStream<TRequest, TResponse> : IAsyncStreamReader<TRequest>
where TRequest : class
where TResponse : class
{
readonly AsyncCallServer<TRequest, TResponse> call;
TRequest current;
public ServerRequestStream(AsyncCallServer<TRequest, TResponse> call)
{
this.call = call;
}
public TRequest 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;
return result != null;
}
public void Dispose()
{
// TODO(jtattermusch): implement the semantics of stream disposal.
}
}
}
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