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Diffstat (limited to 'src/csharp/Grpc.Core/Internal/AsyncCallServer.cs')
| -rw-r--r-- | src/csharp/Grpc.Core/Internal/AsyncCallServer.cs | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/src/csharp/Grpc.Core/Internal/AsyncCallServer.cs b/src/csharp/Grpc.Core/Internal/AsyncCallServer.cs new file mode 100644 index 0000000000..d3a2be553f --- /dev/null +++ b/src/csharp/Grpc.Core/Internal/AsyncCallServer.cs @@ -0,0 +1,125 @@ +#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.Diagnostics; +using System.Runtime.CompilerServices; +using System.Runtime.InteropServices; +using System.Threading; +using System.Threading.Tasks; +using Grpc.Core.Internal; +using Grpc.Core.Utils; + +namespace Grpc.Core.Internal +{ + /// <summary> + /// Handles server side native call lifecycle. + /// </summary> + internal class AsyncCallServer<TRequest, TResponse> : AsyncCallBase<TResponse, TRequest> + { + readonly CompletionCallbackDelegate finishedServersideHandler; + readonly TaskCompletionSource<object> finishedServersideTcs = new TaskCompletionSource<object>(); + + public AsyncCallServer(Func<TResponse, byte[]> serializer, Func<byte[], TRequest> deserializer) : base(serializer, deserializer) + { + this.finishedServersideHandler = CreateBatchCompletionCallback(HandleFinishedServerside); + } + + public void Initialize(CallSafeHandle call) + { + InitializeInternal(call); + } + + /// <summary> + /// Starts a server side call. Currently, all server side calls are implemented as duplex + /// streaming call and they are adapted to the appropriate streaming arity. + /// </summary> + public Task ServerSideCallAsync(IObserver<TRequest> readObserver) + { + lock (myLock) + { + Preconditions.CheckNotNull(call); + + started = true; + this.readObserver = readObserver; + + call.StartServerSide(finishedServersideHandler); + StartReceiveMessage(); + return finishedServersideTcs.Task; + } + } + + /// <summary> + /// Sends a streaming response. Only one pending send action is allowed at any given time. + /// completionDelegate is called when the operation finishes. + /// </summary> + public void StartSendMessage(TResponse msg, AsyncCompletionDelegate completionDelegate) + { + StartSendMessageInternal(msg, completionDelegate); + } + + /// <summary> + /// Sends call result status, also indicating server is done with streaming responses. + /// Only one pending send action is allowed at any given time. + /// completionDelegate is called when the operation finishes. + /// </summary> + public void StartSendStatusFromServer(Status status, AsyncCompletionDelegate completionDelegate) + { + lock (myLock) + { + Preconditions.CheckNotNull(completionDelegate, "Completion delegate cannot be null"); + CheckSendingAllowed(); + + call.StartSendStatusFromServer(status, halfclosedHandler); + halfcloseRequested = true; + sendCompletionDelegate = completionDelegate; + } + } + + /// <summary> + /// Handles the server side close completion. + /// </summary> + private void HandleFinishedServerside(bool wasError, BatchContextSafeHandleNotOwned ctx) + { + lock (myLock) + { + finished = true; + + ReleaseResourcesIfPossible(); + } + // TODO: handle error ... + + finishedServersideTcs.SetResult(null); + } + } +}
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