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#region Copyright notice and license
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// Copyright 2015, Google Inc.
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// All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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using System.Diagnostics;
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using System.Runtime.CompilerServices;
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using System.Runtime.InteropServices;
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using System.Threading;
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using System.Threading.Tasks;
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using Grpc.Core.Internal;
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using Grpc.Core.Utils;
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namespace Grpc.Core.Internal
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/// Manages server side native call lifecycle.
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internal class AsyncCallServer<TRequest, TResponse> : AsyncCallBase<TResponse, TRequest>
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readonly TaskCompletionSource<object> finishedServersideTcs = new TaskCompletionSource<object>();
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public AsyncCallServer(Func<TResponse, byte[]> serializer, Func<byte[], TRequest> deserializer) : base(serializer, deserializer)
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public void Initialize(CallSafeHandle call)
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DebugStats.ActiveServerCalls.Increment();
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InitializeInternal(call);
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/// Starts a server side call.
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public Task ServerSideCallAsync()
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Preconditions.CheckNotNull(call);
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call.StartServerSide(HandleFinishedServerside);
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return finishedServersideTcs.Task;
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/// Sends a streaming response. Only one pending send action is allowed at any given time.
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/// completionDelegate is called when the operation finishes.
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public void StartSendMessage(TResponse msg, AsyncCompletionDelegate<object> completionDelegate)
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StartSendMessageInternal(msg, completionDelegate);
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/// Receives a streaming request. Only one pending read action is allowed at any given time.
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/// completionDelegate is called when the operation finishes.
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public void StartReadMessage(AsyncCompletionDelegate<TRequest> completionDelegate)
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StartReadMessageInternal(completionDelegate);
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/// Sends call result status, also indicating server is done with streaming responses.
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/// Only one pending send action is allowed at any given time.
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/// completionDelegate is called when the operation finishes.
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public void StartSendStatusFromServer(Status status, AsyncCompletionDelegate<object> completionDelegate)
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Preconditions.CheckNotNull(completionDelegate, "Completion delegate cannot be null");
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CheckSendingAllowed();
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call.StartSendStatusFromServer(status, HandleHalfclosed);
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halfcloseRequested = true;
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sendCompletionDelegate = completionDelegate;
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protected override void OnReleaseResources()
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DebugStats.ActiveServerCalls.Decrement();
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/// Handles the server side close completion.
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private void HandleFinishedServerside(bool success, BatchContextSafeHandle ctx)
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bool cancelled = ctx.GetReceivedCloseOnServerCancelled();
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// Once we cancel, we don't have to care that much
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// about reads and writes.
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ReleaseResourcesIfPossible();
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// TODO(jtattermusch): handle error
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finishedServersideTcs.SetResult(null);
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