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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.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>
/// Manages 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)
{
DebugStats.ActiveServerCalls.Increment();
InitializeInternal(call);
}
/// <summary>
/// Starts a server side call.
/// </summary>
public Task ServerSideCallAsync()
{
lock (myLock)
{
Preconditions.CheckNotNull(call);
started = true;
call.StartServerSide(finishedServersideHandler);
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<object> completionDelegate)
{
StartSendMessageInternal(msg, completionDelegate);
}
/// <summary>
/// Receives a streaming request. Only one pending read action is allowed at any given time.
/// completionDelegate is called when the operation finishes.
/// </summary>
public void StartReadMessage(AsyncCompletionDelegate<TRequest> completionDelegate)
{
StartReadMessageInternal(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<object> completionDelegate)
{
lock (myLock)
{
Preconditions.CheckNotNull(completionDelegate, "Completion delegate cannot be null");
CheckSendingAllowed();
call.StartSendStatusFromServer(status, halfclosedHandler);
halfcloseRequested = true;
sendCompletionDelegate = completionDelegate;
}
}
protected override void OnReleaseResources()
{
DebugStats.ActiveServerCalls.Decrement();
}
/// <summary>
/// Handles the server side close completion.
/// </summary>
private void HandleFinishedServerside(bool wasError, BatchContextSafeHandleNotOwned ctx)
{
bool cancelled = ctx.GetReceivedCloseOnServerCancelled();
lock (myLock)
{
finished = true;
if (cancelled)
{
// Once we cancel, we don't have to care that much
// about reads and writes.
Cancel();
}
ReleaseResourcesIfPossible();
}
// TODO(jtattermusch): check if call was cancelled.
// TODO: handle error ...
finishedServersideTcs.SetResult(null);
}
}
}
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