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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 NUnit.Framework;
using System.Threading;
using System.Threading.Tasks;
namespace Grpc.Core.Tests
{
public class ThreadingModelTest
{
const string Host = "127.0.0.1";
MockServiceHelper helper;
Server server;
Channel channel;
[SetUp]
public void Init()
{
helper = new MockServiceHelper(Host);
server = helper.GetServer();
server.Start();
channel = helper.GetChannel();
}
[TearDown]
public void Cleanup()
{
channel.ShutdownAsync().Wait();
server.ShutdownAsync().Wait();
}
[Test]
public void BlockingCallInServerHandlerDoesNotDeadlock()
{
helper.UnaryHandler = new UnaryServerMethod<string, string>((request, context) =>
{
int recursionDepth = int.Parse(request);
if (recursionDepth <= 0) {
return Task.FromResult("SUCCESS");
}
var response = Calls.BlockingUnaryCall(helper.CreateUnaryCall(), (recursionDepth - 1).ToString());
return Task.FromResult(response);
});
int maxRecursionDepth = Environment.ProcessorCount * 2; // make sure we have more pending blocking calls than threads in GrpcThreadPool
Assert.AreEqual("SUCCESS", Calls.BlockingUnaryCall(helper.CreateUnaryCall(), maxRecursionDepth.ToString()));
}
[Test]
public void HandlerDoesNotRunOnGrpcThread()
{
helper.UnaryHandler = new UnaryServerMethod<string, string>((request, context) =>
{
if (IsRunningOnGrpcThreadPool()) {
return Task.FromResult("Server handler should not run on gRPC threadpool thread.");
}
return Task.FromResult(request);
});
Assert.AreEqual("ABC", Calls.BlockingUnaryCall(helper.CreateUnaryCall(), "ABC"));
}
[Test]
public async Task ContinuationDoesNotRunOnGrpcThread()
{
helper.UnaryHandler = new UnaryServerMethod<string, string>((request, context) =>
{
return Task.FromResult(request);
});
await Calls.AsyncUnaryCall(helper.CreateUnaryCall(), "ABC");
Assert.IsFalse(IsRunningOnGrpcThreadPool());
}
private static bool IsRunningOnGrpcThreadPool()
{
var threadName = Thread.CurrentThread.Name ?? "";
return threadName.Contains("grpc");
}
}
}
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