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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.Runtime.InteropServices;
using Grpc.Core.Internal;
namespace Grpc.Core
{
/// <summary>
/// Encapsulates initialization and shutdown of gRPC library.
/// </summary>
public class GrpcEnvironment
{
const int THREAD_POOL_SIZE = 4;
[DllImport("grpc_csharp_ext.dll")]
static extern void grpcsharp_init();
[DllImport("grpc_csharp_ext.dll")]
static extern void grpcsharp_shutdown();
static object staticLock = new object();
static volatile GrpcEnvironment instance;
readonly GrpcThreadPool threadPool;
bool isClosed;
/// <summary>
/// Makes sure GRPC environment is initialized. Subsequent invocations don't have any
/// effect unless you call Shutdown first.
/// Although normal use cases assume you will call this just once in your application's
/// lifetime (and call Shutdown once you're done), for the sake of easier testing it's
/// allowed to initialize the environment again after it has been successfully shutdown.
/// </summary>
public static void Initialize()
{
lock (staticLock)
{
if (instance == null)
{
instance = new GrpcEnvironment();
}
}
}
/// <summary>
/// Shuts down the GRPC environment if it was initialized before.
/// Repeated invocations have no effect.
/// </summary>
public static void Shutdown()
{
lock (staticLock)
{
if (instance != null)
{
instance.Close();
instance = null;
}
}
}
internal static GrpcThreadPool ThreadPool
{
get
{
var inst = instance;
if (inst == null)
{
throw new InvalidOperationException("GRPC environment not initialized");
}
return inst.threadPool;
}
}
/// <summary>
/// Creates gRPC environment.
/// </summary>
private GrpcEnvironment()
{
GrpcLog.RedirectNativeLogs(Console.Error);
grpcsharp_init();
threadPool = new GrpcThreadPool(THREAD_POOL_SIZE);
threadPool.Start();
// TODO: use proper logging here
Console.WriteLine("GRPC initialized.");
}
/// <summary>
/// Shuts down this environment.
/// </summary>
private void Close()
{
if (isClosed)
{
throw new InvalidOperationException("Close has already been called");
}
threadPool.Stop();
grpcsharp_shutdown();
isClosed = true;
// TODO: use proper logging here
Console.WriteLine("GRPC shutdown.");
}
}
}
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