| #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."); |
| } |
| } |
| } |
| |