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using System;
using Google.GRPC.Core.Internal;
using System.Runtime.InteropServices;
namespace Google.GRPC.Core
{
/// <summary>
/// Encapsulates initialization and shutdown of GRPC C core library.
/// You should not need to initialize it manually, as static constructors
/// should load the library when needed.
/// </summary>
public static class GrpcEnvironment
{
const int THREAD_POOL_SIZE = 1;
[DllImport("libgrpc.so")]
static extern void grpc_init();
[DllImport("libgrpc.so")]
static extern void grpc_shutdown();
static object staticLock = new object();
static bool initCalled = false;
static bool shutdownCalled = false;
static GrpcThreadPool threadPool = new GrpcThreadPool(THREAD_POOL_SIZE);
/// <summary>
/// Makes sure GRPC environment is initialized.
/// </summary>
public static void EnsureInitialized() {
lock(staticLock)
{
if (!initCalled)
{
initCalled = true;
GrpcInit();
}
}
}
/// <summary>
/// Shuts down the GRPC environment if it was initialized before.
/// Repeated invocations have no effect.
/// </summary>
public static void Shutdown()
{
lock(staticLock)
{
if (initCalled && !shutdownCalled)
{
shutdownCalled = true;
GrpcShutdown();
}
}
}
/// <summary>
/// Initializes GRPC C Core library.
/// </summary>
private static void GrpcInit()
{
grpc_init();
threadPool.Start();
// TODO: use proper logging here
Console.WriteLine("GRPC initialized.");
}
/// <summary>
/// Shutdown GRPC C Core library.
/// </summary>
private static void GrpcShutdown()
{
threadPool.Stop();
grpc_shutdown();
// TODO: use proper logging here
Console.WriteLine("GRPC shutdown.");
}
internal static GrpcThreadPool ThreadPool
{
get
{
return threadPool;
}
}
}
}
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