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#region Copyright notice and license
// Copyright 2015-2016, 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 System.Threading.Tasks;
using Grpc.Core.Internal;
using Grpc.Core.Logging;
using Grpc.Core.Utils;
namespace Grpc.Core
{
/// <summary>
/// Encapsulates initialization and shutdown of gRPC library.
/// </summary>
public class GrpcEnvironment
{
const int THREAD_POOL_SIZE = 4;
static object staticLock = new object();
static GrpcEnvironment instance;
static int refCount;
static ILogger logger = new ConsoleLogger();
readonly GrpcThreadPool threadPool;
readonly CompletionRegistry completionRegistry;
readonly DebugStats debugStats = new DebugStats();
bool isClosed;
/// <summary>
/// Returns a reference-counted instance of initialized gRPC environment.
/// Subsequent invocations return the same instance unless reference count has dropped to zero previously.
/// </summary>
internal static GrpcEnvironment AddRef()
{
lock (staticLock)
{
refCount++;
if (instance == null)
{
instance = new GrpcEnvironment();
}
return instance;
}
}
/// <summary>
/// Decrements the reference count for currently active environment and shuts down the gRPC environment if reference count drops to zero.
/// (and blocks until the environment has been fully shutdown).
/// </summary>
internal static void Release()
{
lock (staticLock)
{
Preconditions.CheckState(refCount > 0);
refCount--;
if (refCount == 0)
{
instance.Close();
instance = null;
}
}
}
internal static int GetRefCount()
{
lock (staticLock)
{
return refCount;
}
}
/// <summary>
/// Gets application-wide logger used by gRPC.
/// </summary>
/// <value>The logger.</value>
public static ILogger Logger
{
get
{
return logger;
}
}
/// <summary>
/// Sets the application-wide logger that should be used by gRPC.
/// </summary>
public static void SetLogger(ILogger customLogger)
{
Preconditions.CheckNotNull(customLogger, "customLogger");
logger = customLogger;
}
/// <summary>
/// Creates gRPC environment.
/// </summary>
private GrpcEnvironment()
{
GrpcNativeInit();
completionRegistry = new CompletionRegistry(this);
threadPool = new GrpcThreadPool(this, THREAD_POOL_SIZE);
threadPool.Start();
}
/// <summary>
/// Gets the completion registry used by this gRPC environment.
/// </summary>
internal CompletionRegistry CompletionRegistry
{
get
{
return this.completionRegistry;
}
}
/// <summary>
/// Gets the completion queue used by this gRPC environment.
/// </summary>
internal CompletionQueueSafeHandle CompletionQueue
{
get
{
return this.threadPool.CompletionQueue;
}
}
/// <summary>
/// Gets the completion queue used by this gRPC environment.
/// </summary>
internal DebugStats DebugStats
{
get
{
return this.debugStats;
}
}
/// <summary>
/// Gets version of gRPC C core.
/// </summary>
internal static string GetCoreVersionString()
{
var ptr = NativeMethods.Get().grpcsharp_version_string(); // the pointer is not owned
return Marshal.PtrToStringAnsi(ptr);
}
internal static void GrpcNativeInit()
{
NativeMethods.Get().grpcsharp_init();
}
internal static void GrpcNativeShutdown()
{
NativeMethods.Get().grpcsharp_shutdown();
}
/// <summary>
/// Shuts down this environment.
/// </summary>
private void Close()
{
if (isClosed)
{
throw new InvalidOperationException("Close has already been called");
}
threadPool.Stop();
GrpcNativeShutdown();
isClosed = true;
debugStats.CheckOK();
}
}
}
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