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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 System.Collections.Concurrent;
using System.Collections.Generic;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Threading;
using Grpc.Core.Logging;
using Grpc.Core.Utils;
namespace Grpc.Core.Internal
{
internal delegate void BatchCompletionDelegate(bool success, BatchContextSafeHandle ctx, object state);
internal delegate void RequestCallCompletionDelegate(bool success, RequestCallContextSafeHandle ctx);
internal class CompletionRegistry
{
static readonly ILogger Logger = GrpcEnvironment.Logger.ForType<CompletionRegistry>();
readonly GrpcEnvironment environment;
readonly Dictionary<IntPtr, IOpCompletionCallback> dict = new Dictionary<IntPtr, IOpCompletionCallback>(new IntPtrComparer());
SpinLock spinLock = new SpinLock(Debugger.IsAttached);
IntPtr lastRegisteredKey; // only for testing
public CompletionRegistry(GrpcEnvironment environment)
{
this.environment = environment;
}
public void Register(IntPtr key, IOpCompletionCallback callback)
{
environment.DebugStats.PendingBatchCompletions.Increment();
bool lockTaken = false;
try
{
spinLock.Enter(ref lockTaken);
dict.Add(key, callback);
this.lastRegisteredKey = key;
}
finally
{
if (lockTaken) spinLock.Exit();
}
}
public void RegisterBatchCompletion(BatchContextSafeHandle ctx, BatchCompletionDelegate callback, object state)
{
ctx.SetCompletionCallback(callback, state);
Register(ctx.Handle, ctx);
}
public void RegisterRequestCallCompletion(RequestCallContextSafeHandle ctx, RequestCallCompletionDelegate callback)
{
ctx.CompletionCallback = callback;
Register(ctx.Handle, ctx);
}
public IOpCompletionCallback Extract(IntPtr key)
{
IOpCompletionCallback value = null;
bool lockTaken = false;
try
{
spinLock.Enter(ref lockTaken);
value = dict[key];
dict.Remove(key);
}
finally
{
if (lockTaken) spinLock.Exit();
}
environment.DebugStats.PendingBatchCompletions.Decrement();
return value;
}
/// <summary>
/// For testing purposes only. NOT threadsafe.
/// </summary>
public IntPtr LastRegisteredKey
{
get { return this.lastRegisteredKey; }
}
/// <summary>
/// IntPtr doesn't implement <c>IEquatable{IntPtr}</c> so we need to use custom comparer to avoid boxing.
/// </summary>
private class IntPtrComparer : IEqualityComparer<IntPtr>
{
public bool Equals(IntPtr x, IntPtr y)
{
return x == y;
}
public int GetHashCode(IntPtr obj)
{
return obj.GetHashCode();
}
}
}
}
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