Initial checkin of gRPC to third_party/

third_party/grpc/src/csharp/Grpc.Core/Internal/CompletionRegistry.cs

+#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.Collections.Concurrent;
+using System.Collections.Generic;
+using System.Runtime.InteropServices;
+using Grpc.Core.Logging;
+using Grpc.Core.Utils;
+
+namespace Grpc.Core.Internal
+{
+    internal delegate void OpCompletionDelegate(bool success);
+
+    internal delegate void BatchCompletionDelegate(bool success, BatchContextSafeHandle ctx);
+
+    internal class CompletionRegistry
+    {
+        static readonly ILogger Logger = GrpcEnvironment.Logger.ForType<CompletionRegistry>();
+
+        readonly GrpcEnvironment environment;
+        readonly ConcurrentDictionary<IntPtr, OpCompletionDelegate> dict = new ConcurrentDictionary<IntPtr, OpCompletionDelegate>();
+
+        public CompletionRegistry(GrpcEnvironment environment)
+        {
+            this.environment = environment;
+        }
+
+        public void Register(IntPtr key, OpCompletionDelegate callback)
+        {
+            environment.DebugStats.PendingBatchCompletions.Increment();
+            GrpcPreconditions.CheckState(dict.TryAdd(key, callback));
+        }
+
+        public void RegisterBatchCompletion(BatchContextSafeHandle ctx, BatchCompletionDelegate callback)
+        {
+            OpCompletionDelegate opCallback = ((success) => HandleBatchCompletion(success, ctx, callback));
+            Register(ctx.Handle, opCallback);
+        }
+
+        public OpCompletionDelegate Extract(IntPtr key)
+        {
+            OpCompletionDelegate value;
+            GrpcPreconditions.CheckState(dict.TryRemove(key, out value));
+            environment.DebugStats.PendingBatchCompletions.Decrement();
+            return value;
+        }
+
+        private static void HandleBatchCompletion(bool success, BatchContextSafeHandle ctx, BatchCompletionDelegate callback)
+        {
+            try
+            {
+                callback(success, ctx);
+            }
+            catch (Exception e)
+            {
+                Logger.Error(e, "Exception occured while invoking completion delegate.");
+            }
+            finally
+            {
+                if (ctx != null)
+                {
+                    ctx.Dispose();
+                }
+            }
+        }
+    }
+}