Initial checkin of gRPC to third_party/

third_party/grpc/src/csharp/Grpc.Core/Internal/ChannelSafeHandle.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.Runtime.InteropServices;
+using System.Threading;
+using System.Threading.Tasks;
+using Grpc.Core.Profiling;
+
+namespace Grpc.Core.Internal
+{
+    /// <summary>
+    /// grpc_channel from <c>grpc/grpc.h</c>
+    /// </summary>
+    internal class ChannelSafeHandle : SafeHandleZeroIsInvalid
+    {
+        static readonly NativeMethods Native = NativeMethods.Get();
+
+        private ChannelSafeHandle()
+        {
+        }
+
+        public static ChannelSafeHandle CreateInsecure(string target, ChannelArgsSafeHandle channelArgs)
+        {
+            // Increment reference count for the native gRPC environment to make sure we don't do grpc_shutdown() before destroying the server handle.
+            // Doing so would make object finalizer crash if we end up abandoning the handle.
+            GrpcEnvironment.GrpcNativeInit();
+            return Native.grpcsharp_insecure_channel_create(target, channelArgs);
+        }
+
+        public static ChannelSafeHandle CreateSecure(ChannelCredentialsSafeHandle credentials, string target, ChannelArgsSafeHandle channelArgs)
+        {
+            // Increment reference count for the native gRPC environment to make sure we don't do grpc_shutdown() before destroying the server handle.
+            // Doing so would make object finalizer crash if we end up abandoning the handle.
+            GrpcEnvironment.GrpcNativeInit();
+            return Native.grpcsharp_secure_channel_create(credentials, target, channelArgs);
+        }
+
+        public CallSafeHandle CreateCall(CompletionRegistry registry, CallSafeHandle parentCall, ContextPropagationFlags propagationMask, CompletionQueueSafeHandle cq, string method, string host, Timespec deadline, CallCredentialsSafeHandle credentials)
+        {
+            using (Profilers.ForCurrentThread().NewScope("ChannelSafeHandle.CreateCall"))
+            {
+                var result = Native.grpcsharp_channel_create_call(this, parentCall, propagationMask, cq, method, host, deadline);
+                if (credentials != null)
+                {
+                    result.SetCredentials(credentials);
+                }
+                result.Initialize(registry, cq);
+                return result;
+            }
+        }
+
+        public ChannelState CheckConnectivityState(bool tryToConnect)
+        {
+            return Native.grpcsharp_channel_check_connectivity_state(this, tryToConnect ? 1 : 0);
+        }
+
+        public void WatchConnectivityState(ChannelState lastObservedState, Timespec deadline, CompletionQueueSafeHandle cq,
+            CompletionRegistry completionRegistry, BatchCompletionDelegate callback)
+        {
+            var ctx = BatchContextSafeHandle.Create();
+            completionRegistry.RegisterBatchCompletion(ctx, callback);
+            Native.grpcsharp_channel_watch_connectivity_state(this, lastObservedState, deadline, cq, ctx);
+        }
+
+        public string GetTarget()
+        {
+            using (var cstring = Native.grpcsharp_channel_get_target(this))
+            {
+                return cstring.GetValue();
+            }
+        }
+
+        protected override bool ReleaseHandle()
+        {
+            Native.grpcsharp_channel_destroy(handle);
+            GrpcEnvironment.GrpcNativeShutdown();
+            return true;
+        }
+    }
+}