Initial checkin of gRPC to third_party/

third_party/grpc/src/csharp/Grpc.Core/Profiling/Profilers.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.IO;
+using System.Threading;
+using Grpc.Core.Internal;
+
+namespace Grpc.Core.Profiling
+{
+    internal static class Profilers
+    {
+        static readonly NopProfiler DefaultProfiler = new NopProfiler();
+        static readonly ThreadLocal<IProfiler> profilers = new ThreadLocal<IProfiler>();
+
+        public static IProfiler ForCurrentThread()
+        {
+            return profilers.Value ?? DefaultProfiler;
+        }
+
+        public static void SetForCurrentThread(IProfiler profiler)
+        {
+            profilers.Value = profiler;
+        }
+
+        public static ProfilerScope NewScope(this IProfiler profiler, string tag)
+        {
+            return new ProfilerScope(profiler, tag);
+        }
+    }
+
+    internal class NopProfiler : IProfiler
+    {
+        public void Begin(string tag)
+        {
+        }
+
+        public void End(string tag)
+        {
+        }
+
+        public void Mark(string tag)
+        {
+        }
+    }
+
+    // Profiler using Timespec.PreciseNow
+    internal class BasicProfiler : IProfiler
+    {
+        ProfilerEntry[] entries;
+        int count;
+
+        public BasicProfiler() : this(1024*1024)
+        {
+        }
+
+        public BasicProfiler(int capacity)
+        {
+            this.entries = new ProfilerEntry[capacity];
+        }
+
+        public void Begin(string tag)
+        {
+            AddEntry(new ProfilerEntry(Timespec.PreciseNow, ProfilerEntry.Type.BEGIN, tag));
+        }
+
+        public void End(string tag)
+        {
+            AddEntry(new ProfilerEntry(Timespec.PreciseNow, ProfilerEntry.Type.END, tag));
+        }
+
+        public void Mark(string tag)
+        {
+            AddEntry(new ProfilerEntry(Timespec.PreciseNow, ProfilerEntry.Type.MARK, tag));
+        }
+
+        public void Reset()
+        {
+            count = 0;
+        }
+
+        public void Dump(string filepath)
+        {
+            using (var stream = File.CreateText(filepath))
+            {
+                Dump(stream);
+            }
+        }
+
+        public void Dump(TextWriter stream)
+        {
+            for (int i = 0; i < count; i++)
+            {
+                var entry = entries[i];
+                stream.WriteLine(entry.ToString());
+            }
+        }
+
+        // NOT THREADSAFE!
+        void AddEntry(ProfilerEntry entry) {
+            entries[count++] = entry;
+        }
+    }
+}