address comments

src/csharp/Grpc.IntegrationTesting.StressClient/Program.cs

@@ -1,4 +1,37 @@
-using System;
+#region Copyright notice and license
+
+// Copyright 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;
 
 namespace Grpc.IntegrationTesting.StressClient
 {

src/csharp/Grpc.IntegrationTesting/StressTestClient.cs

@@ -269,6 +269,8 @@ namespace Grpc.IntegrationTesting
 
         class MetricsServiceImpl : MetricsService.MetricsServiceBase 
         {
+            const string GaugeName = "csharp_overall_qps";
+
             readonly Histogram histogram;
             readonly WallClockStopwatch wallClockStopwatch = new WallClockStopwatch();
 
@@ -277,20 +279,40 @@ namespace Grpc.IntegrationTesting
                 this.histogram = histogram;
             }
 
-            public override async Task GetAllGauges(EmptyMessage request, IServerStreamWriter<GaugeResponse> responseStream, ServerCallContext context)
+            public override Task<GaugeResponse> GetGauge(GaugeRequest request, ServerCallContext context)
             {
-                var snapshot = histogram.GetSnapshot(true);
+                if (request.Name == GaugeName)
-                var elapsedSnapshot = wallClockStopwatch.GetElapsedSnapshot(true);
+                {
+                    long qps = GetQpsAndReset();
 
-                double qps = snapshot.Count / elapsedSnapshot.Seconds;
+                    return Task.FromResult(new GaugeResponse
+                    {
+                        Name = GaugeName,
+                        LongValue = qps
+                    });
+                }
+                throw new RpcException(new Status(StatusCode.InvalidArgument, "Gauge does not exist"));
+            }
+
+            public override async Task GetAllGauges(EmptyMessage request, IServerStreamWriter<GaugeResponse> responseStream, ServerCallContext context)
+            {
+                long qps = GetQpsAndReset();
 
                 var response = new GaugeResponse
                 {
-                    Name = "csharp_overall_qps",
+                    Name = GaugeName,
-                    DoubleValue = qps
+                    LongValue = qps
                 };
                 await responseStream.WriteAsync(response);
             }
+
+            long GetQpsAndReset()
+            {
+                var snapshot = histogram.GetSnapshot(true);
+                var elapsedSnapshot = wallClockStopwatch.GetElapsedSnapshot(true);
+
+                return (long) (snapshot.Count / elapsedSnapshot.Seconds);
+            }
         }
     }
 }