Renaming ProbabilitySampler to TraceIdRatioBasedSampler

src/OpenTelemetry/CHANGELOG.md

@@ -36,6 +36,8 @@
   [#1135](https://github.com/open-telemetry/opentelemetry-dotnet/pull/1135))
 * Renamed `ParentOrElseSampler` to `ParentBasedSampler`
   ([#1173](https://github.com/open-telemetry/opentelemetry-dotnet/pull/1173))
+* Renamed `ProbabilitySampler` to `TraceIdRatioBasedSampler`
+  ([#1174](https://github.com/open-telemetry/opentelemetry-dotnet/pull/1174))
 
 ## 0.4.0-beta.2
 

src/OpenTelemetry/README.md

@@ -58,7 +58,7 @@ reducing the number of samples of traces collected and sent to the backend. If
 no sampler is explicitly specified, the default is to use
 [AlwaysOnSampler](https://github.com/open-telemetry/opentelemetry-specification/blob/master/specification/trace/sdk.md#alwayson).
 The following example shows how to change it to
-[ProbabilitySampler](https://github.com/open-telemetry/opentelemetry-specification/blob/master/specification/trace/sdk.md#probability)
+[TraceIdRatioBasedSampler](https://github.com/open-telemetry/opentelemetry-specification/blob/master/specification/trace/sdk.md#traceidratiobased)
 with sampling probability of 25%.
 
 ```csharp
@@ -67,7 +67,7 @@ using OpenTelemetry.Trace;
 
 using var otel = Sdk.CreateTracerProvider(b => b
     .AddActivitySource("MyCompany.MyProduct.MyLibrary")
-    .SetSampler(new ProbabilitySampler(0.25))
+    .SetSampler(new TraceIdRatioBasedSampler(0.25))
     .UseConsoleExporter());
 ```
 

src/OpenTelemetry/Trace/ProbabilitySampler.cs → src/OpenTelemetry/Trace/TraceIdRatioBasedSampler.cs

@@ -1,4 +1,4 @@
-// <copyright file="ProbabilitySampler.cs" company="OpenTelemetry Authors">
+// <copyright file="TraceIdRatioBasedSampler.cs" company="OpenTelemetry Authors">
 // Copyright The OpenTelemetry Authors
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
@@ -21,18 +21,19 @@ namespace OpenTelemetry.Trace
     /// <summary>
     /// Samples traces according to the specified probability.
     /// </summary>
-    public sealed class ProbabilitySampler : Sampler
+    public sealed class TraceIdRatioBasedSampler
+        : Sampler
     {
         private readonly long idUpperBound;
         private readonly double probability;
 
         /// <summary>
-        /// Initializes a new instance of the <see cref="ProbabilitySampler"/> class.
+        /// Initializes a new instance of the <see cref="TraceIdRatioBasedSampler"/> class.
         /// </summary>
         /// <param name="probability">The desired probability of sampling. This must be between 0.0 and 1.0.
         /// Higher the value, higher is the probability of a given Activity to be sampled in.
         /// </param>
-        public ProbabilitySampler(double probability)
+        public TraceIdRatioBasedSampler(double probability)
         {
             if (probability < 0.0 || probability > 1.0)
             {
@@ -41,8 +42,8 @@ public ProbabilitySampler(double probability)
 
             this.probability = probability;
 
-            // The expected description is like ProbabilitySampler{0.000100}
-            this.Description = "ProbabilitySampler{" + this.probability.ToString("F6", CultureInfo.InvariantCulture) + "}";
+            // The expected description is like TraceIdRatioBasedSampler{0.000100}
+            this.Description = "TraceIdRatioBasedSampler{" + this.probability.ToString("F6", CultureInfo.InvariantCulture) + "}";
 
             // Special case the limits, to avoid any possible issues with lack of precision across
             // double/long boundaries. For probability == 0.0, we use Long.MIN_VALUE as this guarantees

test/OpenTelemetry.Tests/Trace/ProbabilitySamplerTest.cs → test/OpenTelemetry.Tests/Trace/TraceIdRatioBasedSamplerTest.cs

@@ -1,4 +1,4 @@
-// <copyright file="ProbabilitySamplerTest.cs" company="OpenTelemetry Authors">
+// <copyright file="TraceIdRatioBasedSamplerTest.cs" company="OpenTelemetry Authors">
 // Copyright The OpenTelemetry Authors
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
@@ -19,29 +19,29 @@
 
 namespace OpenTelemetry.Trace.Tests
 {
-    public class ProbabilitySamplerTest
+    public class TraceIdRatioBasedSamplerTest
     {
         private const string ActivityDisplayName = "MyActivityName";
         private static readonly ActivityKind ActivityKindServer = ActivityKind.Server;
 
         [Fact]
-        public void ProbabilitySampler_OutOfRangeHighProbability()
+        public void OutOfRangeHighProbability()
         {
-            Assert.Throws<ArgumentOutOfRangeException>(() => new ProbabilitySampler(1.01));
+            Assert.Throws<ArgumentOutOfRangeException>(() => new TraceIdRatioBasedSampler(1.01));
         }
 
         [Fact]
-        public void ProbabilitySampler_OutOfRangeLowProbability()
+        public void OutOfRangeLowProbability()
         {
-            Assert.Throws<ArgumentOutOfRangeException>(() => new ProbabilitySampler(-0.00001));
+            Assert.Throws<ArgumentOutOfRangeException>(() => new TraceIdRatioBasedSampler(-0.00001));
         }
 
         [Fact]
-        public void ProbabilitySampler_SampleBasedOnTraceId()
+        public void SampleBasedOnTraceId()
         {
-            Sampler defaultProbability = new ProbabilitySampler(0.0001);
+            Sampler defaultProbability = new TraceIdRatioBasedSampler(0.0001);
 
-            // This traceId will not be sampled by the ProbabilitySampler because the first 8 bytes as long
+            // This traceId will not be sampled by the TraceIdRatioBasedSampler because the first 8 bytes as long
             // is not less than probability * Long.MAX_VALUE;
             var notSampledtraceId =
                 ActivityTraceId.CreateFromBytes(
@@ -68,7 +68,7 @@ public void ProbabilitySampler_SampleBasedOnTraceId()
                 SamplingDecision.NotRecord,
                 defaultProbability.ShouldSample(new SamplingParameters(default, notSampledtraceId, ActivityDisplayName, ActivityKindServer, null, null)).Decision);
 
-            // This traceId will be sampled by the ProbabilitySampler because the first 8 bytes as long
+            // This traceId will be sampled by the TraceIdRatioBasedSampler because the first 8 bytes as long
             // is less than probability * Long.MAX_VALUE;
             var sampledtraceId =
                 ActivityTraceId.CreateFromBytes(
@@ -97,10 +97,10 @@ public void ProbabilitySampler_SampleBasedOnTraceId()
         }
 
         [Fact]
-        public void ProbabilitySampler_GetDescription()
+        public void GetDescription()
         {
-            var expectedDescription = "ProbabilitySampler{0.500000}";
-            Assert.Equal(expectedDescription, new ProbabilitySampler(0.5).Description);
+            var expectedDescription = "TraceIdRatioBasedSampler{0.500000}";
+            Assert.Equal(expectedDescription, new TraceIdRatioBasedSampler(0.5).Description);
         }
     }
 }