toString calls through getDescription (#1813)

Author: XiXiaPdx

sdk/tracing/src/main/java/io/opentelemetry/sdk/trace/Samplers.java

@@ -181,6 +181,11 @@ public SamplingResult shouldSample(
     public String getDescription() {
       return "AlwaysOnSampler";
     }
+
+    @Override
+    public String toString() {
+      return getDescription();
+    }
   }
 
   @Immutable
@@ -203,6 +208,11 @@ public SamplingResult shouldSample(
     public String getDescription() {
       return "AlwaysOffSampler";
     }
+
+    @Override
+    public String toString() {
+      return getDescription();
+    }
   }
 
   @Immutable
@@ -269,6 +279,11 @@ public String getDescription() {
           this.localParentNotSampled.getDescription());
     }
 
+    @Override
+    public String toString() {
+      return getDescription();
+    }
+
     static class Builder {
       private final Sampler root;
       private Sampler remoteParentSampled;
@@ -375,22 +390,6 @@ public int hashCode() {
       result = 31 * result + (localParentNotSampled != null ? localParentNotSampled.hashCode() : 0);
       return result;
     }
-
-    @Override
-    public String toString() {
-      return "ParentBased{"
-          + "root="
-          + root
-          + ", remoteParentSampled="
-          + remoteParentSampled
-          + ", remoteParentNotSampled="
-          + remoteParentNotSampled
-          + ", localParentSampled="
-          + localParentSampled
-          + ", localParentNotSampled="
-          + localParentNotSampled
-          + '}';
-    }
   }
 
   /**
@@ -461,6 +460,11 @@ public final SamplingResult shouldSample(
     public final String getDescription() {
       return String.format("TraceIdRatioBased{%.6f}", getRatio());
     }
+
+    @Override
+    public final String toString() {
+      return getDescription();
+    }
   }
 
   @Immutable

sdk_extensions/jaeger_remote_sampler/src/main/java/io/opentelemetry/sdk/extensions/trace/jaeger/sampler/JaegerRemoteSampler.java

@@ -103,12 +103,12 @@ private static Sampler updateSampler(SamplingStrategyResponse response) {
 
   @Override
   public String getDescription() {
-    return this.toString();
+    return String.format("JaegerRemoteSampler{%s}", this.sampler);
   }
 
   @Override
   public String toString() {
-    return String.format("JaegerRemoteSampler{%s}", this.sampler);
+    return getDescription();
   }
 
   @VisibleForTesting

sdk_extensions/jaeger_remote_sampler/src/main/java/io/opentelemetry/sdk/extensions/trace/jaeger/sampler/PerOperationSampler.java

@@ -51,13 +51,13 @@ public SamplingResult shouldSample(
 
   @Override
   public String getDescription() {
-    return toString();
+    return String.format(
+        "PerOperationSampler{default=%s, perOperation=%s}",
+        this.defaultSampler, this.perOperationSampler);
   }
 
   @Override
   public String toString() {
-    return String.format(
-        "PerOperationSampler{default=%s, perOperation=%s}",
-        this.defaultSampler, this.perOperationSampler);
+    return getDescription();
   }
 }

sdk_extensions/jaeger_remote_sampler/src/main/java/io/opentelemetry/sdk/extensions/trace/jaeger/sampler/RateLimitingSampler.java

@@ -72,12 +72,12 @@ public SamplingResult shouldSample(
 
   @Override
   public String getDescription() {
-    return this.toString();
+    return String.format("RateLimitingSampler{%.2f}", maxTracesPerSecond);
   }
 
   @Override
   public String toString() {
-    return String.format("RateLimitingSampler{%.2f}", maxTracesPerSecond);
+    return getDescription();
   }
 
   @VisibleForTesting

sdk_extensions/jaeger_remote_sampler/src/test/java/io/opentelemetry/sdk/extensions/trace/jaeger/sampler/JaegerRemoteSamplerTest.java

@@ -113,7 +113,7 @@ void description() {
             .setServiceName(SERVICE_NAME)
             .build();
     assertThat(sampler.getDescription())
-        .matches("JaegerRemoteSampler\\{TraceIdRatioBased\\{ratio=0.001, idUpperBound=.*\\}\\}");
+        .isEqualTo("JaegerRemoteSampler{TraceIdRatioBased{0.001000}}");
 
     // wait until the sampling strategy is retrieved before exiting test method
     await().atMost(10, TimeUnit.SECONDS).until(samplerIsType(sampler, RateLimitingSampler.class));