Add since for Span.Kind constants and make SpanBuilder.setSpanKind not abstract. (#1226)

2 files changed, 8 insertions, 3 deletions

diff --git a/api/src/main/java/io/opencensus/trace/Span.java b/api/src/main/java/io/opencensus/trace/Span.java
index 4ec532e9..0fc62daf 100644
--- a/api/src/main/java/io/opencensus/trace/Span.java
+++ b/api/src/main/java/io/opencensus/trace/Span.java
@@ -268,13 +268,16 @@ public abstract class Span {
    */
   public enum Kind {
     /**
-     * Indicates that the span covers server-side handling of an RPC or other remote network
-     * request.
+     * Indicates that the span covers server-side handling of an RPC or other remote request.
+     *
+     * @since 0.14
      */
     SERVER,
 
     /**
      * Indicates that the span covers the client-side wrapper around an RPC or other remote request.
+     *
+     * @since 0.14
      */
     CLIENT
   }
diff --git a/api/src/main/java/io/opencensus/trace/SpanBuilder.java b/api/src/main/java/io/opencensus/trace/SpanBuilder.java
index e66adf57..00e11572 100644
--- a/api/src/main/java/io/opencensus/trace/SpanBuilder.java
+++ b/api/src/main/java/io/opencensus/trace/SpanBuilder.java
@@ -147,7 +147,9 @@ public abstract class SpanBuilder {
    * @return this.
    * @since 0.14
    */
-  public abstract SpanBuilder setSpanKind(Span.Kind spanKind);
+  public SpanBuilder setSpanKind(@Nullable Span.Kind spanKind) {
+    return this;
+  }
 
   /**
    * Starts a new {@link Span}.