Merge pull request #283 from DataDog/tyler/span-times

Add startTime and Duration methods to MutableSpan interface

dd-trace-api/src/main/java/datadog/trace/api/interceptor/MutableSpan.java

@@ -3,6 +3,13 @@ package datadog.trace.api.interceptor;
 import java.util.Map;
 
 public interface MutableSpan {
+
+  /** @return Start time with nanosecond scale, but millisecond resolution. */
+  long getStartTime();
+
+  /** @return Duration with nanosecond scale. */
+  long getDurationNano();
+
   String getOperationName();
 
   MutableSpan setOperationName(final String serviceName);

dd-trace-ot/src/main/java/datadog/opentracing/DDSpan.java

@@ -285,11 +285,13 @@ public class DDSpan implements Span, MutableSpan {
     return meta;
   }
 
+  @Override
   @JsonGetter("start")
   public long getStartTime() {
     return startTimeMicro * 1000L;
   }
 
+  @Override
   @JsonGetter("duration")
   public long getDurationNano() {
     return durationNano.get();