create overloads to make W3CTraceParent util easier to use

Author: na-ji

dd-java-agent/instrumentation/jdbc/src/main/java/datadog/trace/instrumentation/jdbc/JDBCDecorator.java

@@ -284,9 +284,7 @@ public void setAction(AgentSpan span, Connection connection) {
       if (priority == null) {
         return;
       }
-      final String traceContext =
-          DD_INSTRUMENTATION_PREFIX
-              + W3CTraceParent.build(span.getTraceId(), span.getSpanId(), priority);
+      final String traceContext = DD_INSTRUMENTATION_PREFIX + W3CTraceParent.from(span);
 
       connection.setClientInfo("OCSID.ACTION", traceContext);
 
@@ -372,8 +370,7 @@ public void setApplicationName(AgentSpan span, Connection connection) {
       if (priority == null) {
         return;
       }
-      final String traceParent =
-          W3CTraceParent.build(span.getTraceId(), span.getSpanId(), priority);
+      final String traceParent = W3CTraceParent.from(span);
       final String traceContext = "_DD_" + traceParent;
 
       connection.setClientInfo("ApplicationName", traceContext);

dd-java-agent/instrumentation/jdbc/src/main/java/datadog/trace/instrumentation/jdbc/StatementInstrumentation.java

@@ -120,7 +120,7 @@ public static AgentScope onEnter(
             Integer priority = span.forceSamplingDecision();
             if (priority != null) {
               if (!isSqlServer) {
-                traceParent = W3CTraceParent.build(span.getTraceId(), span.getSpanId(), priority);
+                traceParent = W3CTraceParent.from(span);
               }
               // set the dbm trace injected tag on the span
               span.setTag(DBM_TRACE_INJECTED, true);

dd-java-agent/instrumentation/mongo/common/src/main/java/datadog/trace/instrumentation/mongo/MongoCommentInjector.java

@@ -75,8 +75,7 @@ public static String buildComment(AgentSpan dbSpan, String hostname, String dbNa
     String dbService = dbSpan.getServiceName();
     String traceParent =
         Config.get().getDbmPropagationMode().equals(DBM_PROPAGATION_MODE_FULL)
-            ? W3CTraceParent.build(
-                dbSpan.getTraceId(), dbSpan.getSpanId(), dbSpan.context().getSamplingPriority())
+            ? W3CTraceParent.from(dbSpan)
             : null;
 
     // Use shared comment builder directly

dd-trace-core/src/main/java/datadog/trace/core/propagation/W3CHttpCodec.java

@@ -70,9 +70,7 @@ public <C> void inject(
     }
 
     private <C> void injectTraceParent(DDSpanContext context, C carrier, CarrierSetter<C> setter) {
-      String traceparent =
-          W3CTraceParent.build(
-              context.getTraceId(), context.getSpanId(), context.getSamplingPriority());
+      String traceparent = W3CTraceParent.from(context);
       setter.set(carrier, TRACE_PARENT_KEY, traceparent);
     }
 

dd-trace-core/src/main/java/datadog/trace/core/propagation/W3CTraceParent.java

@@ -2,6 +2,8 @@
 
 import datadog.trace.api.DDSpanId;
 import datadog.trace.api.DDTraceId;
+import datadog.trace.bootstrap.instrumentation.api.AgentSpan;
+import datadog.trace.core.DDSpanContext;
 
 /**
  * Utility class for building W3C traceparent headers.
@@ -22,11 +24,20 @@ private W3CTraceParent() {}
    * @param samplingPriority the sampling priority (positive values result in sampled flag set)
    * @return the W3C traceparent header value
    */
-  public static String build(DDTraceId traceId, long spanId, int samplingPriority) {
+  public static String from(DDTraceId traceId, long spanId, int samplingPriority) {
     return "00-"
         + traceId.toHexString()
         + '-'
         + DDSpanId.toHexStringPadded(spanId)
         + (samplingPriority > 0 ? "-01" : "-00");
   }
+
+  public static String from(AgentSpan span) {
+    return from(span.getTraceId(), span.getSpanId(), span.context().getSamplingPriority());
+  }
+
+  public static String from(DDSpanContext spanContext) {
+    return from(
+        spanContext.getTraceId(), spanContext.getSpanId(), spanContext.getSamplingPriority());
+  }
 }