test.java

  public Scope receiveRequest(Map<Object, Object> context, Object request, String operation, Iterable<Map.Entry<String, String>> headers, Iterable<Map.Entry<String, String>> tags) {
    SpanContext sc = tracer.extract(Format.Builtin.HTTP_HEADERS, new TextMap() {
      @Override
      public Iterator<Map.Entry<String, String>> iterator() {
        return headers.iterator();
      }
      @Override
      public void put(String key, String value) {
        throw new UnsupportedOperationException();
      }
    });
    Tracer.SpanBuilder builder = tracer.buildSpan(operation);
    if (sc != null) {
      builder = builder.asChildOf(sc);
    }
    builder
      .ignoreActiveSpan()
      .withTag(Tags.SPAN_KIND.getKey(), Tags.SPAN_KIND_SERVER)
      .withTag(Tags.COMPONENT.getKey(), "vertx");
    Scope scope = builder.startActive(false);
    reportTags(scope.span(), tags);
    scope.close();
    context.put(ACTIVE_SCOPE, scope);
    return scope;
  }