reta commented on issue #367: [CXF-7608] Propagate trace ids as it lets log 
correlation to be consi?
URL: https://github.com/apache/cxf/pull/367#issuecomment-358162063
 
 
   @aldex32 absolutely, here is the test case I have in mind:
   ```
       @Test
       public void testThatNoSpansAreRecordedWnenNotSampled() {
           final Tracing never = Tracing
               .newBuilder()
               .reporter(new TestSpanReporter())
               .sampler(Sampler.NEVER_SAMPLE)
               .build();
   
           final Response r = createWebClient("/bookstore/books", new 
BraveClientProvider(never)).get();
           assertEquals(Status.OK.getStatusCode(), r.getStatus());
   
           assertThat(TestSpanReporter.getAllSpans().size(), equalTo(0));
           assertThatTraceHeadersArePresent(r, false);
       }
   ```
   If we run it against the current master, it will fail and still record some 
spans. However, with your fix the trace / spans are correctly applying the 
sampler rules (in this case - never sampler) and nothing is being recorded. 
Please let me know if it makes sense to you. Thanks!

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