How to use

RootSpanSamplingStrategy

in

com.nike.wingtips.sampling

/**
 * Delegates to {@link #rootSpanSamplingStrategy}'s {@link RootSpanSamplingStrategy#isNextRootSpanSampleable()} method to determine whether the next root span should be
 * sampled.
 * <br/>
 * NOTE: This method is not deterministic - you may get a different response every time you call it. Therefore you should not call this method multiple times for the same
 * root span. Call it once and store the result for a given root span.
 *
 * @return true when the next root span should be sampled, false otherwise.
 */
protected boolean isNextRootSpanSampleable() {
  return rootSpanSamplingStrategy.isNextRootSpanSampleable();
}

@Test
public void isNextRootSpanSampleable_should_use_strategy() {
  // given: known sampling strategy that is set on the Tracer
  RootSpanSamplingStrategy mockStrategy = mock(RootSpanSamplingStrategy.class);
  Tracer.getInstance().setRootSpanSamplingStrategy(mockStrategy);
  // when: isNextRootSpanSampleable() is called
  Tracer.getInstance().isNextRootSpanSampleable();
  // then: the strategy's isNextRootSpanSampleable() method should have been called
  verify(mockStrategy).isNextRootSpanSampleable();
}