How to use

extract

method

in

rocks.inspectit.agent.java.sdk.opentracing.propagation.Propagator

@Test
public void happyPath() {
  when(propagator.extract(carrier)).thenReturn(context);
  tracer.registerPropagator(Format.Builtin.TEXT_MAP, propagator);
  SpanContext extracted = tracer.extract(Format.Builtin.TEXT_MAP, carrier);
  assertThat(extracted, is((SpanContext) context));
  verify(propagator).extract(carrier);
  verifyNoMoreInteractions(propagator);
}

/**
 * {@inheritDoc}
 */
@SuppressWarnings("unchecked")
@Override
public <C> SpanContext extract(Format<C> format, C carrier) {
  if ((format == null) || (carrier == null)) {
    if (LOGGER.isDebugEnabled()) {
      LOGGER.debug("Context can not be extracted, both format and carrier must be provided.");
    }
    return null;
  }
  Propagator<C> propagator = (Propagator<C>) propagators.get(format);
  if (null != propagator) {
    SpanContextImpl context = propagator.extract(carrier);
    if (LOGGER.isDebugEnabled()) {
      LOGGER.debug("Context extracted: " + context);
    }
    return context;
  } else {
    if (LOGGER.isDebugEnabled()) {
      LOGGER.debug("Context can not be extracted, propagator does not exists for the format " + format.toString() + ".");
    }
    return null;
  }
}