@Override
  public void removeShadowPR(String prRegionName) {
    ((ParallelGatewaySenderQueue) queue).removeShadowPR(prRegionName);
  }
use in concurrent scenario where queue is to be shared among all the processors.
geode-core/src/main/java/org/apache/geode/internal/cache/wan/parallel/ParallelGatewaySenderEventProcessor.java