@Override
  public void addShadowPartitionedRegionForUserPR(PartitionedRegion pr) {
    ((ParallelGatewaySenderQueue) queue).addShadowPartitionedRegionForUserPR(pr);
  }
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