@Override
  public void preStoreScannerOpen(ObserverContext<? extends RegionCoprocessorEnvironment> ctx,
    Store store, ScanOptions options) throws IOException {
    if (options.getScan().getTimeRange().isAllTime()) {
      setScanOptions(options);
    }
  }
A sample region observer that tests the RegionObserver interface. It works with
TestRegionObserverInterface to provide the test case.
hbase-server/src/test/java/org/apache/hadoop/hbase/coprocessor/SimpleRegionObserver.java