private void setLastAccessedTime(long lastAccessedTime) throws EntryNotFoundException {
    RegionEntry re = getCheckedRegionEntry();
    re.setLastAccessed(lastAccessedTime);
  }
Returns the tasks region entry if it "checks" out. The check is to see if the region entry
still exists.

@throws EntryNotFoundException if the task no longer has a region entry or if the region entry
        it has is removed.
geode-core/src/main/java/org/apache/geode/internal/cache/EntryExpiryTask.java