@Override
  public boolean putEntry(EntryEventImpl event, boolean ifNew, boolean ifOld,
      Object expectedOldValue, boolean requireOldValue, long lastModified,
      boolean overwriteDestroyed, boolean invokeCallbacks, boolean throwConcurrentModification) {
    return getTXRegionStub(event.getRegion()).putEntry(event, ifNew, ifOld, expectedOldValue,
        requireOldValue, lastModified, overwriteDestroyed);
  }
Get or create a TXRegionStub for the given region. For regions that are new to the tx, we
validate their eligibility.

@param region The region to involve in the tx.
@return existing or new stub for region
geode-core/src/main/java/org/apache/geode/internal/cache/TXStateStub.java