public void setConcurrentMapOldValue(Object v) {
    if (Token.isRemoved(v)) {
      return;
    } else {
      if (Token.isInvalid(v)) {
        v = null;
      }
      retainAndSetOldValue(v);
    }
  }
sets the old value for concurrent map operation results received from a server.
geode-core/src/main/java/org/apache/geode/internal/cache/EntryEventImpl.java