@Override
  public void toData(DataOutput out) throws IOException {
    out.writeInt(timeout);
    DataSerializer.writeObject(action, out);
  }
Returns a string representation of this <code>ExpirationAttributes</code>. If the timeout is
zero, returns <code>"NO EXPIRATION"</code>.

@return the String representation of this expiration attribute
geode-core/src/main/java/org/apache/geode/cache/ExpirationAttributes.java