package org.apache.kafka.streams.query; 

	/**
	* Specifies the upper inclusive bound for the key query. The key query returns the record
	* with the greatest timestamp <= asOfTimestamp
	* @param asOfTimestamp The upper inclusive bound for timestamp
	* @throws RuntimeException if the query already has a specified asOfTimestamp.
	*/
    public KeyQuery<K, V> asOf(Instant asOfTimestamp);

   /**
     * The timestamp of the query, if specified
     */
    public Optional<Instant> getAsOfTimestamp() {
        return asOfTimestamp;
    }