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/**
 * RecordContext interface
 */
public interface RecordContext {
    . . .          
    /**
     * Return the non-deserialized byte[] of the input message key if the context has been triggered by a message.
     *
     * <p> If this method is invoked within a {@link Punctuator#punctuate(long)
     * punctuation callback}, or while processing a record that was forwarded by a punctuation
     * callback, it will return null.
     *
     * <p> If this method is invoked in a sub-topology due to a repartition, the returned key would be one sent
     * to the repartition topic.
     *
     * <p> Always returns null if this method is invoked within a
     * ProductionExceptionHandler.handle(ErrorHandlerContext, ProducerRecord, Exception)
     *
     * @return the raw byte of the key of the source message
     */
    byte[] sourceRawKey();


    /**
     * Return the non-deserialized byte[] of the input message value if the context has been triggered by a message.
     *
     * <p> If this method is invoked within a {@link Punctuator#punctuate(long)
     * punctuation callback}, or while processing a record that was forwarded by a punctuation
     * callback, it will return null.
     *
     * <p> If this method is invoked in a sub-topology due to a repartition, the returned key would be one sent
     * to the repartition topic.
     *
     * <p> Always returns null if this method is invoked within a
     * ProductionExceptionHandler.handle(ErrorHandlerContext, ProducerRecord, Exception)
     *
     * @return the raw byte of the value of the source message
     */
    byte[] sourceRawValue();
       . . .
}