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SDK to implement Numaflow Source or User Defined Functions or Sinks in Java.

There is a newer version: 0.9.0

package io.numaproj.numaflow.mapper;

/**
 * Mapper exposes method for performing map operation.
 * Implementations should override the processMessage method
 * which will be used for processing the input messages
 */

public abstract class Mapper {
    /**
     * method which will be used for processing messages.
     *
     * @param keys message keys
     * @param datum current message to be processed
     * @return MessageList which contains output from map
     */
    public abstract MessageList processMessage(String[] keys, Datum datum);
}