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

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package io.numaproj.numaflow.batchmapper;

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

public abstract class BatchMapper {
    /**
     * method which will be used for processing messages. Please implement the interface to ensure that each message generates a corresponding BatchResponse object with a matching ID.
     *
     * @param datumStream current message to be processed
     *
     * @return BatchResponses which contains output from batch map
     */
    public abstract BatchResponses processMessage(DatumIterator datumStream);
}