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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.reducestreamer.model;

/**
 * OutputStreamObserver sends to the output stream, the messages generate by the reduce streamer.
 */
public interface OutputStreamObserver {
    /**
     * method will be used for sending messages to the output stream.
     *
     * @param message the message to be sent
     */
    void send(Message message);
}