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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.sourcetransformer;

import lombok.Builder;
import lombok.Getter;
import lombok.Singular;

import java.util.ArrayList;
import java.util.List;

/**
 * MessageList is used to return the list of Messages from SourceTransformer functions.
 */

@Getter
@Builder(builderMethodName = "newBuilder")
public class MessageList {

    @Singular("addMessage")
    private List messages;

    /**
     * Builder to build MessageList
     */
    public static class MessageListBuilder {
        /**
         * @param messages to append all the messages to MessageList
         *
         * @return returns the builder
         */
        public MessageListBuilder addAllMessages(Iterable messages) {
            if (this.messages == null) {
                this.messages = new ArrayList<>();
            }

            for (Message message : messages) {
                this.messages.add(message);
            }
            return this;
        }
    }
}