monitory-data-source/src/main/java/com/monitory/data/utils/KafkaUtil.java at develop · Fac2Real/monitory-data-source · GitHub

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package com.monitory.data.utils;

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.monitory.data.config.KafkaConfig;
import org.apache.flink.api.common.serialization.SimpleStringSchema;
import org.apache.flink.connector.kafka.sink.KafkaRecordSerializationSchema;
import org.apache.flink.connector.kafka.sink.KafkaSink;

public class KafkaUtil {
    private static final ObjectMapper mapper = new ObjectMapper();

    public static KafkaSink<String> createKafkaSink() {
        return KafkaSink.<String>builder()
            .setBootstrapServers(KafkaConfig.get("KAFKA_SERVER"))
            .setRecordSerializer(
                    KafkaRecordSerializationSchema.<String>builder()
                        .setValueSerializationSchema(new SimpleStringSchema())
                            .setTopicSelector((element) -> {
                                try {
                                    JsonNode json = mapper.readTree(element);
                                    String category = json.path("category").asText(null);

                                    if (category != null && !category.isEmpty()) {
                                        return category;
                                    } else {
                                        return "sensor.unknown_category_topic";
                                    }

                                } catch (Exception e) {
                                    return "sensor.error_topic";
                                }
                            })
                        .build()
            )
            .build();
    }
}