io.wizzie.normalizer.funcs.MapperFunction Maven / Gradle / Ivy

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package io.wizzie.normalizer.funcs;

import io.wizzie.metrics.MetricsManager;
import org.apache.kafka.streams.KeyValue;
import org.apache.kafka.streams.kstream.KeyValueMapper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.Map;

/**
 * This class is used implement mapper process where you can transform one message into other
 */
public abstract class MapperFunction implements Function>>,
        KeyValueMapper, KeyValue>> {
    private final Logger log = LoggerFactory.getLogger(getClass());

    /**
     * Initialize mapper function
     * @param properties Properties for mapper function
     * @param metricsManager MetricsManager object for mapper function
     */
    @Override
    public void init(Map properties, MetricsManager metricsManager) {
        prepare(properties, metricsManager);
        log.info("   with {}", toString());
    }

    /**
     * Apply mapper function to Key-Value Kafka message
     * @param key The key of Kafka message
     * @param value The value of Kafka message
     * @return A Key-Value object after apply mapper function
     */
    @Override
    public KeyValue> apply(String key, Map value) {
        return process(key, value);
    }
}