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Batch Processor (Kafka KStreams sample)
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import org.apache.kafka.streams.processor.AbstractProcessor; | |
import org.apache.kafka.streams.processor.ProcessorContext; | |
import org.slf4j.Logger; | |
import org.slf4j.LoggerFactory; | |
import java.util.ArrayList; | |
public class BP2 extends AbstractProcessor<String, String> { | |
private static final Logger LOGGER = LoggerFactory.getLogger(BP2.class); | |
private ProcessorContext context; | |
private final long delay; | |
private final ArrayList<String> values; | |
public BP2(long delay) { | |
LOGGER.debug("BatchProcessor() constructor"); | |
this.delay = delay; | |
values = new ArrayList<>(); | |
} | |
@Override | |
public void process(String s, String s2) { | |
LOGGER.debug("batched processor s:{} s2:{}", s, s2); | |
values.add(s2); | |
} | |
@Override | |
public void init(ProcessorContext context) { | |
LOGGER.info("init"); | |
super.init(context); | |
values.clear(); | |
this.context = context; | |
context.schedule(delay); | |
} | |
@Override | |
public void punctuate(long timestamp) { | |
super.punctuate(timestamp); | |
LOGGER.info("punctuate ts: {} count: {}", timestamp, values.size()); | |
context().commit(); | |
} | |
} |
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