juplo.de Git - demos/kafka/training/blob - src/main/java/de/juplo/kafka/SimpleProducer.java

   1 package de.juplo.kafka;
   2
   3 import lombok.extern.slf4j.Slf4j;
   4 import org.apache.kafka.clients.producer.KafkaProducer;
   5 import org.apache.kafka.clients.producer.ProducerRecord;
   6 import org.apache.kafka.common.serialization.StringSerializer;
   7
   8 import java.util.Properties;
   9 import java.util.concurrent.ExecutorService;
  10 import java.util.concurrent.Future;
  11
  12
  13 @Slf4j
  14 public class SimpleProducer
  15 {
  16   private final String id;
  17   private final String topic;
  18   private final KafkaProducer<String, String> producer;
  19
  20   private long produced = 0;
  21
  22   public SimpleProducer(String clientId, String topic)
  23   {
  24     // tag::create[]
  25     Properties props = new Properties();
  26     props.put("bootstrap.servers", "localhost:9092");
  27     props.put("key.serializer", StringSerializer.class.getName());
  28     props.put("value.serializer", StringSerializer.class.getName());
  29
  30     KafkaProducer<String, String> producer = new KafkaProducer<>(props);
  31     // end::create[]
  32
  33     this.id = clientId;
  34     this.topic = topic;
  35     this.producer = producer;
  36   }
  37
  38   public void run()
  39   {
  40     long i = 0;
  41
  42     try
  43     {
  44       for (; i < 100 ; i++)
  45       {
  46         send(Long.toString(i%10), Long.toString(i));
  47       }
  48
  49       log.info("{} - Done", id);
  50     }
  51     finally
  52     {
  53       log.info("{}: Closing the KafkaProducer", id);
  54       producer.close();
  55       log.info("{}: Produced {} messages in total, exiting!", id, produced);
  56     }
  57   }
  58
  59   void send(String key, String value)
  60   {
  61     final long time = System.currentTimeMillis();
  62
  63     final ProducerRecord<String, String> record = new ProducerRecord<>(
  64         "test", // Topic
  65         key,    // Key
  66         value   // Value
  67     );
  68
  69     producer.send(record, (metadata, e) ->
  70     {
  71       long now = System.currentTimeMillis();
  72       if (e == null)
  73       {
  74         // HANDLE SUCCESS
  75         produced++;
  76         log.debug(
  77             "{} - Sent key={} message={} partition={}/{} timestamp={} latency={}ms",
  78             id,
  79             record.key(),
  80             record.value(),
  81             metadata.partition(),
  82             metadata.offset(),
  83             metadata.timestamp(),
  84             now - time
  85         );
  86       }
  87       else
  88       {
  89         // HANDLE ERROR
  90         log.error(
  91             "{} - ERROR key={} timestamp={} latency={}ms: {}",
  92             id,
  93             record.key(),
  94             metadata == null ? -1 : metadata.timestamp(),
  95             now - time,
  96             e.toString()
  97         );
  98       }
  99     });
 100
 101     long now = System.currentTimeMillis();
 102     log.trace(
 103         "{} - Queued #{} key={} latency={}ms",
 104         id,
 105         value,
 106         record.key(),
 107         now - time
 108     );
 109   }
 110
 111
 112   public static void main(String[] args) throws Exception
 113   {
 114     SimpleProducer producer = new SimpleProducer("P", "test");
 115     producer.run();
 116   }
 117 }