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.Producer;
   5 import org.apache.kafka.clients.producer.KafkaProducer;
   6 import org.apache.kafka.clients.producer.ProducerRecord;
   7 import org.apache.kafka.common.serialization.StringSerializer;
   8
   9 import java.util.Properties;
  10 import java.util.concurrent.ExecutorService;
  11 import java.util.concurrent.Future;
  12
  13
  14 @Slf4j
  15 public class SimpleProducer
  16 {
  17   private final String id;
  18   private final String topic;
  19   private final Producer<String, String> producer;
  20
  21   private long produced = 0;
  22
  23   public SimpleProducer(String clientId, String topic)
  24   {
  25     // tag::create[]
  26     Properties props = new Properties();
  27     props.put("bootstrap.servers", "localhost:9092");
  28     props.put("key.serializer", StringSerializer.class.getName());
  29     props.put("value.serializer", StringSerializer.class.getName());
  30
  31     Producer<String, String> producer = new KafkaProducer<>(props);
  32     // end::create[]
  33
  34     this.id = clientId;
  35     this.topic = topic;
  36     this.producer = producer;
  37   }
  38
  39   public void run()
  40   {
  41     long i = 0;
  42
  43     try
  44     {
  45       for (; i < 100 ; i++)
  46       {
  47         send(Long.toString(i%10), Long.toString(i));
  48       }
  49
  50       log.info("{} - Done", id);
  51     }
  52     finally
  53     {
  54       log.info("{}: Closing the KafkaProducer", id);
  55       producer.close();
  56       log.info("{}: Produced {} messages in total, exiting!", id, produced);
  57     }
  58   }
  59
  60   void send(String key, String value)
  61   {
  62     final long time = System.currentTimeMillis();
  63
  64     final ProducerRecord<String, String> record = new ProducerRecord<>(
  65         topic,  // Topic
  66         key,    // Key
  67         value   // Value
  68     );
  69
  70     producer.send(record, (metadata, e) ->
  71     {
  72       long now = System.currentTimeMillis();
  73       if (e == null)
  74       {
  75         // HANDLE SUCCESS
  76         produced++;
  77         log.debug(
  78             "{} - Sent key={} message={} partition={}/{} timestamp={} latency={}ms",
  79             id,
  80             record.key(),
  81             record.value(),
  82             metadata.partition(),
  83             metadata.offset(),
  84             metadata.timestamp(),
  85             now - time
  86         );
  87       }
  88       else
  89       {
  90         // HANDLE ERROR
  91         log.error(
  92             "{} - ERROR key={} timestamp={} latency={}ms: {}",
  93             id,
  94             record.key(),
  95             metadata == null ? -1 : metadata.timestamp(),
  96             now - time,
  97             e.toString()
  98         );
  99       }
 100     });
 101
 102     long now = System.currentTimeMillis();
 103     log.trace(
 104         "{} - Queued #{} key={} latency={}ms",
 105         id,
 106         value,
 107         record.key(),
 108         now - time
 109     );
 110   }
 111
 112
 113   public static void main(String[] args) throws Exception
 114   {
 115     SimpleProducer producer = new SimpleProducer("P", "test");
 116     producer.run();
 117   }
 118 }