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.CompletableFuture;
  11
  12
  13 @Slf4j
  14 public class SimpleProducer
  15 {
  16   private final String id;
  17   private final String topic;
  18   private final Producer<String, String> producer;
  19
  20   private long produced = 0;
  21   private volatile boolean running = true;
  22   private volatile boolean done = false;
  23
  24   public SimpleProducer(String broker, String topic, String clientId)
  25   {
  26     Properties props = new Properties();
  27     props.put("bootstrap.servers", broker);
  28     props.put("client.id", clientId); // Nur zur Wiedererkennung
  29     props.put("transactional.id", clientId); // Aktiviert außerdem enable.idempotence=true
  30     props.put("key.serializer", StringSerializer.class.getName());
  31     props.put("value.serializer", StringSerializer.class.getName());
  32
  33     this.id = clientId;
  34     this.topic = topic;
  35     producer = new KafkaProducer<>(props);
  36   }
  37
  38   public void run()
  39   {
  40     long i = 0;
  41
  42     try
  43     {
  44       for (; running ; i++)
  45       {
  46         send(Long.toString(i%10), Long.toString(i));
  47         Thread.sleep(500);
  48       }
  49     }
  50     catch (InterruptedException e) {}
  51     finally
  52     {
  53       log.info("{}: Closing the KafkaProducer", id);
  54       producer.close();
  55       log.info("{}: Produced {} messages in total, exiting!", id, produced);
  56       done = true;
  57     }
  58   }
  59
  60   CompletableFuture<Long> send(String key, String value)
  61   {
  62     final CompletableFuture<Long> result = new CompletableFuture<>();
  63     final long time = System.currentTimeMillis();
  64
  65     final ProducerRecord<String, String> record = new ProducerRecord<>(
  66         topic,  // Topic
  67         key,    // Key
  68         value   // Value
  69     );
  70
  71     producer.send(record, (metadata, e) ->
  72     {
  73       long now = System.currentTimeMillis();
  74       if (e == null)
  75       {
  76         // HANDLE SUCCESS
  77         produced++;
  78         log.debug(
  79             "{} - Sent key={} message={} partition={}/{} timestamp={} latency={}ms",
  80             id,
  81             record.key(),
  82             record.value(),
  83             metadata.partition(),
  84             metadata.offset(),
  85             metadata.timestamp(),
  86             now - time
  87         );
  88         result.complete(metadata.offset());
  89       }
  90       else
  91       {
  92         // HANDLE ERROR
  93         log.error(
  94             "{} - ERROR key={} timestamp={} latency={}ms: {}",
  95             id,
  96             record.key(),
  97             metadata == null ? -1 : metadata.timestamp(),
  98             now - time,
  99             e.toString()
 100         );
 101         result.completeExceptionally(e);
 102       }
 103     });
 104
 105     long now = System.currentTimeMillis();
 106     log.trace(
 107         "{} - Queued #{} key={} latency={}ms",
 108         id,
 109         value,
 110         record.key(),
 111         now - time
 112     );
 113
 114     return result;
 115   }
 116
 117
 118   public static void main(String[] args) throws Exception
 119   {
 120     String broker = ":9092";
 121     String topic = "test";
 122     String clientId = "DEV";
 123
 124     switch (args.length)
 125     {
 126       case 3:
 127         clientId = args[2];
 128       case 2:
 129         topic = args[1];
 130       case 1:
 131         broker = args[0];
 132     }
 133
 134     SimpleProducer instance = new SimpleProducer(broker, topic, clientId);
 135
 136     Runtime.getRuntime().addShutdownHook(new Thread(() ->
 137     {
 138       instance.running = false;
 139       while (!instance.done)
 140       {
 141         log.info("Waiting for main-thread...");
 142         try
 143         {
 144           Thread.sleep(1000);
 145         }
 146         catch (InterruptedException e) {}
 147       }
 148       log.info("Shutdown completed.");
 149     }));
 150
 151     log.info(
 152         "Running SimpleProducer: broker={}, topic={}, client-id={}",
 153         broker,
 154         topic,
 155         clientId);
 156     instance.run();
 157   }
 158 }