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     producer.initTransactions();
  37   }
  38
  39   public void run()
  40   {
  41     long i = 0;
  42
  43     try
  44     {
  45       for (; running ; i++)
  46       {
  47         send(Long.toString(i%10), Long.toString(i));
  48         Thread.sleep(500);
  49       }
  50     }
  51     catch (InterruptedException e) {}
  52     finally
  53     {
  54       log.info("{}: Closing the KafkaProducer", id);
  55       producer.close();
  56       log.info("{}: Produced {} messages in total, exiting!", id, produced);
  57       done = true;
  58     }
  59   }
  60
  61   CompletableFuture<Long> send(String key, String value)
  62   {
  63     final CompletableFuture<Long> result = new CompletableFuture<>();
  64     final long time = System.currentTimeMillis();
  65
  66     final ProducerRecord<String, String> record = new ProducerRecord<>(
  67         topic,  // Topic
  68         key,    // Key
  69         value   // Value
  70     );
  71
  72     producer.send(record, (metadata, e) ->
  73     {
  74       long now = System.currentTimeMillis();
  75       if (e == null)
  76       {
  77         // HANDLE SUCCESS
  78         produced++;
  79         log.debug(
  80             "{} - Sent key={} message={} partition={}/{} timestamp={} latency={}ms",
  81             id,
  82             record.key(),
  83             record.value(),
  84             metadata.partition(),
  85             metadata.offset(),
  86             metadata.timestamp(),
  87             now - time
  88         );
  89         result.complete(metadata.offset());
  90       }
  91       else
  92       {
  93         // HANDLE ERROR
  94         log.error(
  95             "{} - ERROR key={} timestamp={} latency={}ms: {}",
  96             id,
  97             record.key(),
  98             metadata == null ? -1 : metadata.timestamp(),
  99             now - time,
 100             e.toString()
 101         );
 102         result.completeExceptionally(e);
 103       }
 104     });
 105
 106     long now = System.currentTimeMillis();
 107     log.trace(
 108         "{} - Queued #{} key={} latency={}ms",
 109         id,
 110         value,
 111         record.key(),
 112         now - time
 113     );
 114
 115     return result;
 116   }
 117
 118
 119   public static void main(String[] args) throws Exception
 120   {
 121     String broker = ":9092";
 122     String topic = "test";
 123     String clientId = "DEV";
 124
 125     switch (args.length)
 126     {
 127       case 3:
 128         clientId = args[2];
 129       case 2:
 130         topic = args[1];
 131       case 1:
 132         broker = args[0];
 133     }
 134
 135     SimpleProducer instance = new SimpleProducer(broker, topic, clientId);
 136
 137     Runtime.getRuntime().addShutdownHook(new Thread(() ->
 138     {
 139       instance.running = false;
 140       while (!instance.done)
 141       {
 142         log.info("Waiting for main-thread...");
 143         try
 144         {
 145           Thread.sleep(1000);
 146         }
 147         catch (InterruptedException e) {}
 148       }
 149       log.info("Shutdown completed.");
 150     }));
 151
 152     log.info(
 153         "Running SimpleProducer: broker={}, topic={}, client-id={}",
 154         broker,
 155         topic,
 156         clientId);
 157     instance.run();
 158   }
 159 }