juplo.de Git - demos/kafka/training/blob - src/main/java/de/juplo/kafka/EndlessProducer.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 javax.annotation.PreDestroy;
   9 import java.util.Properties;
  10 import java.util.concurrent.ExecutionException;
  11 import java.util.concurrent.ExecutorService;
  12 import java.util.concurrent.Future;
  13
  14
  15 @Slf4j
  16 public class EndlessProducer implements Runnable
  17 {
  18   private final ExecutorService executor;
  19   private final String id;
  20   private final String topic;
  21   private final int throttleMs;
  22   private final KafkaProducer<String, String> producer;
  23
  24   private boolean running = false;
  25   private long i = 0;
  26   private long produced = 0;
  27   private Future<?> future = null;
  28
  29   public EndlessProducer(
  30       ExecutorService executor,
  31       String bootstrapServer,
  32       String clientId,
  33       String topic,
  34       String acks,
  35       int throttleMs)
  36   {
  37     this.executor = executor;
  38     this.id = clientId;
  39     this.topic = topic;
  40     this.throttleMs = throttleMs;
  41
  42     Properties props = new Properties();
  43     props.put("bootstrap.servers", bootstrapServer);
  44     props.put("client.id", clientId);
  45     props.put("acks", acks);
  46     props.put("key.serializer", StringSerializer.class.getName());
  47     props.put("value.serializer", StringSerializer.class.getName());
  48
  49     this.producer = new KafkaProducer<>(props);
  50   }
  51
  52   @Override
  53   public void run()
  54   {
  55     try
  56     {
  57       for (; running; i++)
  58       {
  59         final long time = System.currentTimeMillis();
  60
  61         final ProducerRecord<String, String> record = new ProducerRecord<>(
  62             topic,                 // Topic
  63             Long.toString(i % 10), // Key
  64             Long.toString(i)       // Value
  65         );
  66
  67         producer.send(record, (metadata, e) ->
  68         {
  69           long now = System.currentTimeMillis();
  70           if (e == null)
  71           {
  72             // HANDLE SUCCESS
  73             produced++;
  74             log.debug(
  75                 "{} - Sent key={} message={} partition={}/{} timestamp={} latency={}ms",
  76                 id,
  77                 record.key(),
  78                 record.value(),
  79                 metadata.partition(),
  80                 metadata.offset(),
  81                 metadata.timestamp(),
  82                 now - time
  83             );
  84           }
  85           else
  86           {
  87             // HANDLE ERROR
  88             log.error(
  89                 "{} - ERROR key={} timestamp={} latency={}ms: {}",
  90                 id,
  91                 record.key(),
  92                 metadata == null ? -1 : metadata.timestamp(),
  93                 now - time,
  94                 e.toString()
  95             );
  96           }
  97         });
  98
  99         long now = System.currentTimeMillis();
 100         log.trace(
 101             "{} - Queued #{} key={} latency={}ms",
 102             id,
 103             i,
 104             record.key(),
 105             now - time
 106         );
 107
 108         if (throttleMs > 0)
 109         {
 110           try
 111           {
 112             Thread.sleep(throttleMs);
 113           }
 114           catch (InterruptedException e)
 115           {
 116             log.warn("{} - Interrupted while throttling!", e);
 117           }
 118         }
 119       }
 120
 121       log.info("{} - Done", id);
 122     }
 123     catch (Exception e)
 124     {
 125
 126     }
 127   }
 128
 129   public synchronized void start()
 130   {
 131     if (running)
 132       throw new IllegalStateException("Producer instance " + id + " is already running!");
 133
 134     log.info("{} - Starting - produced {} messages before", id, produced);
 135     running = true;
 136     future = executor.submit(this);
 137   }
 138
 139   public synchronized void stop() throws ExecutionException, InterruptedException
 140   {
 141     if (!running)
 142       throw new IllegalStateException("Producer instance " + id + " is not running!");
 143
 144     log.info("{} - Stopping...", id);
 145     running = false;
 146     future.get();
 147     log.info("{} - Stopped - produced {} messages so far", id, produced);
 148   }
 149
 150   @PreDestroy
 151   public void destroy() throws ExecutionException, InterruptedException
 152   {
 153     log.info("{} - Destroy!", id);
 154     try
 155     {
 156       stop();
 157     }
 158     catch (IllegalStateException e)
 159     {
 160       log.info("{} - Was already stopped", id);
 161     }
 162     finally
 163     {
 164       log.info("{} - Closing the KafkaProducer", id);
 165       producer.close();
 166       log.info("{}: Produced {} messages in total, exiting!", id, produced);
 167     }
 168   }
 169 }