X-Git-Url: http://juplo.de/gitweb/?a=blobdiff_plain;f=src%2Fmain%2Fjava%2Fde%2Fjuplo%2Fkafka%2FEndlessConsumer.java;h=87780b4e3cc22d679452a10abecd5dcafc30b885;hb=a9200a876060edc8683dfd6d0d16c23407c189ad;hp=b173b12cea4be841c82a944695bc702314c28e86;hpb=fb966920f18413076a28876ffcd125c84f9a6f06;p=demos%2Fkafka%2Ftraining

diff --git a/src/main/java/de/juplo/kafka/EndlessConsumer.java b/src/main/java/de/juplo/kafka/EndlessConsumer.java
index b173b12..87780b4 100644
--- a/src/main/java/de/juplo/kafka/EndlessConsumer.java
+++ b/src/main/java/de/juplo/kafka/EndlessConsumer.java
@@ -2,285 +2,39 @@ package de.juplo.kafka;
 
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
-import org.apache.kafka.clients.consumer.*;
-import org.apache.kafka.common.TopicPartition;
-import org.apache.kafka.common.errors.RecordDeserializationException;
-import org.apache.kafka.common.errors.WakeupException;
+import org.apache.kafka.clients.consumer.ConsumerRecord;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.kafka.annotation.KafkaListener;
+import org.springframework.stereotype.Component;
 
-import javax.annotation.PreDestroy;
-import java.time.Duration;
-import java.util.*;
-import java.util.concurrent.ExecutionException;
-import java.util.concurrent.ExecutorService;
-import java.util.concurrent.locks.Condition;
-import java.util.concurrent.locks.Lock;
-import java.util.concurrent.locks.ReentrantLock;
+import java.util.function.Consumer;
 
 
+@Component
 @Slf4j
 @RequiredArgsConstructor
-public class EndlessConsumer<K, V> implements Runnable
+public class EndlessConsumer<K, V>
 {
-  private final ExecutorService executor;
-  private final String id;
-  private final String topic;
-  private final Consumer<K, V> consumer;
-  private final java.util.function.Consumer<ConsumerRecord<K, V>> handler;
-
-  private final Lock lock = new ReentrantLock();
-  private final Condition condition = lock.newCondition();
-  private boolean running = false;
-  private Exception exception;
-  private long consumed = 0;
-
-  private final Map<Integer, Map<String, Long>> seen = new HashMap<>();
-  private final Map<Integer, Long> offsets = new HashMap<>();
-
-
-  @Override
-  public void run()
-  {
-    try
-    {
-      log.info("{} - Subscribing to topic {}", id, topic);
-      consumer.subscribe(Arrays.asList(topic), new ConsumerRebalanceListener()
-      {
-        @Override
-        public void onPartitionsRevoked(Collection<TopicPartition> partitions)
-        {
-          partitions.forEach(tp ->
-          {
-            Integer partition = tp.partition();
-            Long newOffset = consumer.position(tp);
-            Long oldOffset = offsets.remove(partition);
-            log.info(
-                "{} - removing partition: {}, consumed {} records (offset {} -> {})",
-                id,
-                partition,
-                newOffset - oldOffset,
-                oldOffset,
-                newOffset);
-            Map<String, Long> removed = seen.remove(partition);
-            for (String key : removed.keySet())
-            {
-              log.info(
-                  "{} - Seen {} messages for partition={}|key={}",
-                  id,
-                  removed.get(key),
-                  partition,
-                  key);
-            }
-          });
-        }
-
-        @Override
-        public void onPartitionsAssigned(Collection<TopicPartition> partitions)
-        {
-          partitions.forEach(tp ->
-          {
-            Integer partition = tp.partition();
-            Long offset = consumer.position(tp);
-            log.info("{} - adding partition: {}, offset={}", id, partition, offset);
-            offsets.put(partition, offset);
-            seen.put(partition, new HashMap<>());
-          });
-        }
-      });
-
-      while (true)
-      {
-        ConsumerRecords<K, V> records =
-            consumer.poll(Duration.ofSeconds(1));
-
-        // Do something with the data...
-        log.info("{} - Received {} messages", id, records.count());
-        for (ConsumerRecord<K, V> record : records)
-        {
-          log.info(
-              "{} - {}: {}/{} - {}={}",
-              id,
-              record.offset(),
-              record.topic(),
-              record.partition(),
-              record.key(),
-              record.value()
-          );
-
-          handler.accept(record);
-
-          consumed++;
-
-          Integer partition = record.partition();
-          String key = record.key() == null ? "NULL" : record.key().toString();
-          Map<String, Long> byKey = seen.get(partition);
-
-          if (!byKey.containsKey(key))
-            byKey.put(key, 0l);
-
-          long seenByKey = byKey.get(key);
-          seenByKey++;
-          byKey.put(key, seenByKey);
-        }
-      }
-    }
-    catch(WakeupException e)
-    {
-      log.info("{} - RIIING! Request to stop consumption - commiting current offsets!", id);
-      consumer.commitSync();
-      shutdown();
-    }
-    catch(RecordDeserializationException e)
-    {
-      TopicPartition tp = e.topicPartition();
-      long offset = e.offset();
-      log.error(
-          "{} - Could not deserialize  message on topic {} with offset={}: {}",
-          id,
-          tp,
-          offset,
-          e.getCause().toString());
-
-      consumer.commitSync();
-      shutdown(e);
-    }
-    catch(Exception e)
-    {
-      log.error("{} - Unexpected error: {}", id, e.toString(), e);
-      shutdown(e);
-    }
-    finally
-    {
-      log.info("{} - Consumer-Thread exiting", id);
-    }
-  }
-
-  private void shutdown()
-  {
-    shutdown(null);
-  }
-
-  private void shutdown(Exception e)
-  {
-    lock.lock();
-    try
-    {
-      try
-      {
-        log.info("{} - Unsubscribing from topic {}", id, topic);
-        consumer.unsubscribe();
-      }
-      catch (Exception ue)
-      {
-        log.error(
-            "{} - Error while unsubscribing from topic {}: {}",
-            id,
-            topic,
-            ue.toString());
-      }
-      finally
-      {
-        running = false;
-        exception = e;
-        condition.signal();
-      }
-    }
-    finally
-    {
-      lock.unlock();
-    }
-  }
-
-  public Map<Integer, Map<String, Long>> getSeen()
-  {
-    return seen;
-  }
-
-  public void start()
-  {
-    lock.lock();
-    try
-    {
-      if (running)
-        throw new IllegalStateException("Consumer instance " + id + " is already running!");
-
-      log.info("{} - Starting - consumed {} messages before", id, consumed);
-      running = true;
-      exception = null;
-      executor.submit(this);
-    }
-    finally
-    {
-      lock.unlock();
-    }
-  }
-
-  public synchronized void stop() throws ExecutionException, InterruptedException
-  {
-    lock.lock();
-    try
-    {
-      if (!running)
-        throw new IllegalStateException("Consumer instance " + id + " is not running!");
-
-      log.info("{} - Stopping", id);
-      consumer.wakeup();
-      condition.await();
-      log.info("{} - Stopped - consumed {} messages so far", id, consumed);
-    }
-    finally
-    {
-      lock.unlock();
-    }
-  }
-
-  @PreDestroy
-  public void destroy() throws ExecutionException, InterruptedException
-  {
-    log.info("{} - Destroy!", id);
-    try
-    {
-      stop();
-    }
-    catch (IllegalStateException e)
-    {
-      log.info("{} - Was already stopped", id);
-    }
-    catch (Exception e)
-    {
-      log.error("{} - Unexpected exception while trying to stop the consumer", id, e);
-    }
-    finally
-    {
-      log.info("{}: Consumed {} messages in total, exiting!", id, consumed);
-    }
-  }
-
-  public boolean running()
-  {
-    lock.lock();
-    try
-    {
-      return running;
-    }
-    finally
-    {
-      lock.unlock();
-    }
-  }
-
-  public Optional<Exception> exitStatus()
-  {
-    lock.lock();
-    try
-    {
-      if (running)
-        throw new IllegalStateException("No exit-status available: Consumer instance " + id + " is running!");
-
-      return Optional.ofNullable(exception);
-    }
-    finally
-    {
-      lock.unlock();
-    }
+  @Value("${consumer.client-id}")
+  String id;
+  @Autowired
+  Consumer<ConsumerRecord<K, V>> handler;
+
+
+  @KafkaListener(topics = "${consumer.topic}")
+  public void receive(ConsumerRecord<K, V> record)
+  {
+    log.info(
+        "{} - {}: {}/{} - {}={}",
+        id,
+        record.offset(),
+        record.topic(),
+        record.partition(),
+        record.key(),
+        record.value()
+    );
+
+    handler.accept(record);
   }
 }