X-Git-Url: http://juplo.de/gitweb/?a=blobdiff_plain;f=src%2Fmain%2Fjava%2Fde%2Fjuplo%2Fkafka%2FEndlessConsumer.java;h=27c1e446cab68442bdf41ee6bb44baeb5c72e6c5;hb=66ff7d205e66616de8aaca94503dbbcd7d281f6d;hp=38dd36090eb7384eeb296b32027cf47b30bd6aad;hpb=9259b912d4294b7b21b49536ed1cc72175e1b2eb;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 38dd360..27c1e44 100644
--- a/src/main/java/de/juplo/kafka/EndlessConsumer.java
+++ b/src/main/java/de/juplo/kafka/EndlessConsumer.java
@@ -2,270 +2,101 @@ 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.WakeupException;
+import org.apache.kafka.clients.consumer.ConsumerRecord;
+import org.springframework.kafka.annotation.KafkaHandler;
+import org.springframework.kafka.annotation.KafkaListener;
+import org.springframework.kafka.config.KafkaListenerEndpointRegistry;
+import org.springframework.kafka.support.KafkaHeaders;
+import org.springframework.messaging.handler.annotation.Header;
+import org.springframework.messaging.handler.annotation.Payload;
 
-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.List;
+import java.util.Optional;
 
 
-@Slf4j
 @RequiredArgsConstructor
-public class EndlessConsumer implements Runnable
+@Slf4j
+@KafkaListener(
+    id = "${spring.kafka.client-id}",
+    idIsGroup = false,
+    topics = "${sumup.adder.topic}",
+    autoStartup = "false")
+public class EndlessConsumer
 {
-  private final ExecutorService executor;
   private final String id;
-  private final String topic;
-  private final Consumer<String, String> consumer;
-  private final java.util.function.Consumer<ConsumerRecord<String, String>> handler;
+  private final KafkaListenerEndpointRegistry registry;
+  private final RecordHandler recordHandler;
 
-  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()
+  @KafkaHandler
+  public void addNumber(
+    @Header(KafkaHeaders.RECEIVED_MESSAGE_KEY) String key,
+    @Header(KafkaHeaders.RECEIVED_TOPIC) String topic,
+    @Header(KafkaHeaders.RECEIVED_PARTITION_ID) Integer partition,
+    @Header(KafkaHeaders.OFFSET) Long offset,
+    @Payload MessageAddNumber message)
   {
-    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<String, String> records =
-            consumer.poll(Duration.ofSeconds(1));
-
-        // Do something with the data...
-        log.info("{} - Received {} messages", id, records.count());
-        for (ConsumerRecord<String, String> record : records)
-        {
           log.info(
               "{} - {}: {}/{} - {}={}",
               id,
-              record.offset(),
-              record.topic(),
-              record.partition(),
-              record.key(),
-              record.value()
+              offset,
+              topic,
+              partition,
+              key,
+              message
           );
 
-          handler.accept(record);
+          recordHandler.addNumber(topic, partition, offset, key, message);
 
           consumed++;
-
-          Integer partition = record.partition();
-          String key = record.key() == null ? "NULL" : record.key();
-          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(Exception e)
-    {
-      log.error("{} - Unexpected error: {}", id, e.toString(), e);
-      shutdown(e);
-    }
-    finally
-    {
-      log.info("{} - Consumer-Thread exiting", id);
-    }
   }
 
-  private void shutdown()
+  @KafkaHandler
+  public void calculateSum(
+    @Header(KafkaHeaders.RECEIVED_MESSAGE_KEY) String key,
+    @Header(KafkaHeaders.RECEIVED_TOPIC) String topic,
+    @Header(KafkaHeaders.RECEIVED_PARTITION_ID) Integer partition,
+    @Header(KafkaHeaders.OFFSET) Long offset,
+    @Payload MessageCalculateSum message)
   {
-    shutdown(null);
-  }
+          log.info(
+              "{} - {}: {}/{} - {}={}",
+              id,
+              offset,
+              topic,
+              partition,
+              key,
+              message
+          );
 
-  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();
-    }
-  }
+          recordHandler.calculateSum(topic, partition, offset, key, message);
 
-  public Map<Integer, Map<String, Long>> getSeen()
-  {
-    return seen;
+          consumed++;
   }
 
   public void start()
   {
-    lock.lock();
-    try
-    {
-      if (running)
-        throw new IllegalStateException("Consumer instance " + id + " is already running!");
+    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();
-    }
+    log.info("{} - Starting - consumed {} messages before", id, consumed);
+    registry.getListenerContainer(id).start();
   }
 
-  public synchronized void stop() throws ExecutionException, InterruptedException
+  public void stop()
   {
-    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();
-    }
-  }
+    if (!running())
+      throw new IllegalStateException("Consumer instance " + id + " is not running!");
 
-  @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);
-    }
+    log.info("{} - Stopping", id);
+    registry.getListenerContainer(id).stop();
+    log.info("{} - Stopped - consumed {} messages so far", 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();
-    }
+    return registry.getListenerContainer(id).isRunning();
   }
 }