Die Offsets werden ausgegeben, wenn eine Partition zugeteilt/entzogen wird

[demos/kafka/training] / src / main / java / de / juplo / kafka / EndlessConsumer.java

diff --git a/src/main/java/de/juplo/kafka/EndlessConsumer.java b/src/main/java/de/juplo/kafka/EndlessConsumer.java
index 9aa8152..6af3765 100644 (file)
--- a/src/main/java/de/juplo/kafka/EndlessConsumer.java
+++ b/src/main/java/de/juplo/kafka/EndlessConsumer.java
@@ -14,8 +14,9 @@ import java.time.Duration;
 import java.util.*;
 import java.util.concurrent.ExecutionException;
 import java.util.concurrent.ExecutorService;
-import java.util.concurrent.Future;
-import java.util.concurrent.atomic.AtomicBoolean;
+import java.util.concurrent.locks.Condition;
+import java.util.concurrent.locks.Lock;
+import java.util.concurrent.locks.ReentrantLock;
 
 
 @Slf4j
@@ -28,12 +29,16 @@ public class EndlessConsumer implements Runnable
   private final String topic;
   private final String autoOffsetReset;
 
-  private AtomicBoolean running = new AtomicBoolean();
+  private final Lock lock = new ReentrantLock();
+  private final Condition condition = lock.newCondition();
+  private boolean running = false;
+  private Exception exception;
   private long consumed = 0;
   private KafkaConsumer<String, String> consumer = null;
-  private Future<?> future = null;
 
-  private final Map<Integer, Map<String, Integer>> seen = new HashMap<>();
+
+  private final Map<Integer, Map<String, Long>> seen = new HashMap<>();
+  private final Map<Integer, Long> offsets = new HashMap<>();
 
 
   public EndlessConsumer(
@@ -74,13 +79,42 @@ public class EndlessConsumer implements Runnable
         @Override
         public void onPartitionsRevoked(Collection<TopicPartition> partitions)
         {
-          partitions.forEach(tp -> seen.remove(tp.partition()));
+          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 -> seen.put(tp.partition(), new HashMap<>()));
+          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<>());
+          });
         }
       });
 
@@ -106,12 +140,12 @@ public class EndlessConsumer implements Runnable
 
           Integer partition = record.partition();
           String key = record.key() == null ? "NULL" : record.key();
-          Map<String, Integer> byKey = seen.get(partition);
+          Map<String, Long> byKey = seen.get(partition);
 
           if (!byKey.containsKey(key))
-            byKey.put(key, 0);
+            byKey.put(key, 0l);
 
-          int seenByKey = byKey.get(key);
+          long seenByKey = byKey.get(key);
           seenByKey++;
           byKey.put(key, seenByKey);
         }
@@ -120,60 +154,82 @@ public class EndlessConsumer implements Runnable
     catch(WakeupException e)
     {
       log.info("{} - RIIING!", id);
+      shutdown();
     }
     catch(Exception e)
     {
       log.error("{} - Unexpected error: {}", id, e.toString(), e);
-      running.set(false); // Mark the instance as not running
+      shutdown(e);
     }
     finally
     {
       log.info("{} - Closing the KafkaConsumer", id);
       consumer.close();
+      log.info("{} - Consumer-Thread exiting", id);
+    }
+  }
 
-      for (Integer partition : seen.keySet())
-      {
-        Map<String, Integer> byKey = seen.get(partition);
-        for (String key : byKey.keySet())
-        {
-          log.info(
-              "{} - Seen {} messages for partition={}|key={}",
-              id,
-              byKey.get(key),
-              partition,
-              key);
-        }
-      }
+  private void shutdown()
+  {
+    shutdown(null);
+  }
 
-      log.info("{} - Consumer-Thread exiting", id);
+  private void shutdown(Exception e)
+  {
+    lock.lock();
+    try
+    {
+      running = false;
+      exception = e;
+      condition.signal();
+    }
+    finally
+    {
+      lock.unlock();
     }
   }
 
-  public Map<Integer, Map<String, Integer>> getSeen()
+  public Map<Integer, Map<String, Long>> getSeen()
   {
     return seen;
   }
 
-  public synchronized void start()
+  public void start()
   {
-    boolean stateChanged = running.compareAndSet(false, true);
-    if (!stateChanged)
-      throw new RuntimeException("Consumer instance " + id + " is already running!");
+    lock.lock();
+    try
+    {
+      if (running)
+        throw new IllegalStateException("Consumer instance " + id + " is already running!");
 
-    log.info("{} - Starting - consumed {} messages before", id, consumed);
-    future = executor.submit(this);
+      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
   {
-    boolean stateChanged = running.compareAndSet(true, false);
-    if (!stateChanged)
-      throw new RuntimeException("Consumer instance " + id + " is not running!");
-
-    log.info("{} - Stopping", id);
-    consumer.wakeup();
-    future.get();
-    log.info("{} - Stopped - consumed {} messages so far", id, consumed);
+    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
@@ -188,9 +244,42 @@ public class EndlessConsumer implements Runnable
     {
       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();
+    }
+  }
 }