Merge der überarbeiteten Compose-Konfiguration ('rebalance-listener')

[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 03a89dc..e5ef7d0 100644 (file)
--- a/src/main/java/de/juplo/kafka/EndlessConsumer.java
+++ b/src/main/java/de/juplo/kafka/EndlessConsumer.java
@@ -23,6 +23,7 @@ import java.util.concurrent.locks.ReentrantLock;
 public class EndlessConsumer implements Runnable
 {
   private final ExecutorService executor;
+  private final PartitionStatisticsRepository repository;
   private final String bootstrapServer;
   private final String groupId;
   private final String id;
@@ -32,6 +33,7 @@ public class EndlessConsumer implements Runnable
   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;
 
@@ -41,6 +43,7 @@ public class EndlessConsumer implements Runnable
 
   public EndlessConsumer(
       ExecutorService executor,
+      PartitionStatisticsRepository repository,
       String bootstrapServer,
       String groupId,
       String clientId,
@@ -48,6 +51,7 @@ public class EndlessConsumer implements Runnable
       String autoOffsetReset)
   {
     this.executor = executor;
+    this.repository = repository;
     this.bootstrapServer = bootstrapServer;
     this.groupId = groupId;
     this.id = clientId;
@@ -90,6 +94,7 @@ public class EndlessConsumer implements Runnable
                   tp.partition(),
                   key);
             }
+            repository.save(new StatisticsDocument(tp.partition(), removed));
           });
         }
 
@@ -99,7 +104,12 @@ public class EndlessConsumer implements Runnable
           partitions.forEach(tp ->
           {
             log.info("{} - adding partition: {}", id, tp);
-            seen.put(tp.partition(), new HashMap<>());
+            seen.put(
+                tp.partition(),
+                repository
+                    .findById(Integer.toString(tp.partition()))
+                    .map(document -> document.statistics)
+                    .orElse(new HashMap<>()));
           });
         }
       });
@@ -145,7 +155,7 @@ public class EndlessConsumer implements Runnable
     catch(Exception e)
     {
       log.error("{} - Unexpected error: {}", id, e.toString(), e);
-      shutdown();
+      shutdown(e);
     }
     finally
     {
@@ -156,11 +166,17 @@ public class EndlessConsumer implements Runnable
   }
 
   private void shutdown()
+  {
+    shutdown(null);
+  }
+
+  private void shutdown(Exception e)
   {
     lock.lock();
     try
     {
       running = false;
+      exception = e;
       condition.signal();
     }
     finally
@@ -184,6 +200,7 @@ public class EndlessConsumer implements Runnable
 
       log.info("{} - Starting - consumed {} messages before", id, consumed);
       running = true;
+      exception = null;
       executor.submit(this);
     }
     finally
@@ -232,4 +249,33 @@ public class EndlessConsumer implements Runnable
       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();
+    }
+  }
 }