From 84fed0ec1d13f26d636abcb38c201c9d13dbc46c Mon Sep 17 00:00:00 2001
From: Kai Moritz <kai@juplo.de>
Date: Sun, 10 Apr 2022 21:56:37 +0200
Subject: [PATCH] HealthIndicator implementiert

---
 .../java/de/juplo/kafka/EndlessConsumer.java  | 40 ++++++++++++++++++-
 1 file changed, 39 insertions(+), 1 deletion(-)

diff --git a/src/main/java/de/juplo/kafka/EndlessConsumer.java b/src/main/java/de/juplo/kafka/EndlessConsumer.java
index 18cef23..adebff1 100644
--- a/src/main/java/de/juplo/kafka/EndlessConsumer.java
+++ b/src/main/java/de/juplo/kafka/EndlessConsumer.java
@@ -10,6 +10,7 @@ import org.apache.kafka.common.serialization.StringDeserializer;
 import javax.annotation.PreDestroy;
 import java.time.Duration;
 import java.util.Arrays;
+import java.util.Optional;
 import java.util.Properties;
 import java.util.concurrent.ExecutionException;
 import java.util.concurrent.ExecutorService;
@@ -31,6 +32,7 @@ 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;
 
@@ -99,7 +101,7 @@ public class EndlessConsumer implements Runnable
     catch(Exception e)
     {
       log.error("{} - Unexpected error: {}", id, e.toString(), e);
-      shutdown();
+      shutdown(e);
     }
     finally
     {
@@ -110,11 +112,17 @@ 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
@@ -133,6 +141,7 @@ public class EndlessConsumer implements Runnable
 
       log.info("{} - Starting - consumed {} messages before", id, consumed);
       running = true;
+      exception = null;
       executor.submit(this);
     }
     finally
@@ -181,4 +190,33 @@ 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();
+    }
+  }
 }
-- 
2.20.1