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diff --git a/src/main/java/de/juplo/kafka/AdderRecordHandler.java b/src/main/java/de/juplo/kafka/AdderRecordHandler.java
new file mode 100644
index 0000000..ecd47bc
--- /dev/null
+++ b/src/main/java/de/juplo/kafka/AdderRecordHandler.java
@@ -0,0 +1,54 @@
+package de.juplo.kafka;
+
+import lombok.extern.slf4j.Slf4j;
+import org.apache.kafka.clients.consumer.ConsumerRecord;
+
+import java.util.HashMap;
+import java.util.Map;
+
+
+@Slf4j
+public class AdderRecordHandler implements RecordHandler<String, String>
+{
+  private final Map<Integer, AdderBusinessLogic> state = new HashMap<>();
+
+
+  @Override
+  public void accept(ConsumerRecord<String, String> record)
+  {
+    Integer partition = record.partition();
+    String user = record.key();
+    String message = record.value();
+    switch (message)
+    {
+      case "START":
+        state.get(partition).startSum(user);
+        break;
+
+      case "END":
+        Long result = state.get(partition).endSum(user);
+        log.info("New result for {}: {}", user, result);
+        break;
+
+      default:
+        state.get(partition).addToSum(user, Integer.parseInt(message));
+        break;
+    }
+  }
+
+  protected void addPartition(Integer partition, Map<String, Long> state)
+  {
+    this.state.put(partition, new AdderBusinessLogic(state));
+  }
+
+  protected Map<String, Long> removePartition(Integer partition)
+  {
+    return this.state.remove(partition).getState();
+  }
+
+
+  public Map<Integer, AdderBusinessLogic> getState()
+  {
+    return state;
+  }
+}