From: Kai Moritz <kai@juplo.de>
Date: Sat, 13 Aug 2022 14:10:28 +0000 (+0200)
Subject: GRÜN: Erwartungen implementiert
X-Git-Url: http://juplo.de/gitweb/?a=commitdiff_plain;h=0b6377951bbeeb2443415bc2aa9c68988ee4c5af;p=demos%2Fkafka%2Ftraining

GRÜN: Erwartungen implementiert
---

diff --git a/src/main/java/de/juplo/kafka/SumBusinessLogic.java b/src/main/java/de/juplo/kafka/SumBusinessLogic.java
index f7bf09f..74696a4 100644
--- a/src/main/java/de/juplo/kafka/SumBusinessLogic.java
+++ b/src/main/java/de/juplo/kafka/SumBusinessLogic.java
@@ -36,6 +36,13 @@ public class SumBusinessLogic
 
   public synchronized void addToSum(String user, Integer value)
   {
+    if (!state.containsKey(user))
+      throw new IllegalStateException("No sumation for " + user + " in progress");
+    if (value == null || value < 1)
+      throw new IllegalArgumentException("Not a positive number: " + value);
+
+    long result = state.get(user) + value;
+    state.put(user, result);
   }
 
   public synchronized Long endSum(String user)