X-Git-Url: https://juplo.de/gitweb/?a=blobdiff_plain;f=src%2Fmain%2Fjava%2Fde%2Fjuplo%2Fkafka%2FSumBusinessLogic.java;fp=src%2Fmain%2Fjava%2Fde%2Fjuplo%2Fkafka%2FSumBusinessLogic.java;h=74696a4e900810000bff2f674da881f5f3758aaf;hb=0b6377951bbeeb2443415bc2aa9c68988ee4c5af;hp=f7bf09f683437383f8d3391ba52d175848b201cb;hpb=83687565029b7fa3b8707f172b5e53b58fc5bcba;p=demos%2Fkafka%2Ftraining

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)