X-Git-Url: https://juplo.de/gitweb/?a=blobdiff_plain;ds=sidebyside;f=src%2Fmain%2Fjava%2Fde%2Fjuplo%2Fkafka%2FSumBusinessLogic.java;h=a767aea9456e11ab80243c8c2d9e33746195caeb;hb=43be1c56d6205a70bc2740ef105f329d5e7461cc;hp=73db4cff6ac96dd4a887c773d999f82e4c010597;hpb=5592437b9ad0caa7c9dd28b6248cc786fae625d3;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 73db4cf..a767aea 100644
--- a/src/main/java/de/juplo/kafka/SumBusinessLogic.java
+++ b/src/main/java/de/juplo/kafka/SumBusinessLogic.java
@@ -34,8 +34,27 @@ public class SumBusinessLogic
     return Optional.ofNullable(state.get(user));
   }
 
+  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)
   {
-    return null;
+    if (!state.containsKey(user))
+      throw new IllegalStateException("No sumation for " + user + " in progress");
+
+    return state.remove(user);
+  }
+
+  protected Map<String, Long> getState()
+  {
+    return state;
   }
 }