X-Git-Url: http://juplo.de/gitweb/?a=blobdiff_plain;f=src%2Fmain%2Fjava%2Fde%2Fjuplo%2Fkafka%2FAdderBusinessLogic.java;h=1f3d9aa2e67db2934b836d4093cb7485d354f881;hb=de4f94c45fd0678777fecba4dbcb63f89e0ebafa;hp=9fd5b0df9c0b187fdaa125d51e1dfb70fb2cae79;hpb=25ffddd625259ea3011639eae4ce311a7b41394d;p=demos%2Fkafka%2Ftraining

diff --git a/src/main/java/de/juplo/kafka/AdderBusinessLogic.java b/src/main/java/de/juplo/kafka/AdderBusinessLogic.java
index 9fd5b0d..1f3d9aa 100644
--- a/src/main/java/de/juplo/kafka/AdderBusinessLogic.java
+++ b/src/main/java/de/juplo/kafka/AdderBusinessLogic.java
@@ -34,4 +34,28 @@ public class AdderBusinessLogic
   {
     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)
+  {
+    if (!state.containsKey(user))
+      throw new IllegalStateException("No sumation for " + user + " in progress");
+
+    return state.remove(user);
+  }
+
+  protected Map<String, Long> getState()
+  {
+    return state;
+  }
 }