X-Git-Url: https://juplo.de/gitweb/?a=blobdiff_plain;f=src%2Fmain%2Fjava%2Fde%2Fjuplo%2Fkafka%2FSumBusinessLogic.java;h=27ddebb8b4e1a2bf8d62869337244cec75ebb1b5;hb=5f35354fd694f78599d66ee9e01fb4c0d89cc5bb;hp=5cb906a8a8a0b41cf8aa84e1430cf197ff7c1d57;hpb=614ab1f07d1cae49c06b8bcbd6132e0aa5827246;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 5cb906a..27ddebb 100644
--- a/src/main/java/de/juplo/kafka/SumBusinessLogic.java
+++ b/src/main/java/de/juplo/kafka/SumBusinessLogic.java
@@ -31,6 +31,30 @@ public class SumBusinessLogic
 
   public synchronized Optional<Long> getSum(String user)
   {
-    return Optional.empty();
+    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.get(user);
+  }
+
+  protected Map<String, Long> getState()
+  {
+    return state;
   }
 }