X-Git-Url: http://juplo.de/gitweb/?a=blobdiff_plain;f=src%2Fmain%2Fjava%2Fde%2Fjuplo%2Fkafka%2FAdderBusinessLogic.java;h=1f3d9aa2e67db2934b836d4093cb7485d354f881;hb=de4f94c45fd0678777fecba4dbcb63f89e0ebafa;hp=a3848c466fe1dde9d393a4b7718fc541b0b8b330;hpb=47657918b484fad60ac4062177cfeb569275d3d3;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 a3848c4..1f3d9aa 100644
--- a/src/main/java/de/juplo/kafka/AdderBusinessLogic.java
+++ b/src/main/java/de/juplo/kafka/AdderBusinessLogic.java
@@ -3,6 +3,7 @@ package de.juplo.kafka;
 
 import java.util.HashMap;
 import java.util.Map;
+import java.util.Optional;
 
 
 public class AdderBusinessLogic
@@ -28,4 +29,33 @@ public class AdderBusinessLogic
 
     state.put(user, 0l);
   }
+
+  public synchronized Optional<Long> getSum(String user)
+  {
+    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;
+  }
 }