X-Git-Url: http://juplo.de/gitweb/?a=blobdiff_plain;f=src%2Fmain%2Fjava%2Fde%2Fjuplo%2Fkafka%2FAdderBusinessLogic.java;h=d525182ea539b82c1da1e4ac8c88943f80d0490a;hb=2eb3c45c9438a20777b0110defa593dd45c64511;hp=549228ce656075a5f6445b0fabe4066aefb98d8d;hpb=f4848341ef2fee62e3c62c63deed277a4f1a2d8a;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 549228c..d525182 100644
--- a/src/main/java/de/juplo/kafka/AdderBusinessLogic.java
+++ b/src/main/java/de/juplo/kafka/AdderBusinessLogic.java
@@ -8,7 +8,7 @@ import java.util.Optional;
 
 public class AdderBusinessLogic
 {
-  private final Map<String, Long> state;
+  private final Map<String, AdderResult> state;
 
 
   public AdderBusinessLogic()
@@ -16,27 +16,40 @@ public class AdderBusinessLogic
     this(new HashMap<>());
   }
 
-  public AdderBusinessLogic(Map<String, Long> state)
+  public AdderBusinessLogic(Map<String, AdderResult> state)
   {
     this.state = state;
   }
 
 
-  public synchronized void startSum(String user)
+  public synchronized Optional<Long> getSum(String user)
   {
-    if (state.containsKey(user))
-      throw new IllegalStateException("Sumation for " + user + " already in progress, state: " + state.get(user));
+    return Optional.ofNullable(state.get(user)).map(result -> result.sum);
+  }
 
-    state.put(user, 0l);
+  public synchronized void addToSum(String user, Integer value)
+  {
+    if (value == null || value < 1)
+      throw new IllegalArgumentException("Not a positive number: " + value);
+
+    long sum =
+        Optional
+            .ofNullable(state.get(user))
+            .map(result -> result.sum)
+            .orElse(0l);
+    state.put(user, new AdderResult(value, sum + value));
   }
 
-  public synchronized Optional<Long> getSum(String user)
+  public synchronized AdderResult calculate(String user)
   {
-    return Optional.ofNullable(state.get(user));
+    if (!state.containsKey(user))
+      throw new IllegalStateException("No sumation for " + user + " in progress");
+
+    return state.remove(user);
   }
 
-  public synchronized Long endSum(String user)
+  protected Map<String, AdderResult> getState()
   {
-    return null;
+    return state;
   }
 }