juplo.de Git - demos/kafka/training/blob - src/main/java/de/juplo/kafka/SumBusinessLogic.java

   1 package de.juplo.kafka;
   2
   3 import java.util.HashMap;
   4 import java.util.Map;
   5
   6
   7 public class SumBusinessLogic
   8 {
   9   private final Map<String, Long> state;
  10
  11
  12   public SumBusinessLogic()
  13   {
  14     this(new HashMap<>());
  15   }
  16
  17   public SumBusinessLogic(Map<String, Long> state)
  18   {
  19     this.state = state;
  20   }
  21
  22
  23   public synchronized void startSum(String user)
  24   {
  25     if (state.containsKey(user))
  26       throw new IllegalStateException("Sumation for " + user + " already in progress, state: " + state.get(user));
  27
  28     state.put(user, 0l);
  29   }
  30 }