1 package de.juplo.kafka;
4 import java.util.HashMap;
6 import java.util.Optional;
9 public class AdderBusinessLogic
11 private final Map<String, Long> state;
14 public AdderBusinessLogic()
16 this(new HashMap<>());
19 public AdderBusinessLogic(Map<String, Long> state)
25 public synchronized void startSum(String user)
27 if (state.containsKey(user))
28 throw new IllegalStateException("Sumation for " + user + " already in progress, state: " + state.get(user));
33 public synchronized Optional<Long> getSum(String user)
35 return Optional.ofNullable(state.get(user));
38 public synchronized Long endSum(String user)