}
- 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));
+ }
- 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))
+ .orElse(0l);
+ state.put(user, 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 new AdderResult(66, state.remove(user));
+ }
+
+ protected Map<String, Long> getState()
+ {
+ return state;
}
}