}
- public synchronized void startSum(String user)
- {
- if (state.containsKey(user))
- throw new IllegalStateException("Sumation for " + user + " already in progress, state: " + state.get(user));
-
- 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);
+ long sum =
+ Optional
+ .ofNullable(state.get(user))
+ .orElse(0l);
+ state.put(user, sum + value);
}
- public synchronized Long endSum(String user)
+ public synchronized AdderResult calculate(String user)
{
if (!state.containsKey(user))
throw new IllegalStateException("No sumation for " + user + " in progress");
- return state.get(user);
+ return new AdderResult(66, state.remove(user));
}
protected Map<String, Long> getState()