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);
}
public synchronized Long endSum(String user)
if (!state.containsKey(user))
throw new IllegalStateException("No sumation for " + user + " in progress");
- return state.get(user);
+ return state.remove(user);
+ }
+
+ protected Map<String, Long> getState()
+ {
+ return state;
}
}