Increment by N, return previous¶
Atomically adds the given value to the current value and returns the previous value of the counter. It is possible that multiple concurrent client requests may receive the same previous value. This occurs since only the incrementing part of the logic is atomic, the retrieval of the value before it is incremented is not.
Future<int> Backendless.counters.getAndAdd(String counterName, int value); IAtomic counter = Backendless.counters.of(String counterName); Future<int> counter.getAndAdd(int value);
where:
Argument | Description |
---|---|
counterName |
name of the counter to update. |
value |
number to add to the current counter value |
Example¶
Function callback = (counterValue) => print("previous counter value is - $counterValue"); Backendless.counters.getAndAdd("my counter", 2000).then(callback); IAtomic myCounter = Backendless.counters.of("my counter"); myCounter.getAndAdd(2000).then(callback);