Increment by 1, return previous

Atomically increments by one 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.

Objective-CSwift

- (void)getAndIncrementWithCounterName:(NSString * _Nonnull)counterName responseHandler:^(NSInteger)responseHandler errorHandler:^(Fault * _Nonnull)errorHandler;

func getAndIncrement(counterName: String, responseHandler: ((Int) -> Void)!, errorHandler: ((Fault) -> Void)!)

where:

Argument	Description
counterName	name of the counter to increment.

Example

Objective-CSwift

[Backendless.shared.counters getAndIncrementWithCounterName:@"MyCounter" responseHandler:^(NSInteger value) {
    NSLog(@"Previous value = %li", value);
} errorHandler:^(Fault *fault) {
    NSLog(@"Error: %@", fault.message);
}];

//

id<IAtomic> myCounter = [Backendless.shared.counters ofCounterName:@"MyCounter"];
[myCounter getAndIncrementWithResponseHandler:^(NSInteger value) {
    NSLog(@"Previous value = %li", value);
} errorHandler:^(Fault *fault) {
    NSLog(@"Error: %@", fault.message);
}];

Backendless.shared.counters.getAndIncrement(counterName: "MyCounter", responseHandler: { value in
    print("Previous value = \(value)")
}, errorHandler: { fault in
    print("Error: \(fault.message ?? "")")
})

//

let myCounter = Backendless.shared.counters.of(counterName: "MyCounter")
myCounter.getAndIncrement(responseHandler: { value in
    print("Previous value = \(value)")
}, errorHandler: { fault in
    print("Error: \(fault.message ?? "")")
})

Codeless Reference

where:

Argument	Description
counter name	Name of the counter whose value must be incremented.
increment by	Specify the number to increment the value by.
return previous value	When this box is checked, the operation returns the previous value of the counter.

Returns the previous value of the counter.

Consider the following counter:

The example below increments the value of the "CarsParkingLot" by 1. This operation returns 0, since the return previous value box is checked. To avoid confusion, the value was  incremented by 1, even though the return value is 0.

The result of this operation will look as shown below after the Codeless logic runs, as you can see the value of the counter was incremented by 1.