Tag: machine

I created that state machine To handle events. I'm not sure about my implementation first Since I do not use a transition table or the like, I simply enter the next event / state that must happen. I think that is cleaner than calling method event b to treat within the method event a, Law?

Secondlybecause some of the methods have parameters – and that's not swift where enum members can have mapped values, I've added a parameter about it withObj Dispute. I do not see any problem with that, but I would like to know if this is a bit confusing / hurting from your point of view.

I also found this useful for asynchronous tasksAfter the task completes, I set the resulting value to a local variable and update the status packData Use this stored value among many other existing values. This value is packed in a byte array that can not be used in blocks. So this was a useful workaround – although I have not tested it yet.

States are defined via enum how so:

typedef NS_ENUM(NSUInteger, ExampleState) {
    ExampleStateIdle,
    ExampleStateWaitingForAsyncTask,
    ExampleStateReadyToPack,
    ExampleStateRespond,
    ExampleStateSomethingInProgress,
    ExampleStateSomething2InProgress,
    ExampleStateComplete
};

Here I define a method to treat each event using helper methods. I also have an additional argument for every state that could have one associated value,

- (void)updateState:(ExampleState)state withObj:(id)obj  {

    self.currentState = state;

    switch (state) {
        case ExampleStateWaitingForAsyncTask:
            (self getAsyncInfo);
            break;
        case ExampleStateReadyToPack:
            (self packData);
            break;
        case ExampleStateRespond:
            (self respond:obj);
            break;
        case ExampleStateComplete:
            (self showPopup);
            break;
        default:
            break;
    }
}

Example use:

-(void)packData {
    NSData *data = (NSData dataWithBytes:&result length:resultIndex);
    // next step is to respond to `client`/`central` with data
    (self updateState:ExampleStateRespond withObj:data);
}