My Angular 4 Service:
@Injectable()
export class MyService {
private myArray: string[] = [];
constructor() { }
private calculate(result): void {
myArray.length = 0;
// Do some calculations and add results in myArray
}
public invokeCallBack(callBack: Function) {
// the function callBack returns an observable
// Rest calls are done in the callBack function
callBack().subscribe(
(result) => {
// Rest call is finished
this.calculate(result);
}
);
}
}
Other components call invokeCallBack(callBack) many times.
What will happen, if 2 (or more) rest calls are finished at the same time?
1) Will the method this.calculate(result) be called 2 times simultaneously? If that's the case, it could be possible that myArray has an inconsistent state, because 2 calculations take place at the same time (=> race condition). How could this problem be solved?
2) Or will this.calculate(result) always be called synchronous? If that's the case, only one calculation can take place at a time and therefore myArray is always (guaranteed) in a consistent state.
