Scheduled APEX - dynamic run time batch instance (Intriguing Design Pattern)

ApexScheduler.cls

global class ApexScheduler implements Schedulable {
    String  className;

    global ApexScheduler(String className){
        this.className = className;
    }

    public Interface IScheduler {
        void execute(SchedulableContext sc);
    }

    global void execute(SchedulableContext sc) {
        Type classToSchedule = Type.forName(className);
        if(classToSchedule !=null) {
            IScheduler schedulerCls = (IScheduler) classToSchedule.NewInstance();
            schedulerCls.execute(sc);
        }
    }
}

SampleBatch.cls

global class SampleBatch implements Database.Batchable<sObject> {
    global Database.QueryLocator start(Database.BatchableContext BC){
      return Database.getQueryLocator('SELECT Id, ContactId FROM Case WHERE CreatedDate=TODAY');
    }

    global void execute(Database.BatchableContext BC, List<Case> scope){
        for(Case caseRec : scope){
          caseRec.Subject = 'X'+System.now();
        }
        update scope;
    }

    global void finish(Database.BatchableContext BC){

    }
}

SampleBatchScheduler.cls

global class SampleBatchScheduler implements ApexScheduler.IScheduler {

    global void execute(SchedulableContext sc) {
      Database.executeBatch(new SampleBatch());
    }
}

SchedulingScript.apex

 System.schedule('Case Update Job ',  <cron exp>, new ApexScheduler('SampleBatchScheduler));