public getCountByFilter(correlationId: Context, filter: FilterParams):Promise<number>{
  
    let filterCondition: string = this.filterCondition(filter);

    return super.getCountByFilter(correlationId, filterCondition);

}

// ...

let counter1: number = await persistence.getCountByFilter(
    null, FilterParams.fromTuples('name', 'name_1')
);