// newQueryFactory(Boolean assertCRUD, Boolean enforceFLS, Boolean includeSelectorFields)
fflib_QueryFactory query = newQueryFactory(true, true, true);

public with sharing class MyObjectsSelector extends fflib_SObjectSelector
{
    public MyObjectsSelector(Boolean includeFieldSetFields, Boolean enforceCRUD, Boolean enforceFLS)
    {
        super(includeFieldSetFields, enforceCRUD, enforceFLS);
    }
}

public class Application
{
      public static final fflib_Application.SelectorFactory selector =
       new fflib_Application.SelectorFactory(
          new Map<SObjectType, Type> {
             MyObject__c.sObjectType => MyObjectsSelector.class
          }
       );
}

public with sharing class MyObjectsSelector extends fflib_SObjectSelector
{
    public static IAccountsSelector newInstance(){
        return (IMyObjectsSelector) Application.selector.newInstance(MyObject__c.SObjectType);
    }
}

List<MyObject__c> records = MyObjectsSelector.newInstance().selectById(recIds);