Fail-Fast instead of Fire-and-Forget

Fail-Fast

fail-safe, fail-fast, fire-and-forget

Fail Fast means, when something goes wrong, you must show an error as soon as possible, so that you can take an action to solve the problem.

With fire-and-forget (when you have no any response) there is nothing you can do, when something went wrong.

Here is few points to follow fail-fast behavior:

• assertions;
• meaningful exceptions;
• response for each request.

Data transfer object, Business object & Data access object...

Introduction

To simplify data interactions and increase the code understanding the following entities usually are used:

• Value object (VO);
• Business object (BO);
• Persistence object (PO); 
• Data transfer object (DTO or TO) ;
• Data access object (DAO);

So, let's take a look on each of them more closer.