Oct 14, 2021

Business Logic Layer

A Business Logical Layer (BLL) functions as an intermediary between a presentation layer and a Data Access Layer (DAL) in programming. In the Business Logic Layer, business rules, calculations, and logic are controlled by the application so that it behaves as expected. Therefore, the BLL is responsible for determining how data is used from the database and for governing what can and cannot be done within the application.

Understanding a Business Logic Layer

As a result, the Business Logic Layer manages the communications between a database and a user interface, which is sometimes referred to as the end user As a part of the multi-tier architecture of software engineering, various processes are physically separated from one another.

Separation typically involves functions assigned to one of three layers:

The User Interface Layer (UI) is where data is presented to the user and where all user interactions occur. Sending and receiving data is part of the user’s job. Layer of Business Logic (BLL) – as we have seen, BLL is in charge of application processing and coordinates the flow of data between the user interface and data access layers. It is the layer where data management takes place, also known as the Data Access Layer (DAL). The most common way to accomplish this is via a web service or a

Defining a Business Logic Layer

There is a lot of clarity on what constitutes the UI and DAL. However, we may be less clear on what constitutes the The result is that many businesses (including Apple and Microsoft) remove the BLL from their applications completely and have UI code communicate with the DAL directly. The result is a controller known colloquially as the Fat Controller. Domain logic serves too many requests from a controller with this description. This leads to controller logic that is too complex and In the end, this complexity makes code maintenance difficult. The best option is to design the program to support multiple different A common set of code is then added to each user interface as part of

Generally speaking, this code is any which deals with the following:

Data that is retained (in the database). UI display of data (for the user). Getting access to data (from Analyzing a problem and making a logical decision. The calculation is performed. Updating the state of an application. Working together as a team. The process of processing commands (from the GUI

In the proper application, the BLL centralizes as much common logic as possible and does not have to be tied to any one A user interface can be standardized for an application to support unlimited user interfaces. This minimizes instances of duplication of code. Moreover, it is necessary to keep in mind that when the BLL grows, the code in the UI layer must shrink according to its size. According to the “Thin Controller” theory, this is the core concept. By moving from a three-tier architecture to an n-tier architecture as the BLL grows and becomes bloated, the layer can be further separated.

Key takeaways:

As the intermediary between the Data Access Layer (DAL) and the User Interface Layer (UI), the Business Logic Layer facilitates data exchange between these two layers. Most businesses omit the Business Logic Layer in favor of the Application Layer due to its difficulty in defining. As a result of the DAL communicating directly with the UI, code becomes overly complex, and maintenance becomes a challenge. It allows developers to design applications that support multiple user interfaces by implementing Business Logic Layers. By reducing the number of duplicate lines of code, the number of duplications is minimized.

 

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