Business logic layer
Encyclopedia
A business logic layer (BLL), also known as the domain layer, is a software engineering
practice of compartmentalizing. The business logic layer is usually one of the tiers in a multitier architecture
. It separates the business logic
from other modules, such as the data access layer
(DAL) and user interface
(UI). By doing this, the business logic of an application can often withstand modifications or replacements of other tiers. For example, in an application with a properly separated business logic layer and data access layer, the data access layer could be rewritten to retrieve data from a different database, without affecting any of the business logic. This practice allows software application development to be more effectively split into teams, with each team working on a different tier simultaneously.
Within a BLL objects can further be partitioned into business processes (business activities) and business entities. Business process objects typically implement the controller pattern, i.e. they contain no data elements but have methods that orchestrate interaction among business entities. Business entities typically correspond to entities in the logical domain model, rather than the physical database model. Domain entities are a super-set of data layer entities or data transfer objects, and may aggregate zero or more Dies/DTOs.
Software engineering
Software Engineering is the application of a systematic, disciplined, quantifiable approach to the development, operation, and maintenance of software, and the study of these approaches; that is, the application of engineering to software...
practice of compartmentalizing. The business logic layer is usually one of the tiers in a multitier architecture
Multitier architecture
In software engineering, multi-tier architecture is a client–server architecture in which the presentation, the application processing, and the data management are logically separate processes. For example, an application that uses middleware to service data requests between a user and a database...
. It separates the business logic
Business logic
Business logic, or domain logic, is a non-technical term generally used to describe the functional algorithms that handle information exchange between a database and a user interface.- Scope of business logic :Business logic:...
from other modules, such as the data access layer
Data access layer
A data access layer is a layer of a computer program which provides simplified access to data stored in persistent storage of some kind, such as an entity-relational database....
(DAL) and user interface
User interface
The user interface, in the industrial design field of human–machine interaction, is the space where interaction between humans and machines occurs. The goal of interaction between a human and a machine at the user interface is effective operation and control of the machine, and feedback from the...
(UI). By doing this, the business logic of an application can often withstand modifications or replacements of other tiers. For example, in an application with a properly separated business logic layer and data access layer, the data access layer could be rewritten to retrieve data from a different database, without affecting any of the business logic. This practice allows software application development to be more effectively split into teams, with each team working on a different tier simultaneously.
Within a BLL objects can further be partitioned into business processes (business activities) and business entities. Business process objects typically implement the controller pattern, i.e. they contain no data elements but have methods that orchestrate interaction among business entities. Business entities typically correspond to entities in the logical domain model, rather than the physical database model. Domain entities are a super-set of data layer entities or data transfer objects, and may aggregate zero or more Dies/DTOs.
See also
- Business logicBusiness logicBusiness logic, or domain logic, is a non-technical term generally used to describe the functional algorithms that handle information exchange between a database and a user interface.- Scope of business logic :Business logic:...
- Common layers in an information system logical architectureCommon layers in an information system logical architectureThe following four layers are the most common layers in a logical multilayered architecture for an information system with an object-oriented design:* User Interface Layer...