Mellanlagret

Mellanlagret is a Swedish term used to describe an intermediary layer that sits between two adjacent layers or stages. In information technology and software architecture, mellanlagret commonly refers to the middle layer that encapsulates business logic, coordinates data access, and provides services to presentation layers. It is often called the application layer or service layer in other terminologies. The mellanlagret aims to decouple user interfaces from data storage, enabling modular design, easier testing, and improved scalability. Implementations typically include API services, middleware, or microservices, which expose well-defined interfaces while hiding details of data access and persistence. Patterns associated with the mellanlagret include orchestration, domain logic separation, and transaction management.

In data processing and integration contexts, mellanlagret can denote an intermediate storage or buffering stage, such as a queue, cache, or transformation step, that smooths differences in throughput and reliability between producers and consumers. This use supports decoupling and fault tolerance in distributed systems.

The term is also used in other disciplines, such as materials science and geoscience, to describe a physical intermediate layer that lies between two materials or geological strata, influencing adhesion, diffusion, or overall performance of the composite structure.

Origin and usage: mellanlagret is formed from mellan (between) and lagret (the layer or storage). See also: 3-tier architecture, middleware, service layer, caching, and intermediate storage.