Abruffunktion

Abruffunktion is a function or mechanism in information systems that retrieves data or resources from a store upon request. It is activated by a trigger such as a user action, an event, or a programmatic call. In practice, abruffunktion is used to fetch a specific item identified by a key, query, or identifier, returning the requested data to the caller. The term is rooted in the German words abruf (retrieval) and Funktion (function). In some contexts it is written as Abruf-Funktion or abruf-Funktion.

Depending on architecture, abruffunktion can be synchronous (blocking) or asynchronous (returning a handle or future). It may operate over various layers, including databases, file systems, caches, or remote services, and can involve caching or pagination.

Examples include a database query triggered by a user request; a REST API endpoint that retrieves a resource; a web application that lazily loads content when a user scrolls; and a cloud key-value store fetch on demand. These usages illustrate the core idea of on-demand data access under controlled interfaces.

Design considerations for abruffunktion include latency and throughput requirements, data consistency, failure handling, and security concerns such as authorization and access control. Other factors are rate limits, idempotence, and caching strategies to balance freshness with performance. Related concepts include lazy loading, data fetching, on-demand retrieval, prefetching, and the distinction between synchronous and asynchronous calls.