Invoker: meaning, definitions and examples

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invoker

[ɪnˈvoʊkər ]

Definition

^{Context #1 | Noun}

programming term

An invoker is a component that calls or triggers a function or method in a programming context. It is often used in relation to design patterns, such as the Command pattern, where the invoker object holds a reference to the command and calls its execute method.

Synonyms

caller, executor, trigger.

Examples of usage

The invoker is responsible for triggering commands.
In the command pattern, the invoker knows how to execute commands.
The event handler acts as an invoker for UI actions.

Interesting Facts

Etymology

The word 'invoke' comes from the Latin 'invocare', meaning 'to call upon' or 'to summon'.
It was first recorded in English around the late 14th century, used in religious and legal contexts.
The suffix '-er' indicates a person performing an action, thus making 'invoker' a term for someone who invokes.

Literature

In fantasy literature, an invoker often calls upon magical beings or forces, reflecting themes of power and control.
Famous works such as 'The Necronomicon' portray invokers as characters who dare to summon cosmic entities, showcasing the risks involved.
In many stories, invokers must use specific rituals or chants, adding an element of mystery and danger.

Technology

In computer programming, an invoker refers to the code or method that calls a function, illustrating its pivotal role in executing actions.
Software frameworks often use invokers to manage commands, allowing for modular and efficient programming.
APIs (Application Programming Interfaces) include invokers that facilitate communication between different software applications.

Psychology

The concept of an invoker parallels the psychological notion of 'suggestion', where people call upon their inner thoughts to manifest changes.
Therapeutic practices may employ invocative language to help clients visualize outcomes and frame their desires powerfully.
Ritualistic practices often involve invocation as a means to engage one's subconscious and create mental space for transformation.

Pop Culture

In video games, invokers are often characters with abilities to summon creatures or cast powerful spells, enhancing gameplay dynamics.
The 'Invoker' character in 'Dota 2' is known for being complex and requires strategy, reflecting the deeper meaning of invoking and controlling spells.
Movies about witches and sorcerers frequently feature invokers who summon spirits, showcasing their connection to ancient fears and fascination.