Wiki

This section of my site presents a curated collection of self-authored articles on techniques and methodologies that I find particularly compelling or relevant.

For musings and general ideas, feel free to explore my articles and my blog.

📄️ Actor

An Actor is an entity that interacts with a system.

📄️ Aggregate

An Aggregate is an abstraction for an object that is important and of value to the business of its domain. It is often referred to as a "cluster" of objects, because it is modelled as a whole/parts-relationship holding between and .

📄️ Aggregation

An Aggregation is a form of an with extended notation to emphasize on whole/part-relationships.

📄️ Aliasing

Aliasing in Object-Oriented Programming is a synonym for two (or more) variables referencing the same instance.

📄️ Anemic Domain Model

An Anemic Domain Model is a domain model that contains little or no business logic, and whose mainly consists of getters and setters. Specification and invariants regarding the domain logic are controlled through layers and upstream components.

📄️ Antisymmetric Matrix

An Antisymmetric Matrix or Skew Symmetric Matrix is a matrix where its cross-diagonal entries are negated, that is

📄️ Application Layer

The Application Layer is an abstract functional division in a that serves as the interface between the client and layers beneath the Application Layer, primarily the software system's Domain and Infrastructure Layer.

📄️ Association

An Association between entities can be illustrated in UML with a solid line connecting the entities that are related.

📄️ Big Ball of Mud

A "Big Ball of Mud" is a historically grown software system (or a part of it) often characterized through lack of modularization, missing , redundant code and information leaking through various levels of abstractions.

📄️ BoundedContext

A Bounded Context is a part of a software system that contains the semantics of a

📄️ BSI-Standard 200-1

The BSI-Standard 200-1 of the provides guidance on how to establish an Information Security Management System (ISMS).

📄️ BSI-Standard 200-2

The BSI-Standard 200-2 provides a methodology for the effective implementation and management of information security.

📄️ BSI-Standard 200-3

The BSI-Standard 200-3 forms part of the and provides guidance for performing risk analysis in systems where high security risks may arise.

📄️ BSI IT-Grundschutz

The BSI IT-Grundschutz is a comprehensive methodology for implementing and managing information security management systems (ISMS).

📄️ BSI IT-Grundschutz Compendium

IT-Grundschutz Compendium

📄️ CIA Triad

CIA Triad is an umbrella term used in Information Security that refers to three core security objectives Confidentiality, Integrity, Availability.

📄️ Composition

A Composition is an and designates a special form of an . It is used in cases where the abstraction of a model requires a strong emphasis on the whole/part-relationship, approximately corresponding to denoting a parent/child-relationship of the elements within the Composition.

📄️ Constructors (Java)

Some authors treat the term default constructor equal to parameterless constructor.

📄️ Core Domain

In a software system, a Core Domain is the part of the software that holds all functionality innate to the

📄️ Culling

Culling describes the process of excluding various geometrical shapes from rendering based on their spatial relation to the camera's .

📄️ Dependency

A Dependency between a client (dependent) and a supplier (dependee) can be illustrated with a dashed line with its tail starting at the client and an open arrowhead ending at the supplier.

📄️ Dependency Injection

Dependency Injection (DI) is a design pattern that helps with decoupling dependencies.

📄️ Dependency-Inversion Principle

The Dependency Inversion Principle (DIP) is a principle in Agile Software Development that helps with

📄️ Domain

The term Domain in Software Design stands for a business which processes are implemented in a software system

📄️ Domain Driven Design

Domain Driven Design is a software development methodology that focuses on

📄️ Domain Layer

The Domain Layer is a layer in a and holds all implementation related to the business of the software, such as rules and concepts, manifesting in , expressed through a and bounded by .

📄️ Domain Model

A Domain Model is an abstraction of a (part of a) in a software system.

📄️ System Driver Types

User Space Driver

📄️ Entity

An Entity is a specification of a uniquely identifiable (abstract) object and its properties and behavior in a

📄️ Eventual Consistency

An Eventual Consistency is a consistency model that guarantees the consistent state of data.

📄️ Facade

A Facade is an object based Structural Pattern .

📄️ Factory Method

A Factory Method is a method for creating a new object for a given type.

📄️ First-Class Citizen

In programming, an entity is called First-Class Citizen if all of the following apply:

📄️ Higher-Order Function

In programming, a function is called a Higher-Order Function, if any of the following applies:

📄️ IPsec

IPsec (IP security) is a protocol suite for the network layer in the 5-layer internet model.

📄️ ISO/IEC 27001

The ISO/IEC 27001 is a standard for Information Security Management Systems (ISMS) and provides guidance for establishing, implementing, maintaining and improving an ISMS:

📄️ Keyword

A Keyword in UML is a predefined and reserved word available with the meta-model of UML.

📄️ λ Calculus

Lambda Calculus is a formal definition for expressing functional computational operations based on variable binding and substitution.

📄️ Layered Architecture

A Layered Architecture is a design paradigm for creating abstract divisions from related functionality in a software system.

📄️ Liskov Substitution Principle

The Liskov Substitution Principle (LSP) governs design rules for object oriented languages and states that "subtypes must be substitutable for their base types." :

📄️ Metaclass

A Metaclass in Object-oriented programming is a class whose instances contain class-definitions. Metaclasses can

📄️ Method Signature

A Method Signature identifies a method. It consists of the method's name and its formal parameter list.

📄️ Outer Product

Let $\boldsymbol$ and $\boldsymbol{B}$ be $n \times 1$-matrices.

📄️ Pure Function

A function is considered a Pure Function if

📄️ Referential Transparency

If an expression can be substituted for a value without changing the program's computational result, the expression is referential transparent.

📄️ Repository

A Repository provides an interface for persisting and retrieving data, while hiding the implementation details of

📄️ Separate Query From Modifier

Separate Query From Modifier is a refactoring that helps with creating side effect free functions.

📄️ Separation of Concerns

Separation of Concerns is a design principle in software development and can be considered fundamental for creating

📄️ Single Responsibility Principle

The Single Responsibility Principle (SRP) is a Software Design Principle that states that there should never be

📄️ Singleton

A Singleton is an object that uniquely exists for a class: Creating new instances of this class always restrict to this one object.

📄️ SOLID

SOLID is an acronym for five principles in Software Development and Software Design. They were introduced by

📄️ Spanning Tree

If $G$ is a connected graph, then the Spanning Tree $T \sube G$ is a minimal connected graph with $V(T) = V(G)$.

📄️ SSL/TLS

SSL (Secure Socket Layer, ) is a communication protocol providing confidentiality, authenticity and integrity in network communications.

📄️ Symptoms of Poor Design

The Symptoms of Poor Design are a collection of symptoms that appear in software systems where poor design choices - or none at all -

📄️ Table Data Gateway

A Table Data Gateway provides an interface to the table of a database.

📄️ Ubiquitous Language

A Ubiquitous Language is a vocabulary established by (software development) teams that provides semantic contexts

📄️ Use Case

A Use Case represents a description of a functionality or requirement of a software system.

📄️ Value Object

In Object-Oriented Programming, a Value Object is an abstraction of a value belonging to a particular domain.

📄️ View Frustum

A frustum is a geometric shape representing a truncated pyramid with a rectangular base.

📄️ X.509 Certificate

The X.509 Certificate is a standardised certificate format and is commonly used by Public Key Infrastructures (PKI) to ensure interoperability between systems.