Patterns

View Helper

The View Helper pattern encapsulates complex presentation logic within reusable components, keeping the core View layer clean and focused on markup. It addresses the issue of “fat” views that contain significant procedural code for formatting and displaying data. By delegating these tasks to View Helpers, …

Write-Through Cache

behavioral performance

The Write-Through Cache pattern involves updating both the cache and the underlying data store simultaneously when a write operation occurs. Every write to the cache immediately propagates to the data store, ensuring data consistency. While this approach reduces read latency (data is often present in the cache) it can …

Application Service

behavioral DDD

The Application Service pattern defines a layer responsible for coordinating the execution of use cases within a domain-driven design (DDD) application. It acts as an intermediary between the presentation layer (UI, API) and the domain layer, encapsulating the application’s behavior and orchestrating domain …

Access Token

behavioral security

The Access Token pattern is a security mechanism that allows a client application to access protected resources on behalf of a user. Instead of the client directly managing user credentials (like usernames and passwords), it receives a temporary security credential – the access token – from an authorization server. …

Table Data Gateway

creational data access

The Table Data Gateway pattern provides an interface to a database table that encapsulates the table’s structure and ensures data consistency. It isolates the database-specific access logic from the rest of the application, making it easier to switch databases or modify the data access layer without impacting the core …

Reverse Proxy

structural infrastructure

The Reverse Proxy pattern involves a server that sits in front of one or more backend servers and intercepts client requests. Instead of clients connecting directly to backend servers, they connect to the reverse proxy, which then forwards the requests to the appropriate backend server. The reverse proxy then receives …

Layered Architecture

architectural structural

The Layered Architecture pattern organizes an application into distinct layers, each with a specific role and responsibility. Layers are arranged hierarchically, with each layer building upon the services provided by the layer below. This separation promotes modularity, maintainability, and testability by reducing …

Message Bus

behavioral integration system

The Message Bus pattern provides a loosely coupled architecture that facilitates communication between different components (services, modules, applications) within a system. It acts as a central intermediary, allowing publishers to send messages without knowing specifically who the subscribers are, and allowing …

Service Mesh

distributed systems infrastructure observability

A service mesh is a dedicated infrastructure layer for facilitating service-to-service communication within a microservices application. It manages concerns like service discovery, load balancing, encryption, observability, and traffic management, abstracting these complexities away from individual service code. The …

Policy

behavioral DDD

The Policy pattern encapsulates a set of business rules or logic into separate classes, allowing for greater flexibility and maintainability. It defines a family of algorithms (policies) and makes them interchangeable, enabling the selection of the appropriate algorithm at runtime based on context. Rather than …