Patterns

Thread Pool

The Thread Pool pattern manages a pool of worker threads to execute tasks concurrently. Instead of creating a new thread for each task, which is resource-intensive, tasks are submitted to a queue and picked up by available threads from the pool. Once a thread completes a task, it returns to the pool to await another …

Metrics & Alerts

observability monitoring operational

The Metrics & Alerts pattern is a fundamental aspect of operational monitoring and observability. It involves collecting data points (metrics) from a system over time, aggregating or processing them, and then triggering notifications (alerts) when those metrics cross predefined thresholds. This allows operators to …

Pipeline

behavioral functional

The Pipeline pattern is a processing pattern that breaks down a complex task into a series of independent processing stages connected in a sequence. Each stage takes the output of the previous stage as its input, performing a specific transformation or action. This promotes separation of concerns, making the system …

PAC

behavioral security

The Proxy pattern provides a surrogate or placeholder for another object to control access to it. This is particularly useful for sensitive or expensive-to-create resources. The proxy object has an interface identical to the real subject, but it doesn’t necessarily have the full functionality. Instead, it acts as …

Actor Model

concurrency behavioral DDD

The Actor Model is a concurrent computation model that treats “actors” as the fundamental units of computation. Actors encapsulate state and behavior, and communicate with each other exclusively through asynchronous message passing. This avoids the complexities of shared mutable state and locks, leading to …

Unit of Work

behavioral DDD

The Unit of Work pattern is a mechanism to manage a sequence of operations against a data store as a single logical unit. It encapsulates all changes made to persistent objects within a single transaction, ensuring that either all changes are applied successfully, or none are. This is crucial for maintaining data …

Ambassador

behavioral microservices distributed systems

The Ambassador pattern provides a single point of entry for a system (or set of backend services) while abstracting away the internal complexity. It acts as a forward-facing proxy that handles requests, potentially transforming them, adding security, and routing them to the appropriate backend. This decouples clients …

Lazy Load

behavioral performance

Lazy Load is a design pattern used in computer programming to delay the initialization of an object until the point at which it is first used. Instead of loading resources or creating objects upfront, the pattern postpones these operations to improve initial load times and conserve system resources. This is …

Value Object

DDD behavioral

A Value Object is an object that describes some characteristic of a Domain, but has no concept of identity. Instead of being defined by its unique position in memory (like an Entity), it is defined by the values it holds. Two Value Objects with the same values are considered equal, and are interchangeable. They are …

Abstract Factory

creational GOF

The Abstract Factory pattern is a creational design pattern that provides an interface for creating families of related or dependent objects without specifying their concrete classes. It allows a system to be independent of how its products are created, composed, and represented. Effectively, it’s a …