Behavioral Patterns

Rolling Deployment

Rolling deployment is a software deployment strategy where new versions of an application are released to a subset of users or servers at a time, rather than all at once. This approach minimizes downtime and reduces the risk of widespread issues by allowing for gradual rollout and monitoring. If problems are detected, …

Splitter

behavioral processing

The Splitter pattern addresses the need to divide a larger data chunk (often a string) into smaller, manageable pieces based on a defined delimiter or strategy. It decouples the splitting logic from the code that consumes the split data, enabling flexibility and maintainability when splitting rules evolve or differ …

Event-Carried State Transfer

behavioral integration DDD

The Event-Carried State Transfer pattern focuses on transferring state between components using events. Instead of directly exposing and modifying an object’s state, a component publishes an event that contains a complete snapshot of the state to be transferred as a Value Object (or Transfer Object). Another …

Durable Subscriber

behavioral message-queue

The Durable Subscriber pattern addresses the reliability of message consumption in messaging systems. It ensures that a subscriber receives all messages published to a topic, even if the subscriber is temporarily offline or disconnects. This is achieved by persistently storing messages intended for the subscriber …

Read Model

CQRS behavioral data

The Read Model pattern addresses the performance challenges of querying complex domains by maintaining one or more specialized data stores optimized for specific read operations. Instead of directly querying the primary data store (often an event store or normalized database used by the write side), the read model …

Expand-Contract

behavioral DDD

The Expand-Contract pattern addresses scenarios where an object’s behavior needs to be dynamically altered by adding or removing components. It’s particularly useful when dealing with complex functionality that isn’t always required, promoting a lean initial state and deferring the instantiation of …

Conformist

behavioral integration

The Conformist pattern focuses on integrating with a pre-existing system or interface, even if that interface is poorly designed or doesn’t fully meet the needs of the integrating component. It prioritizes compatibility and “fitting in” over ideal design principles, often acting as a wrapper or translator to …

Thread Pool

concurrency behavioral

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 …

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 …