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Programming Concepts Advanced

What is Event-Driven Architecture?

A software design pattern where components communicate by producing and consuming events rather than direct method calls.

Event-driven architecture decouples system components by having producers emit events (facts about what happened) and consumers react to events of interest. This enables loose coupling, independent scaling, and asynchronous processing. Events are typically distributed through message brokers (Kafka, RabbitMQ, AWS SNS/SQS). Patterns include event notification (lightweight signals), event-carried state transfer (events include full data), and event sourcing (storing all state changes as an immutable event log). CQRS (Command Query Responsibility Segregation) often accompanies event-driven systems, separating read and write models.

Related Terms

Closure
A function that captures and retains access to variables from its enclosing scope, even after that scope has finished executing.
Recursion
A programming technique where a function calls itself to solve a problem by breaking it into smaller subproblems.
Refactoring
Restructuring existing code without changing its external behavior to improve readability, maintainability, and performance.
SOLID Principles
Five design principles for writing maintainable, flexible object-oriented code: Single Responsibility, Open-Closed, Liskov Substitution, Interface Segregation, and Dependency Inversion.
Technical Debt
The implied cost of additional rework caused by choosing a quick solution now instead of a better approach that would take longer.
Stack vs Heap
Two memory regions: the stack stores function call data with automatic cleanup, while the heap stores dynamically allocated objects.
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