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Part 4 · Module 6

Behavioral patterns: communication

Decouple senders from receivers and coordinate interactions between cooperating classes: observer, mediator, chain of responsibility, and command with undo.

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0 of 4 lessons60 min

6.1ObserverUp next15m

Behavioral patterns: communication · designlab

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The path

Part 4 · Module 6

Behavioral patterns: communication

Decouple senders from receivers and coordinate interactions between cooperating classes: observer, mediator, chain of responsibility, and command with undo.

Start

0 of 4 lessons60 min

6.1ObserverUp next15m

6.2

Mediator

15m

6.3Chain of Responsibility15m

6.4Command15m

LabThe Real-Time Event & Command SystemFinish “The Resilient Data Pipeline” first40m

Practice what this module teaches

In-process Event Bus LLDDefine subscription, dispatch and error semantics for a reusable event dispatcher.Intermediate40 min Undo/Redo Editor LLDModel reversible commands, history branches and atomic grouped edits.Intermediate40 min Logging Framework LLDCompose structured logging, redaction and bounded asynchronous output.Intermediate40 min HTTP Router LLDMatch methods and path segments with deterministic precedence and safe decoding.Intermediate40 min

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