Module 5: Production Patterns

Battle-tested concurrency and design patterns for real-world Go services.

Topics

#	Topic	Source	Key Concepts
1	Functional Options	src/05_patterns/01_functional_options/main.go	Option funcs, builder alternative, defaults
2	Worker Pool Advanced	src/05_patterns/02_worker_pool_advanced/main.go	Dynamic scaling, graceful drain, metrics
3	Fan-In / Fan-Out	src/05_patterns/03_fan_in_fan_out/main.go	Merge channels, distribute work, collect results
4	Circuit Breaker	src/05_patterns/04_circuit_breaker/main.go	States, thresholds, half-open recovery
5	Retry with Backoff	src/05_patterns/05_retry_with_backoff/main.go	Exponential backoff, jitter, max attempts
6	Pub/Sub	src/05_patterns/06_pub_sub/main.go	Topics, subscribers, async dispatch

Run Any Example

go run src/05_patterns/01_functional_options/main.go

What You'll Learn

• Functional options for clean, extensible APIs
• Circuit breaker to prevent cascade failures
• Retry with exponential backoff + jitter for distributed systems
• Fan-in/fan-out for parallel data processing pipelines
• In-process pub/sub for decoupled components