Reactive Microservices

  1. Core Concepts of Reactive Microservices
    1. Asynchronous, Non-Blocking Communication
      1. Understanding Blocking vs. Non-Blocking I/O
        1. Synchronous I/O Characteristics
          1. Asynchronous I/O Characteristics
            1. Thread Management
              1. Resource Efficiency
              2. The Role of Futures, Promises, and Observables
                1. Futures
                  1. Future Composition
                    1. Error Handling in Futures
                    2. Promises
                      1. Promise Resolution
                        1. Promise Chaining
                        2. Observables
                          1. Observable Streams
                            1. Reactive Extensions
                            2. Use Cases and Trade-offs
                            3. Event Loops and Concurrency Models
                              1. Event Loop Architecture
                                1. Thread Pools
                                  1. Reactive Concurrency Patterns
                                    1. Single-Threaded Event Loops
                                  2. Message-Driven Architecture
                                    1. Events vs. Commands vs. Queries
                                      1. Event Definition and Usage
                                        1. Event Immutability
                                          1. Event Ordering
                                          2. Command Definition and Usage
                                            1. Command Validation
                                              1. Command Processing
                                              2. Query Definition and Usage
                                                1. Query Optimization
                                                  1. Read Models
                                                2. Message Brokers and Queues
                                                  1. Role of Message Brokers
                                                    1. Message Queuing Mechanisms
                                                      1. Delivery Guarantees
                                                        1. At-Most-Once Delivery
                                                          1. At-Least-Once Delivery
                                                            1. Exactly-Once Delivery
                                                            2. Message Durability
                                                            3. Point-to-Point vs. Publish-Subscribe Models
                                                              1. Point-to-Point Messaging
                                                                1. Queue-Based Communication
                                                                  1. Message Consumption
                                                                  2. Publish-Subscribe Messaging
                                                                    1. Topic-Based Communication
                                                                      1. Subscriber Management
                                                                      2. Use Cases and Limitations
                                                                    2. Resilience and Fault Tolerance
                                                                      1. Failure Isolation
                                                                        1. Service Boundaries
                                                                          1. Bulkheading
                                                                            1. Resource Partitioning
                                                                            2. Graceful Degradation
                                                                              1. Fallback Mechanisms
                                                                                1. Service Downgrade Strategies
                                                                                  1. Partial Functionality
                                                                                  2. Self-Healing Mechanisms
                                                                                    1. Automatic Recovery
                                                                                      1. Health Checks and Monitoring
                                                                                        1. Circuit Recovery
                                                                                      2. Elasticity and Scalability
                                                                                        1. Horizontal vs. Vertical Scaling
                                                                                          1. Horizontal Scaling Concepts
                                                                                            1. Vertical Scaling Concepts
                                                                                              1. When to Use Each Approach
                                                                                                1. Cost Considerations
                                                                                                2. Dynamic Load Balancing
                                                                                                  1. Load Balancer Types
                                                                                                    1. Traffic Distribution Strategies
                                                                                                      1. Health-Based Routing
                                                                                                      2. Autoscaling Strategies
                                                                                                        1. Metrics for Autoscaling
                                                                                                          1. Policy-Based Scaling
                                                                                                            1. Reactive Autoscaling
                                                                                                              1. Predictive Scaling
                                                                                                            2. Responsiveness
                                                                                                              1. Latency and Throughput
                                                                                                                1. Measuring Latency
                                                                                                                  1. Measuring Throughput
                                                                                                                    1. Impact on User Experience
                                                                                                                      1. Performance Optimization
                                                                                                                      2. Providing Timely Feedback
                                                                                                                        1. User Notifications
                                                                                                                          1. Progress Indicators
                                                                                                                            1. Acknowledgment Patterns
                                                                                                                            2. User Experience Implications
                                                                                                                              1. Perceived Performance
                                                                                                                                1. Error Handling and User Communication
                                                                                                                                  1. Progressive Loading

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                                                                                                                              1. Foundations of Reactive Systems

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                                                                                                                              3. Architectural Patterns and Design