Vertex Stream

1. Problem Statement

A collection of working components does not automatically form a dependable application. Events may arrive twice, appear out of order, or be interrupted before their processing finishes. Shared records can become inconsistent when several operations attempt related changes. Errors may be difficult to investigate when a workflow crosses multiple classes and worker tasks. These situations require careful design choices that can be explained, tested, and revised.

2. Solution

Vertex Stream organizes these concerns into six connected modules. Each module introduces one architectural responsibility and demonstrates it with Ruby code. Walkthroughs trace event movement, state changes, and recovery decisions across component boundaries. Practical activities ask learners to compare designs and document the reasoning behind their choices. A final workshop brings the material together in a small event-coordination system.

3. What's Inside

Module 1 — Mapping an Event Lifecycle

Define event identifiers, payload fields, timestamps, and processing states. Trace an event from intake through validation, routing, handling, and completion.

Module 2 — State Transitions and Workflow Rules

Represent workflow stages using Ruby objects and explicit transition methods. Study valid and invalid state changes, guard conditions, and their effects on application behavior.

Module 3 — Duplicate Events and Repeatable Operations

Explore event identifiers, duplicate detection, and idempotent handling. Examine why a repeated message should not always repeat a state change. Build sample handlers for repeated events.

Module 4 — Failures, Retries, and Recovery

Distinguish temporary processing failures from invalid messages. Design bounded retry rules, record error context, and route unresolved events to a separate review collection. Discuss the tradeoffs involved in restarting interrupted work.

Module 5 — Tests and Operational Records

Write tests for state transitions, repeated events, failed handlers, and unexpected ordering. Organize structured diagnostic records that describe what happened without exposing unrelated information.

Module 6 — Event Coordination Studio

Create a compact Ruby application that receives sample events, validates their structure, updates workflow state, and records processing outcomes. Add duplicate handling, recovery rules, and focused tests. Document the architecture and review how its components communicate.

4. Who Is This For?

Vertex Stream is intended for learners familiar with Ruby classes, modules, queues, threads, structured data, and introductory testing. It suits independent study of event architecture and the coordination of related operations.

5. What You'll Learn

• Model event lifecycles and workflow states.

• Define valid state transitions and guard conditions.

• Design handling rules for repeated events.

• Separate validation failures from processing interruptions.

• Organize retries, recovery records, and diagnostics.

• Test coordinated behavior across Ruby components.

• Document an event-processing architecture.

6. Guarantee

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