Pattern Examples

Real-world patterns and complete examples to learn from.

Each pattern demonstrates a different aspect of EventMachine:

Pattern	Demonstrates
Traffic Light	Custom context classes, typed behaviors, validation guards
Order Processing	Multi-step workflows, hierarchical states, result behaviors
Calculator	Event payloads, state machine operations, context updates
Elevator	Complex state logic, queued events, multi-path transitions
Guarded Transitions	Guard patterns, multi-branch transitions, conditional logic

How to Use These Examples

1. Start with Traffic Light - Simple example showing all core concepts
2. Move to Order Processing - Real business workflow pattern
3. Study Guarded Transitions - Understand conditional flow control
4. Explore Calculator & Elevator - More complex state logic

Pattern Structure

Each pattern includes:

• Overview - What the pattern demonstrates
• State diagram - Visual representation
• Full code - Complete, runnable implementation
• Usage examples - How to use the machine
• Tests - How to test the pattern
• Key concepts - What you learned

Creating Your Own Patterns

Use these patterns as templates:

// 1. Define your context
class MyContext extends ContextManager { ... }

// 2. Define events, guards, actions
class MyEvent extends EventBehavior { ... }
class MyGuard extends GuardBehavior { ... }
class MyAction extends ActionBehavior { ... }

// 3. Build the machine
class MyMachine extends Machine
{
    public static function definition(): MachineDefinition
    {
        return MachineDefinition::define(
            config: [...],
            behavior: [...],
        );
    }
}