Tom Boullay
105 lines
3.0 KiB
Markdown
105 lines
3.0 KiB
Markdown
# Skill — Singleton Managers
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## Pattern
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Every manager follows the exact same singleton structure:
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```ts
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export class SomeManager {
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private static _instance: SomeManager | null = null;
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static getInstance(): SomeManager {
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if (!SomeManager._instance) {
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SomeManager._instance = new SomeManager();
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}
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return SomeManager._instance;
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}
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private constructor() {
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// init logic
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}
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destroy(): void {
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// cleanup logic
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SomeManager._instance = null;
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}
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}
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```
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## Managers in this project
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| Manager | File | Role |
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| -------------------- | ------------------------------------ | ----------------------------------------------------------------------------- |
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| `AudioManager` | `src/managers/AudioManager.ts` | Music and SFX playback. |
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| `InteractionManager` | `src/managers/InteractionManager.ts` | Focus, nearby, trigger, grab, and hand-grab interaction state. |
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| `GameManager` | target-state only | Future single source of truth for phase, zone, mission, input lock, dialogue. |
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| `CinematicManager` | target-state only | Future GSAP timeline orchestrator. |
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| `ZoneManager` | target-state only | Future zone entry/exit detection and LOD triggers. |
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## GameManager is the orchestrator
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```ts
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export class GameManager {
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cinematic!: CinematicManager;
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audio!: AudioManager;
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zone!: ZoneManager;
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private constructor() {
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this.cinematic = CinematicManager.getInstance();
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this.audio = AudioManager.getInstance();
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this.zone = ZoneManager.getInstance();
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}
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}
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```
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Components and hooks access other managers **through GameManager only**:
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```ts
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// Correct
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GameManager.getInstance().cinematic.play("intro");
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// Wrong — never import sub-managers directly in components
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CinematicManager.getInstance().play("intro");
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```
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## Subscribe pattern (GameManager only)
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```ts
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private listeners = new Set<() => void>()
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subscribe(listener: () => void): () => void {
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this.listeners.add(listener)
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return () => this.listeners.delete(listener)
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}
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private emit(): void {
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this.listeners.forEach((cb) => cb())
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}
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```
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Every `set*()` method calls `this.emit()` to notify subscribers.
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## React bridge hook
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```ts
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// hooks/useGameState.ts
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export function useGameState() {
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const game = GameManager.getInstance();
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const [state, setState] = useState(game.getState());
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useEffect(() => {
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return game.subscribe(() => setState({ ...game.getState() }));
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}, [game]);
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return state;
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}
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```
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## Rules
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- Max 4 managers total
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- Only `GameManager` holds durable state with `subscribe()`
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- Other managers are side-effect handlers — they do not store persistent state
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- Always call `destroy()` on cleanup (App unmount)
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- Never create manager instances with `new` — always use `.getInstance()`
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