@visactor/vrender-core/es/registry/renderer-registry.js

```typescript import { xxx } from '@visactor/vrender-core'; ```

function isRendererFactory(entry) {
    return "function" == typeof entry;
}

export class RendererRegistry {
    constructor() {
        this.entries = new Map, this.cache = new Map;
    }
    register(key, renderer) {
        this.entries.set(key, renderer), this.cache.delete(key);
    }
    unregister(key) {
        this.entries.delete(key), this.cache.delete(key);
    }
    get(key) {
        if (this.cache.has(key)) return this.cache.get(key);
        const entry = this.entries.get(key);
        if (!entry) return;
        const renderer = isRendererFactory(entry) ? entry() : entry;
        return this.cache.set(key, renderer), renderer;
    }
    getAll() {
        return Array.from(this.entries.keys()).map((key => this.get(key))).filter((renderer => !!renderer));
    }
    clear() {
        this.entries.clear(), this.cache.clear();
    }
}
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