LifetimeManager.ts
70 lines
| 1.9 KiB
| video/mp2t
|
TypeScriptLexer
cin
|
r129 | import { IDestroyable, MapOf } from "../interfaces"; | ||
| import { argumentNotNull, isDestroyable } from "../safe"; | ||||
| import { ILifetimeManager } from "./interfaces"; | ||||
| function safeCall(item: () => void) { | ||||
| try { | ||||
| item(); | ||||
| } catch { | ||||
| // silence | ||||
| } | ||||
| } | ||||
| export class LifetimeManager implements IDestroyable, ILifetimeManager { | ||||
| private _cleanup: (() => void)[] = []; | ||||
| private _cache: MapOf<any> = {}; | ||||
| private _destroyed = false; | ||||
| has(id: string) { | ||||
| return id in this._cache; | ||||
| } | ||||
| get(id: string) { | ||||
| const t = this._cache[id]; | ||||
| if (t === undefined) | ||||
| throw new Error(`The item with with the key ${id} isn't found`); | ||||
| return t; | ||||
| } | ||||
| register(id: string, item: any, cleanup?: (item: any) => void) { | ||||
| argumentNotNull(id, "id"); | ||||
| argumentNotNull(item, "item"); | ||||
| if (this.has(id)) | ||||
| throw new Error(`The item with with the key ${id} already registered with this lifetime manager`); | ||||
| this._cache[id] = item; | ||||
| if (this._destroyed) | ||||
| throw new Error("Lifetime manager is destroyed"); | ||||
| if (cleanup) { | ||||
| this._cleanup.push(() => cleanup(item)); | ||||
| } else if (isDestroyable(item)) { | ||||
| this._cleanup.push(() => item.destroy()); | ||||
| } | ||||
| } | ||||
| destroy() { | ||||
| if (!this._destroyed) { | ||||
| this._destroyed = true; | ||||
| this._cleanup.forEach(safeCall); | ||||
| this._cleanup.length = 0; | ||||
| } | ||||
| } | ||||
| static readonly empty: ILifetimeManager = { | ||||
| has() { | ||||
| return false; | ||||
| }, | ||||
| get() { | ||||
| throw new Error("The specified item isn't registered with this lifetime manager"); | ||||
| }, | ||||
| register() { | ||||
| // does nothing | ||||
| }, | ||||
| destroy() { | ||||
| throw new Error("Trying to destroy empty lifetime manager, this is a bug."); | ||||
| } | ||||
| }; | ||||
| } | ||||