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import { IDestroyable, MapOf } from "../interfaces";
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import { argumentNotNull, isDestroyable } from "../safe";
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import { ILifetimeManager, ILifetime } from "./interfaces";
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import { ActivationContext } from "./ActivationContext";
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function safeCall(item: () => void) {
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try {
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item();
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} catch {
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// silence
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}
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}
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export class LifetimeManager implements IDestroyable, ILifetimeManager {
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private _cleanup: (() => void)[] = [];
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private _cache: MapOf<any> = {};
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private _destroyed = false;
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initialize(id: string, context: ActivationContext<any>): ILifetime {
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const self = this;
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let pending = false;
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return {
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has() {
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return (id in self._cache);
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},
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get() {
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const t = self._cache[id];
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if (t === undefined)
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throw new Error(`The item with with the key ${id} isn't found`);
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return t;
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},
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enter() {
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if (pending)
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throw Error(`Cyclic reference detected: the item with the key ${id} is already activating.`);
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pending = true;
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},
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store(item: any, cleanup?: (item: any) => void) {
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argumentNotNull(id, "id");
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argumentNotNull(item, "item");
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if (this.has())
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throw new Error(`The item with with the key ${id} already registered with this lifetime manager`);
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pending = false;
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self._cache[id] = item;
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if (self._destroyed)
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throw new Error("Lifetime manager is destroyed");
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if (cleanup) {
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self._cleanup.push(() => cleanup(item));
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} else if (isDestroyable(item)) {
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self._cleanup.push(() => item.destroy());
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}
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}
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};
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}
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destroy() {
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if (!this._destroyed) {
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this._destroyed = true;
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this._cleanup.forEach(safeCall);
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this._cleanup.length = 0;
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}
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}
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static readonly empty: ILifetimeManager = {
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has() {
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return false;
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},
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get() {
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throw new Error("The specified item isn't registered with this lifetime manager");
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},
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register() {
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// does nothing
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},
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destroy() {
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throw new Error("Trying to destroy empty lifetime manager, this is a bug.");
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}
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};
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}
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