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import { IActivationContext, IDestroyable, ILifetime } from "./interfaces";
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import { ActivationContext } from "./ActivationContext";
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import { argumentNotNull, isDestroyable } from "./traits";
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const 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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const emptyLifetime = Object.freeze({
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has() {
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return false;
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},
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initialize() {
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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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store() {
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// does nothing
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},
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toString() {
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return `[object EmptyLifetime]`;
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}
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});
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const unknownLifetime = Object.freeze({
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has() {
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return false;
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},
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initialize() {
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throw new Error("Can't call initialize on the unknown lifetime object");
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},
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get() {
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throw new Error("The lifetime object isn't initialized");
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},
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store() {
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throw new Error("Can't store a value in the unknown lifetime object");
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},
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toString() {
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return `[object UnknownLifetime]`;
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}
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});
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let nextId = 0;
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const singletons: { [K:string]: unknown} = {};
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export class LifetimeManager implements IDestroyable {
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private _cleanup: (() => void)[] = [];
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private readonly _cache: {[K: string]: unknown} = {};
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private _destroyed = false;
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private readonly _pending: {[K: string]: unknown} = {};
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create<T>(): ILifetime<T> {
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const id = ++nextId;
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return {
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has: () => id in this._cache,
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get: () => {
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const t = this._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 as T;
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},
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initialize: () => {
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if (this._pending[id])
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throw Error(`Cyclic reference detected: the item with the key ${id} is already activating.`);
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this._pending[id] = true;
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},
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store: (item: T, cleanup?: (item: T) => void) => {
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argumentNotNull(id, "id");
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argumentNotNull(item, "item");
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if (id in this._cache)
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throw new Error(`The item with with the key ${id} already registered with this lifetime manager`);
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delete this._pending[id];
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this._cache[id] = item;
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if (this._destroyed)
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throw new Error("Lifetime manager is destroyed");
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if (cleanup) {
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this._cleanup.push(() => cleanup(item));
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} else if (isDestroyable(item)) {
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this._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 empty<T>(): ILifetime<T> {
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return emptyLifetime;
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}
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static hierarchyLifetime<T>() {
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let _lifetime: ILifetime<T> = unknownLifetime;
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return {
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initialize(context: IActivationContext<object>) {
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if (_lifetime !== unknownLifetime)
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throw new Error("Cyclic reference activation detected");
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_lifetime = context.createContainerLifetime<T>();
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},
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get() {
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return _lifetime.get();
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},
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has() {
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return _lifetime.has();
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},
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store(item: T, cleanup?: (item: T) => void) {
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return _lifetime.store(item, cleanup);
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},
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toString() {
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return `[object HierarchyLifetime, has=${String(this.has())}]`;
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}
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};
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}
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static contextLifetime<T>() {
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let _lifetime: ILifetime<T> = unknownLifetime;
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return {
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initialize(context: ActivationContext<object>) {
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if (_lifetime !== unknownLifetime)
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throw new Error("Cyclic reference detected");
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_lifetime = context.createLifetime();
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},
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get() {
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return _lifetime.get();
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},
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has() {
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return _lifetime.has();
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},
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store(item: T) {
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_lifetime.store(item);
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},
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toString() {
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return `[object ContextLifetime, has=${String(this.has())}]`;
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}
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};
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}
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static singletonLifetime<T>(typeId: string) {
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argumentNotNull(typeId, "typeId");
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let pending = false;
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return {
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has() {
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return typeId in singletons;
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},
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get() {
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if (!this.has())
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throw new Error(`The instance ${typeId} doesn't exists`);
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return singletons[typeId] as T;
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},
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initialize() {
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if (pending)
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throw new Error("Cyclic reference detected");
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pending = true;
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},
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store(item: T) {
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singletons[typeId] = item;
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pending = false;
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},
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toString() {
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return `[object SingletonLifetime, has=${String(this.has())}, typeId=${typeId}]`;
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}
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};
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}
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static containerLifetime<T>(container: { createLifetime<X>(): ILifetime<X>}) {
|
|
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let _lifetime: ILifetime<T> = unknownLifetime;
|
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return {
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initialize() {
|
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if (_lifetime !== unknownLifetime)
|
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throw new Error("Cyclic reference detected");
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_lifetime = container.createLifetime();
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},
|
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get() {
|
|
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return _lifetime.get();
|
|
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},
|
|
|
has() {
|
|
|
return _lifetime.has();
|
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},
|
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store(item: T) {
|
|
|
_lifetime.store(item);
|
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},
|
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|
toString() {
|
|
|
return `[object ContainerLifetime, has=${String(_lifetime.has())}]`;
|
|
|
}
|
|
|
};
|
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}
|
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}
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