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import { IDestroyable, MapOf } from "../interfaces";
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import { argumentNotNull, isDestroyable, argumentNotEmptyString, isRemovable } from "../safe";
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import { ILifetime, ServiceContainer } 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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const emptyLifetime: ILifetime = 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: ILifetime = 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: any = {};
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export class LifetimeManager implements IDestroyable {
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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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private _pending: MapOf<boolean> = {};
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create(): ILifetime {
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const self = this;
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const id = ++nextId;
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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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initialize() {
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if (self._pending[id])
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throw Error(`Cyclic reference detected: the item with the key ${id} is already activating.`);
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self._pending[id] = 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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delete self._pending[id];
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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 empty(): ILifetime {
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return emptyLifetime;
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}
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static hierarchyLifetime() {
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let _lifetime = unknownLifetime;
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return {
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initialize(context: ActivationContext<any>) {
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if (_lifetime !== unknownLifetime)
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throw new Error("Cyclic reference activation detected");
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_lifetime = context.getContainer().getLifetimeManager().create();
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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: any, cleanup?: (item: any) => 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=${this.has()}]`;
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}
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};
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}
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static contextLifetime() {
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let _lifetime = unknownLifetime;
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return {
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initialize(context: ActivationContext<any>) {
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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: any) {
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_lifetime.store(item);
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},
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toString() {
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return `[object ContextLifetime, has=${this.has()}]`;
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}
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};
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}
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static singletonLifetime(typeId: string) {
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argumentNotEmptyString(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 ${typeId} doesn't exists`);
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return singletons[typeId];
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},
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initialize() {
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if (pending)
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throw new Error("Cyclic reference detected");
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pending = true;
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},
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store(item: any) {
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singletons[typeId] = item;
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pending = false;
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},
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toString() {
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return `[object SingletonLifetime, has=${this.has()}, typeId=${typeId}]`;
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}
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};
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}
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static containerLifetime(container: ServiceContainer<any>) {
|
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let _lifetime = unknownLifetime;
|
|
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return {
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initialize(context: ActivationContext<any>) {
|
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if (_lifetime !== unknownLifetime)
|
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throw new Error("Cyclic reference detected");
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_lifetime = container.getLifetimeManager().create();
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},
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get() {
|
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return _lifetime.get();
|
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},
|
|
|
has() {
|
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return _lifetime.has();
|
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},
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store(item: any) {
|
|
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_lifetime.store(item);
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},
|
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|
toString() {
|
|
|
return `[object ContainerLifetime, has=${_lifetime.has()}]`;
|
|
|
}
|
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};
|
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}
|
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}
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