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import { Descriptor, ILifetime, RegistrationMap, LifetimeContainer, ConfigurableKeys } from "./interfaces";
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import { argumentNotNull } from "./traits";
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export interface ActivationContextInfo {
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name: string;
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service: string;
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}
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let nextId = 1;
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/** This class is created once per `Container.resolve` method call and used to
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* cache dependencies and to track created instances. The activation context
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* tracks services with `context` activation type.
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*/
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export class ActivationContext<S extends object> {
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private _cache: { [K: string]: unknown };
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private _services: Partial<RegistrationMap<S>>;
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private _name: string;
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private _service: Descriptor<S, unknown>;
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private readonly _containerLifetimeManager: LifetimeContainer;
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private _parent: ActivationContext<S> | undefined;
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/** Creates a new activation context with the specified parameters.
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* @param containerLifetimeManager the container which starts the activation process
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* @param services the initial service registrations
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* @param name the name of the service being activated, this parameter is
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* used for the debug purpose.
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* @param service the service to activate, this parameter is used for the
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* debug purpose.
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*/
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constructor(containerLifetimeManager: LifetimeContainer, services: Partial<RegistrationMap<S>>, name: string, service: Descriptor<S, unknown>) {
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this._name = name;
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this._service = service;
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this._cache = {};
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this._services = services;
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this._containerLifetimeManager = containerLifetimeManager;
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}
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/** the name of the current resolving dependency */
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getName() {
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return this._name;
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}
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createContainerLifetime<T>() {
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return this._containerLifetimeManager.createLifetime<T>();
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}
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/** Resolves the specified dependency in the current context
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* @param name The name of the dependency being resolved
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*/
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resolve<K extends keyof S>(name: K): NonNullable<S[K]>;
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/** Resolves the specified dependency with the specified default value if
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* the dependency is missing.
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*
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* @param name The name of the dependency being resolved
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* @param def A default value to return in case of the specified dependency
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* is missing.
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*/
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resolve<K extends keyof S, T>(name: K, def: T): NonNullable<S[K]> | T;
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resolve<K extends keyof S, T>(name: K, def?: T): S[K] | T | undefined {
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const d = this._services[name];
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if (d !== undefined) {
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return this.activate(d, name.toString());
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} else {
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if (arguments.length > 1)
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return def;
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else
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throw new Error(`Service ${String(name)} not found`);
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}
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}
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/**
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* registers services local to the the activation context
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*
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* @name{string} the name of the service
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* @service{string} the service descriptor to register
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*/
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register<K extends ConfigurableKeys<S>>(name: K, service: RegistrationMap<S>[K]) {
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argumentNotNull(name, "name");
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this._services[name] = service;
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}
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createLifetime<T>(): ILifetime<T> {
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const id = nextId++;
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return {
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initialize() {},
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has: () => id in this._cache,
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get: () => this._cache[id] as T,
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store: item => {
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this._cache[id] = item;
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}
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};
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}
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activate<T>(d: Descriptor<S, T>, name: string) {
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// TODO: add logging
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// if (trace.isLogEnabled())
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// trace.log("enter {0} {1}", name, d);
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const ctx = this.enter(d, name);
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const v = d.activate(ctx);
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// if (trace.isLogEnabled())
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// trace.log(`leave ${name}`);
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return v;
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}
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getStack(): ActivationContextInfo[] {
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const stack = [{
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name: this._name,
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service: this._service.toString()
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}];
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return this._parent ?
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stack.concat(this._parent.getStack()) :
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stack;
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}
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private enter(service: Descriptor<S, unknown>, name: string): this {
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const clone = Object.create(this) as this;
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clone._name = name;
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clone._services = Object.create(this._services) as typeof this._services;
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clone._parent = this;
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clone._service = service;
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return clone;
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}
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/** Creates a clone for the current context, used to protect it from modifications */
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clone(): this {
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const clone = Object.create(this) as this;
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clone._services = Object.create(this._services) as typeof this._services;
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return clone;
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}
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}
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