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import { TraceSource } from "../log/TraceSource";
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import { argumentNotEmptyString } from "../safe";
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import { Descriptor, ContainerServiceMap, ContainerKeys, TypeOfService, ILifetime, ServiceContainer } from "./interfaces";
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import { MapOf } from "../interfaces";
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const trace = TraceSource.get("@implab/core/di/ActivationContext");
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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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_cache: MapOf<any>;
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_services: ContainerServiceMap<S>;
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_visited: MapOf<any>;
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_name: string;
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_service: Descriptor<S, any>;
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_container: ServiceContainer<S>;
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_parent: ActivationContext<S> | undefined;
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/** Creates a new activation context with the specified parameters.
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* @param container 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(container: ServiceContainer<S>, services: ContainerServiceMap<S>, name: string, service: Descriptor<S, any>) {
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this._name = name;
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this._service = service;
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this._visited = {};
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this._cache = {};
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this._services = services;
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this._container = container;
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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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/** Returns the container for which 'resolve' method was called */
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getContainer() {
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return this._container;
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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 ContainerKeys<S>>(name: K): TypeOfService<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 ContainerKeys<S>, T>(name: K, def: T): TypeOfService<S, K> | T;
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/** Resolves the specified dependency and returns undefined in case if the
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* dependency is missing.
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*
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* @param name The name of the dependency being resolved
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*/
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resolve<K extends ContainerKeys<S>>(name: K, def: undefined): TypeOfService<S, K> | undefined;
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resolve<K extends ContainerKeys<S>, T>(name: K, def?: T): TypeOfService<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 ${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 keyof S>(name: K, service: Descriptor<S, S[K]>) {
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argumentNotEmptyString(name, "name");
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this._services[name] = service as any;
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}
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createLifetime(): ILifetime {
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const id = nextId++;
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const me = this;
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return {
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initialize() {
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},
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has() {
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return id in me._cache;
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},
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get() {
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return me._cache[id];
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},
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store(item: any) {
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me._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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if (trace.isLogEnabled())
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trace.log(`enter ${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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visit(id: string) {
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const count = this._visited[id] || 0;
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this._visited[id] = count + 1;
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return count;
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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, any>, name: string): this {
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const clone = Object.create(this);
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clone._name = name;
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clone._services = Object.create(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);
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clone._services = Object.create(this._services);
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return clone;
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}
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}
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