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import { ActivationContext } from "./ActivationContext";
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import { ValueDescriptor } from "./ValueDescriptor";
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import { ActivationError } from "./ActivationError";
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import { ServiceMap, Descriptor, PartialServiceMap, ServiceLocator, ContainerServiceMap, ContainerKeys, TypeOfService } from "./interfaces";
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import { TraceSource } from "../log/TraceSource";
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import { Configuration, RegistrationMap } from "./Configuration";
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import { Cancellation } from "../Cancellation";
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import { MapOf, IDestroyable } from "../interfaces";
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import { isDescriptor } from "./traits";
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import { LifetimeManager } from "./LifetimeManager";
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import { each } from "../safe";
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import { FluentRegistrations } from "./fluent/interfaces";
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import { FluentConfiguration } from "./fluent/FluentConfiguration";
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const trace = TraceSource.get("@implab/core/di/ActivationContext");
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export class Container<S extends object = any> implements ServiceLocator<S>, IDestroyable {
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readonly _services: ContainerServiceMap<S>;
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readonly _lifetimeManager: LifetimeManager;
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readonly _cleanup: (() => void)[];
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readonly _root: Container<S>;
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readonly _parent?: Container<S>;
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_disposed: boolean;
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constructor(parent?: Container<S>) {
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this._parent = parent;
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this._services = parent ? Object.create(parent._services) : {};
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this._cleanup = [];
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this._root = parent ? parent.getRootContainer() : this;
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this._services.container = new ValueDescriptor(this) as any;
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this._disposed = false;
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this._lifetimeManager = new LifetimeManager();
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}
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getRootContainer() {
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return this._root;
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}
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getParent() {
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return this._parent;
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}
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getLifetimeManager() {
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return this._lifetimeManager;
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}
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resolve<K extends ContainerKeys<S>>(name: K, def?: TypeOfService<S, K>): TypeOfService<S, K> {
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trace.debug("resolve {0}", name);
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const d = this._services[name];
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if (d === undefined) {
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if (def !== undefined)
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return def;
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else
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throw new Error("Service '" + name + "' isn't found");
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} else {
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const context = new ActivationContext<S>(this, this._services, String(name), d);
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try {
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return d.activate(context);
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} catch (error) {
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throw new ActivationError(name.toString(), context.getStack(), error);
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}
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}
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}
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/**
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* @deprecated use resolve() method
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*/
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getService<K extends ContainerKeys<S>>(name: K, def?: TypeOfService<S, K>) {
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return this.resolve(name, def);
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}
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register<K extends keyof S>(name: K, service: Descriptor<S, S[K]>): this;
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register(services: PartialServiceMap<S>): this;
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register<K extends keyof S>(nameOrCollection: K | ServiceMap<S>, service?: Descriptor<S, S[K]>) {
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if (arguments.length === 1) {
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const data = nameOrCollection as ServiceMap<S>;
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each(data, (v, k) => this.register(k, v));
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} else {
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if (!isDescriptor(service))
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throw new Error("The service parameter must be a descriptor");
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this._services[nameOrCollection as K] = service as any;
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}
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return this;
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}
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onDispose(callback: () => void) {
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if (!(callback instanceof Function))
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throw new Error("The callback must be a function");
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this._cleanup.push(callback);
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}
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destroy() {
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return this.dispose();
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}
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dispose() {
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if (this._disposed)
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return;
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this._disposed = true;
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for (const f of this._cleanup)
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f();
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}
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/**
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* @param{String|Object} config
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* The configuration of the contaier. Can be either a string or an object,
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* if the configuration is an object it's treated as a collection of
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* services which will be registed in the contaier.
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*
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* @param{Function} opts.contextRequire
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* The function which will be used to load a configuration or types for services.
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*
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*/
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async configure(config: string | RegistrationMap<S>, opts?: any, ct = Cancellation.none) {
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const c = new Configuration<S>(this);
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if (typeof (config) === "string") {
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return c.loadConfiguration(config, opts && opts.contextRequire, ct);
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} else {
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return c.applyConfiguration(config, opts && opts.contextRequire, ct);
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}
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}
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async fluent<K extends keyof S>(config: FluentRegistrations<K, S>, ct = Cancellation.none): Promise<this> {
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await new FluentConfiguration<S>().register(config).apply(this, ct);
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return this;
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}
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createChildContainer<S2 extends object = S>(): Container<S & S2> {
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return new Container<S & S2>(this as any);
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}
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}
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