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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 { isDescriptor, ServiceMap, Descriptor, PartialServiceMap, ContainerServices, Resolver } from "./interfaces";
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import { TraceSource } from "../log/TraceSource";
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import { Configuration } from "./Configuration";
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import { Cancellation } from "../Cancellation";
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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 class Container<S = any> implements Resolver<S> {
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readonly _services: PartialServiceMap<S, ContainerServices<S>>;
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readonly _cache: MapOf<any>;
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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._cache = {};
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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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}
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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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resolve<K extends keyof ContainerServices<S>, T extends ContainerServices<S>[K] = ContainerServices<S>[K]>(name: K, def?: T): T {
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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);
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try {
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return context.activate(d as Descriptor<S, T>, name.toString());
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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 keyof S, T extends ContainerServices<S>[K] = ContainerServices<S>[K]>(name: K, def?: T) {
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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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for (const name in data) {
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if (Object.prototype.hasOwnProperty.call(data, name)) {
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this.register(name, data[name] as Descriptor<S, S[keyof S]>);
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}
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}
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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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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 | object, 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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createChildContainer<S2 extends { container?: Container<S & S2> } = S>(): Container<S & S2> {
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return new Container<S & S2>(this as any);
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}
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has(id: string | number) {
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return id in this._cache;
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}
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get(id: string | number) {
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return this._cache[id];
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}
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store(id: string | number, value: any) {
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return (this._cache[id] = value);
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}
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}
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