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import { IContainer } from "./interfaces/IContainer";
import { InstantiationModeCO } from "./chainingOptions/InstantiationModeCO";
import { IInstantiatable, IInstantiationMode } from "./interfaces/IInstantiatable";
import { IResolver } from "./interfaces/IResolver";
import { ConstructorInstantiation } from "./definitions/ConstructorInstantiation";
import { ConstantInstantiation } from "./definitions/ConstantInstantiation";
import { IInterceptor } from "./interfaces/IInterceptor";
import { Initializers } from "./modifiers/Initializers";
import { Utils } from "./Utils";
import { DefinitionRepository } from "./DefinitionRepository";
import { Keys } from "./Keys";
import { v4 as uuidv4 } from "uuid";
import { Type } from "./interfaces/IType";
import { IInitializer } from "./modifiers/initializers/IInitializer";
import { IBaseDefinition } from "./definitions/definitionInterfaces/IBaseDefinition";
import { IInjectableOptions } from "./decorators/Injectable";
import { isObject, isPrimitive } from "util";
import { Logger } from "./Logger";
export type singletonsType = Map<string, any>;
export type logLevelType = "none" | "debug";
export interface IContainerOption {
enableAutoCreate: boolean; // if dependency not exist in the container, creat it and register
initializers?: Type<IInitializer>[];
logLevel?: logLevelType;
}
export class Container implements IContainer, IResolver {
private logger: Logger;
definitionsRepository = new DefinitionRepository(this.options);
protected singletons: singletonsType = new Map<string, any>();
interceptors: IInterceptor[] = [];
initializers = new Initializers(this);
protected DEFAULT_INSTANTIATION: IInstantiationMode = "singleton";
constructor(public readonly options: IContainerOption = {
enableAutoCreate: false,
initializers: [],
logLevel: "none"
}) {
this.initializers.addInitializers(options.initializers || []);
this.logger = new Logger(Container.name, options.logLevel || "none");
}
/**
* Key-Value registration. You can inject the registered keys with @Inject(key) decorator
*/
public register(key: string, value: any): InstantiationModeCO {
const decoratorTags = Utils.getMeta<string[]>(Keys.ADD_TAGS_KEY, value, []);
const injectableMeta = Utils.getMeta<IInjectableOptions>(Keys.INJECTABLE_KEY, value, {instantiation: this.DEFAULT_INSTANTIATION});
this.logger.debug(`Register: key: ${key} --> value: ${isPrimitive(value) || isObject(value) ? JSON.stringify(value, null, 2) : Utils.logClass(value)}`);
this.setDefinition(key, this.getDefaultInstantiationDef(key, value, decoratorTags, injectableMeta.instantiation));
return new InstantiationModeCO(this, key);
}
/**
* Types registration to the container with a random key
* (type injection don't need keys but if {autoCreate: false} you need to register everything)
* @param constructors
*/
public registerTypes(constructors: Type[]): void {
for (const constructor of constructors) {
Iif (constructor.name === "String" || constructor.name === "Number") {
throw new Error(`Can't register primitive as type. Please register another way: ${constructor.name}`);
}
const id = uuidv4();
this.logger.debug(`registerType: ${Utils.logClass(constructor)} key: ${id}`);
this.register(uuidv4(), constructor);
}
}
/**
* Resolve type
* @param constructor resolvable ctr
*/
public async resolveByType<T>(constructor: Type<T>): Promise<T> {
const def = this.definitionsRepository.getDefinitionByType(constructor);
this.logger.debug("Try to resolve: " + Utils.logClass(constructor));
if (def === Keys.AUTO_CREATE_DEPENDENCY && this.options.enableAutoCreate) {
this.logger.debug("AUTO_CREATE_DEPENDENCY: " + Utils.logClass(constructor));
this.registerTypes([constructor]);
return this.resolveByType(constructor);
} else if (def) {
const instantiatable = (this.definitionsRepository.getDefinitionByType(constructor) as IInstantiatable);
const instance = instantiatable.instantiate();
return this.applyModificationToInstance(instance, instantiatable.definition);
} else E{
throw new Error(`cannot resolve ${constructor}`);
}
}
/**
* Resolve key
* @param key registered key (by register(key: string, value: any))
*/
public async resolve<T>(key: string): Promise<T> {
const instantiatable: IInstantiatable = this.definitionsRepository.getDefinition(key);
this.logger.debug(`Try to resolve key: "${key}" as ${instantiatable.definition.instantiationMode}`);
switch (instantiatable.definition.instantiationMode) {
case "prototype": {
const originalInstance = await this.resolvePrototype<T>(instantiatable.definition.key);
return this.applyModificationToInstance(originalInstance, instantiatable.definition);
}
case "singleton": {
return this.resolveSingleton<T>(instantiatable);
}
default: {
throw new Error(`Cannot resolve: ${key} because instantiationMode is: ${instantiatable.definition.instantiationMode}`);
}
}
}
async applyModificationToInstance(instance: any, definition: IBaseDefinition) {
instance = await this.initializers.runInitializers(instance, definition);
return instance;
}
async resolveByTags(tags: string | string[]): Promise<any[]> {
if (typeof tags === "string") { tags = [tags]; }
const keys = this.definitionsRepository.getDefinitionKeysBySpecificTags(tags);
const result = [];
for (const key of keys) {
result.push(await this.resolve(key));
}
return result;
}
addInterceptor(interceptor: IInterceptor): void {
this.interceptors.push(interceptor);
}
/**
* resolve test for all keys.
*/
async containerTest() {
for (const key of this.definitionsRepository.definitions.keys()) {
try {
await this.resolve<any>(key);
} catch (err) {
throw new Error(`Not proper registration. details: ${err}`);
}
}
}
/**
* run interceptors. Run this after all key was registered.
*/
async done(): Promise<any> {
await this.containerTest();
this.runInterceptors();
}
private runInterceptors() {
this.interceptors.forEach((interceptor: IInterceptor) => {
interceptor.intercept(this);
});
}
hasKeyInDefinition(key: string): boolean {
return this.definitionsRepository.definitions.has(key);
}
private setDefinition(key: string, definition: IInstantiatable) {
this.definitionsRepository.definitions.set(key, definition);
}
private getDefaultInstantiationDef(key: string, content: any, decoratorTags: string[], instantiationMode?: IInstantiationMode): IInstantiatable {
if (Utils.isClass(content)) {
const classInstance = new ConstructorInstantiation({
key,
content,
context: {},
instantiationMode: instantiationMode || this.DEFAULT_INSTANTIATION,
}, this);
classInstance.tags = [...decoratorTags];
return classInstance;
}
return new ConstantInstantiation({
key,
content,
instantiationMode: this.DEFAULT_INSTANTIATION
});
}
private async resolvePrototype<T>(key: string): Promise<T> {
return this.definitionsRepository.getDefinition(key).instantiate();
}
private async resolveSingleton<T>(instantiatable: IInstantiatable): Promise<T> {
if (!this.singletons.has(instantiatable.definition.key)) {
let newInstance = await instantiatable.instantiate();
newInstance = this.applyModificationToInstance(newInstance, instantiatable.definition);
this.singletons.set(instantiatable.definition.key, newInstance);
return this.singletons.get(instantiatable.definition.key);
}
return this.singletons.get(instantiatable.definition.key);
}
private getTagsMeta(ctr: Type) {
Iif (!Utils.isClass(ctr)) return;
const meta = Reflect.getMetadata(Keys.ADD_TAGS_KEY, ctr.prototype) || {};
return meta[Keys.ADD_TAGS_KEY] || [];
}
}
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