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import { ObjectType } from './types/ObjectType';
import { Token } from './Token';
import { ServiceIdentifier } from './types/ServiceIdentifier';
import { ServiceNotFoundError } from './error/ServiceNotFoundError';
import { MissingProvidedServiceTypeError } from './error/MissingProvidedServiceTypeError';
import { Container } from './Container';
import { ControllerContainerService } from '..';
import { controllerHooks } from '../services/controller-service/controller-hooks';
import { effectHooks } from '../services/effect-hook/effect-hooks';
/**
* TypeDI can have multiple containers.
* One container is ContainerInstance.
*/
export class ContainerInstance {
// -------------------------------------------------------------------------
// Public Properties
// -------------------------------------------------------------------------
/**
* Container instance id.
*/
id: any;
// -------------------------------------------------------------------------
// Private Properties
// -------------------------------------------------------------------------
/**
* All registered services.
*/
private services: ServiceMetadata<any, any>[] = [];
// -------------------------------------------------------------------------
// Constructor
// -------------------------------------------------------------------------
constructor(id: any) {
this.id = id;
}
// -------------------------------------------------------------------------
// Public Methods
// -------------------------------------------------------------------------
/**
* Checks if the service with given name or type is registered service container.
* Optionally, parameters can be passed in case if instance is initialized in the container for the first time.
*/
has<T>(type: ObjectType<T>): boolean;
/**
* Checks if the service with given name or type is registered service container.
* Optionally, parameters can be passed in case if instance is initialized in the container for the first time.
*/
has<T>(id: string): boolean;
/**
* Checks if the service with given name or type is registered service container.
* Optionally, parameters can be passed in case if instance is initialized in the container for the first time.
*/
has<T>(id: Token<T>): boolean;
/**
* Checks if the service with given name or type is registered service container.
* Optionally, parameters can be passed in case if instance is initialized in the container for the first time.
*/
has<T>(identifier: ServiceIdentifier): boolean {
return !!this.findService(identifier);
}
/**
* Retrieves the service with given name or type from the service container.
* Optionally, parameters can be passed in case if instance is initialized in the container for the first time.
*/
get<T>(type: ObjectType<T>): T;
/**
* Retrieves the service with given name or type from the service container.
* Optionally, parameters can be passed in case if instance is initialized in the container for the first time.
*/
get<T>(id: string): T;
/**
* Retrieves the service with given name or type from the service container.
* Optionally, parameters can be passed in case if instance is initialized in the container for the first time.
*/
get<T>(id: Token<T>): T;
/**
* Retrieves the service with given name or type from the service container.
* Optionally, parameters can be passed in case if instance is initialized in the container for the first time.
*/
get<T>(identifier: ServiceIdentifier): T {
const globalContainer = Container.of(undefined);
const service = globalContainer.findService(identifier);
const scopedService = this.findService(identifier);
Iif (service && service.global === true)
return this.getServiceValue(identifier, service);
if (scopedService)
return this.getServiceValue(identifier, scopedService);
Iif (service && this !== globalContainer) {
const clonedService = Object.assign({}, service);
clonedService.value = undefined;
return this.getServiceValue(identifier, clonedService);
}
return this.getServiceValue(identifier, service);
}
/**
* Gets all instances registered in the container of the given service identifier.
* Used when service defined with multiple: true flag.
*/
getMany<T>(id: string): T[];
/**
* Gets all instances registered in the container of the given service identifier.
* Used when service defined with multiple: true flag.
*/
getMany<T>(id: Token<T>): T[];
/**
* Gets all instances registered in the container of the given service identifier.
* Used when service defined with multiple: true flag.
*/
getMany<T>(id: string | Token<T>): T[] {
return this.filterServices(id).map(service => this.getServiceValue(id, service));
}
/**
* Sets a value for the given type or service name in the container.
*/
set<T, K extends keyof T>(service: ServiceMetadata<T, K>): this;
/**
* Sets a value for the given type or service name in the container.
*/
set(type: Function, value: any): this;
/**
* Sets a value for the given type or service name in the container.
*/
set(name: string, value: any): this;
/**
* Sets a value for the given type or service name in the container.
*/
set(token: Token<any>, value: any): this;
/**
* Sets a value for the given type or service name in the container.
*/
set<T, K extends keyof T>(values: ServiceMetadata<T, K>[]): this;
/**
* Sets a value for the given type or service name in the container.
*/
set(identifierOrServiceMetadata: ServiceIdentifier | ServiceMetadata<any, any> | (ServiceMetadata<any, any>[]), value?: any): this {
Iif (identifierOrServiceMetadata instanceof Array) {
identifierOrServiceMetadata.forEach((v: any) => this.set(v));
return this;
}
if (typeof identifierOrServiceMetadata === 'string' || identifierOrServiceMetadata instanceof Token) {
return this.set({ id: identifierOrServiceMetadata, value: value });
}
Iif (identifierOrServiceMetadata instanceof Function) {
return this.set({ type: identifierOrServiceMetadata, id: identifierOrServiceMetadata, value: value });
}
// const newService: ServiceMetadata<any, any> = arguments.length === 1 && typeof identifierOrServiceMetadata === 'object' && !(identifierOrServiceMetadata instanceof Token) ? identifierOrServiceMetadata : undefined;
const newService: ServiceMetadata<any, any> = identifierOrServiceMetadata;
const service = this.findService(newService.id);
Iif (service && service.multiple !== true) {
Object.assign(service, newService);
} else {
this.services.push(newService);
}
return this;
}
/**
* Removes services with a given service identifiers (tokens or types).
*/
remove(...ids: ServiceIdentifier[]): this {
ids.forEach(id => {
this.filterServices(id).forEach(service => {
this.services.splice(this.services.indexOf(service), 1);
});
});
return this;
}
/**
* Completely resets the container by removing all previously registered services from it.
*/
reset(): this {
this.services = [];
return this;
}
// -------------------------------------------------------------------------
// Private Methods
// -------------------------------------------------------------------------
/**
* Filters registered service in the with a given service identifier.
*/
private filterServices(identifier: ServiceIdentifier): ServiceMetadata<any, any>[] {
return this.services.filter(service => {
if (service.id)
return service.id === identifier;
if (service.type && identifier instanceof Function)
return service.type === identifier || identifier.prototype instanceof service.type;
return false;
});
}
/**
* Finds registered service in the with a given service identifier.
*/
private findService(identifier: ServiceIdentifier): ServiceMetadata<any, any> | undefined {
return this.services.find(service => {
if (service.id)
return service.id === identifier;
if (service.type && identifier instanceof Function)
return service.type === identifier; // || identifier.prototype instanceof service.type;
return false;
});
}
/**
* Gets service value.
*/
private getServiceValue(identifier: ServiceIdentifier, service: ServiceMetadata<any, any> | undefined): any {
// find if instance of this object already initialized in the container and return it if it is
if (service && service.value !== null && service.value !== undefined)
return service.value;
// if named service was requested and its instance was not found plus there is not type to know what to initialize,
// this means service was not pre-registered and we throw an exception
Iif ((!service || !service.type) &&
(!service || !service.factory) &&
(typeof identifier === 'string' || identifier instanceof Token))
throw new ServiceNotFoundError(identifier);
// at this point we either have type in service registered, either identifier is a target type
let type = undefined;
if (service && service.type) {
type = service.type;
} else Iif (service && service.id instanceof Function) {
type = service.id;
} else Eif (identifier instanceof Function) {
type = identifier;
}
// if service was not found then create a new one and register it
if (!service) {
Iif (!type)
throw new MissingProvidedServiceTypeError(identifier);
service = { type: type };
this.services.push(service);
}
// setup constructor parameters for a newly initialized service
const paramTypes = type && Reflect && (Reflect as any).getMetadata ? (Reflect as any).getMetadata('design:paramtypes', type) : undefined;
let params: any[] = paramTypes ? this.initializeParams(type, paramTypes) : [];
// if factory is set then use it to create service instance
let value: any;
Iif (service.factory) {
// filter out non-service parameters from created service constructor
// non-service parameters can be, lets say Car(name: string, isNew: boolean, engine: Engine)
// where name and isNew are non-service parameters and engine is a service parameter
params = params.filter(param => param !== undefined);
if (service.factory instanceof Array) {
// use special [Type, 'create'] syntax to allow factory services
// in this case Type instance will be obtained from Container and its method 'create' will be called
value = (this.get(service.factory[0]) as any)[service.factory[1]](...params);
} else { // regular factory function
value = service.factory(...params);
}
} else { // otherwise simply create a new object instance
Iif (!type)
throw new MissingProvidedServiceTypeError(identifier);
params.unshift(null);
// 'extra feature' - always pass container instance as the last argument to the service function
// this allows us to support javascript where we don't have decorators and emitted metadata about dependencies
// need to be injected, and user can use provided container to get instances he needs
params.push(this);
value = new (type.bind.apply(type, params))();
if (type.prototype._controller) {
controllerHooks.setHook(type.name, value);
}
Iif (type.prototype._effect) {
console.log(type.name);
effectHooks.setHook(type.name, value);
}
}
Eif (service && !service.transient && value)
service.value = value;
Eif (type)
this.applyPropertyHandlers(type, value);
return value;
}
/**
* Initializes all parameter types for a given target service class.
*/
private initializeParams(type: Function, paramTypes: any[]): any[] {
return paramTypes.map((paramType, index) => {
const paramHandler = Container.handlers.find(handler => handler.object === type && handler.index === index);
if (paramHandler)
return paramHandler.value(this);
if (paramType && paramType.name && !this.isTypePrimitive(paramType.name)) {
return this.get(paramType);
}
return undefined;
});
}
/**
* Checks if given type is primitive (e.g. string, boolean, number, object).
*/
private isTypePrimitive(param: string): boolean {
return ['string', 'boolean', 'number', 'object'].indexOf(param.toLowerCase()) !== -1;
}
/**
* Applies all registered handlers on a given target class.
*/
private applyPropertyHandlers(target: Function, instance: { [key: string]: any }) {
Container.handlers.forEach(handler => {
if (typeof handler.index === 'number') return;
if (handler.object.constructor !== target && !(target.prototype instanceof handler.object.constructor))
return;
instance[handler.propertyName] = handler.value(this);
});
}
}
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