86 lines
2.8 KiB
TypeScript
86 lines
2.8 KiB
TypeScript
/**
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* Copyright (c) 2019 The xterm.js authors. All rights reserved.
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* @license MIT
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*
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* This was heavily inspired from microsoft/vscode's dependency injection system (MIT).
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*/
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/*---------------------------------------------------------------------------------------------
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* Copyright (c) Microsoft Corporation. All rights reserved.
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* Licensed under the MIT License. See License.txt in the project root for license information.
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*--------------------------------------------------------------------------------------------*/
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import { IInstantiationService, IServiceIdentifier } from 'common/services/Services';
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import { getServiceDependencies } from 'common/services/ServiceRegistry';
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export class ServiceCollection {
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private _entries = new Map<IServiceIdentifier<any>, any>();
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constructor(...entries: [IServiceIdentifier<any>, any][]) {
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for (const [id, service] of entries) {
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this.set(id, service);
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}
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}
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public set<T>(id: IServiceIdentifier<T>, instance: T): T {
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const result = this._entries.get(id);
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this._entries.set(id, instance);
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return result;
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}
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public forEach(callback: (id: IServiceIdentifier<any>, instance: any) => any): void {
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for (const [key, value] of this._entries.entries()) {
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callback(key, value);
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}
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}
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public has(id: IServiceIdentifier<any>): boolean {
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return this._entries.has(id);
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}
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public get<T>(id: IServiceIdentifier<T>): T | undefined {
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return this._entries.get(id);
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}
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}
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export class InstantiationService implements IInstantiationService {
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public serviceBrand: undefined;
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private readonly _services: ServiceCollection = new ServiceCollection();
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constructor() {
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this._services.set(IInstantiationService, this);
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}
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public setService<T>(id: IServiceIdentifier<T>, instance: T): void {
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this._services.set(id, instance);
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}
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public getService<T>(id: IServiceIdentifier<T>): T | undefined {
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return this._services.get(id);
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}
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public createInstance<T>(ctor: any, ...args: any[]): T {
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const serviceDependencies = getServiceDependencies(ctor).sort((a, b) => a.index - b.index);
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const serviceArgs: any[] = [];
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for (const dependency of serviceDependencies) {
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const service = this._services.get(dependency.id);
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if (!service) {
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throw new Error(`[createInstance] ${ctor.name} depends on UNKNOWN service ${dependency.id}.`);
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}
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serviceArgs.push(service);
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}
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const firstServiceArgPos = serviceDependencies.length > 0 ? serviceDependencies[0].index : args.length;
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// check for argument mismatches, adjust static args if needed
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if (args.length !== firstServiceArgPos) {
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throw new Error(`[createInstance] First service dependency of ${ctor.name} at position ${firstServiceArgPos + 1} conflicts with ${args.length} static arguments`);
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}
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// now create the instance
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return new ctor(...[...args, ...serviceArgs]);
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}
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}
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