Class Context

packages/context/src/context.ts:53–1022

 * Context provides an implementation of Inversion of Control (IoC) container
 */
export class Context extends EventEmitter {
  /**
   * Name of the context
   */
  readonly name: string;

  /**
   * Key to binding map as the internal registry
   */
  protected readonly registry: Map<string, Binding> = new Map();

  /**
   * Indexer for bindings by tag
   */
  protected readonly tagIndexer: ContextTagIndexer;

  /**
   * Manager for observer subscriptions
   */
  readonly subscriptionManager: ContextSubscriptionManager;

  /**
   * Parent context
   */
  protected _parent?: Context;

  /**
   * Configuration resolver
   */
  protected configResolver: ConfigurationResolver;

  /**
   * A debug function which can be overridden by subclasses.
   *
   * @example
   * ```ts
   * import debugFactory from 'debug';
   * const debug = debugFactory('loopback:context:application');
   * export class Application extends Context {
   *   super('application');
   *   this._debug = debug;
   * }
   * ```
   */
  protected _debug: Debugger;

  /**
   * Scope for binding resolution
   */
  scope: BindingScope = BindingScope.CONTEXT;

  /**
   * Create a new context.
   *
   * @example
   * ```ts
   * // Create a new root context, let the framework to create a unique name
   * const rootCtx = new Context();