@awesome-nodes/mvvm/lib-esm/mvvm/model/ActionObserver.js

Application development framework using the *model* *view* *view-model* design pattern.

function _classPrivateFieldLooseBase(receiver, privateKey) { if (!Object.prototype.hasOwnProperty.call(receiver, privateKey)) { throw new TypeError("attempted to use private field on non-instance"); } return receiver; }

var id = 0;

function _classPrivateFieldLooseKey(name) { return "__private_" + id++ + "_" + name; }

import { EventArgs } from '@awesome-nodes/object';
import { Disposable } from "./Disposable";
import { BehaviorSubject, throwError } from 'rxjs';

var _thisArg2 = _classPrivateFieldLooseKey("_thisArg");

var _actionObservable = _classPrivateFieldLooseKey("_actionObservable");

var _actionSubscription = _classPrivateFieldLooseKey("_actionSubscription");

var _nextResult = _classPrivateFieldLooseKey("_nextResult");

var _nextResult$ = _classPrivateFieldLooseKey("_nextResult$");

var _actionResult = _classPrivateFieldLooseKey("_actionResult");

var _actionResult$ = _classPrivateFieldLooseKey("_actionResult$");

var _onProgress = _classPrivateFieldLooseKey("_onProgress");

var _onError = _classPrivateFieldLooseKey("_onError");

var _onComplete = _classPrivateFieldLooseKey("_onComplete");

export class ActionObserver extends Disposable {
  get action() {
    return _classPrivateFieldLooseBase(this, _actionObservable)[_actionObservable];
  }

  get actionResult() {
    return _classPrivateFieldLooseBase(this, _actionResult$)[_actionResult$];
  }

  get actionResultValue() {
    return _classPrivateFieldLooseBase(this, _actionResult)[_actionResult].getValue();
  }

  get actionResultAvailable() {
    return !!this.actionResultValue && this.actionResultValue !== this._defaultResult;
  }

  get nextResult() {
    return _classPrivateFieldLooseBase(this, _nextResult$)[_nextResult$];
  }

  get nextValue() {
    return _classPrivateFieldLooseBase(this, _nextResult)[_nextResult].getValue();
  }

  get nextResultAvailable() {
    return !!this.nextValue && this.nextValue !== this._defaultResult;
  }

  set onProgress(value) {
    _classPrivateFieldLooseBase(this, _onProgress)[_onProgress] = _classPrivateFieldLooseBase(this, _thisArg2)[_thisArg2] ? value.bind(_classPrivateFieldLooseBase(this, _thisArg2)[_thisArg2]) : value;
  }

  set onError(value) {
    _classPrivateFieldLooseBase(this, _onError)[_onError] = value;
  }

  set onComplete(value) {
    _classPrivateFieldLooseBase(this, _onComplete)[_onComplete] = _classPrivateFieldLooseBase(this, _thisArg2)[_thisArg2] ? value.bind(_classPrivateFieldLooseBase(this, _thisArg2)[_thisArg2]) : value;
  }

  constructor(_thisArg, _defaultResult) {
    super();
    this._defaultResult = _defaultResult;
    Object.defineProperty(this, _thisArg2, {
      writable: true,
      value: void 0
    });
    Object.defineProperty(this, _actionObservable, {
      writable: true,
      value: void 0
    });
    Object.defineProperty(this, _actionSubscription, {
      writable: true,
      value: void 0
    });
    Object.defineProperty(this, _nextResult, {
      writable: true,
      value: void 0
    });
    Object.defineProperty(this, _nextResult$, {
      writable: true,
      value: void 0
    });
    Object.defineProperty(this, _actionResult, {
      writable: true,
      value: void 0
    });
    Object.defineProperty(this, _actionResult$, {
      writable: true,
      value: void 0
    });
    Object.defineProperty(this, _onProgress, {
      writable: true,
      value: void 0
    });
    Object.defineProperty(this, _onError, {
      writable: true,
      value: void 0
    });
    Object.defineProperty(this, _onComplete, {
      writable: true,
      value: void 0
    });
    _classPrivateFieldLooseBase(this, _thisArg2)[_thisArg2] = _thisArg || this;
    _classPrivateFieldLooseBase(this, _nextResult)[_nextResult] = new BehaviorSubject(_defaultResult);
    _classPrivateFieldLooseBase(this, _nextResult$)[_nextResult$] = _classPrivateFieldLooseBase(this, _nextResult)[_nextResult].asObservable();
    _classPrivateFieldLooseBase(this, _actionResult)[_actionResult] = new BehaviorSubject(_defaultResult);
    _classPrivateFieldLooseBase(this, _actionResult$)[_actionResult$] = _classPrivateFieldLooseBase(this, _actionResult)[_actionResult].asObservable();
  }

  observe(action, observer) {
    let observableResult = {};

    if (observer) {
      if (typeof observer == 'function') {
        observableResult = {
          next: result => {
            _classPrivateFieldLooseBase(this, _nextResult)[_nextResult].next(result);

            observer.bind(_classPrivateFieldLooseBase(this, _thisArg2)[_thisArg2])(_classPrivateFieldLooseBase(this, _thisArg2)[_thisArg2], EventArgs.empty);
          },
          complete: () => {
            _classPrivateFieldLooseBase(this, _actionResult)[_actionResult].next(_classPrivateFieldLooseBase(this, _nextResult)[_nextResult].getValue());
          }
        };
      } else {
        if (_classPrivateFieldLooseBase(this, _onProgress)[_onProgress] && observer.init) _classPrivateFieldLooseBase(this, _onProgress)[_onProgress](_classPrivateFieldLooseBase(this, _thisArg2)[_thisArg2], observer.init());

        observableResult.error = e => {
          if (observer.error) observer.error(e);else if (_classPrivateFieldLooseBase(this, _onError)[_onError]) _classPrivateFieldLooseBase(this, _onError)[_onError](e);else console.error(e);
        };

        observableResult.next = result => {
          if (result instanceof Error) {
            observableResult.error(result);
            return;
          }

          _classPrivateFieldLooseBase(this, _nextResult)[_nextResult].next(result);

          if (_classPrivateFieldLooseBase(this, _onProgress)[_onProgress] && observer.next) _classPrivateFieldLooseBase(this, _onProgress)[_onProgress](_classPrivateFieldLooseBase(this, _thisArg2)[_thisArg2], observer.next(result));
        };

        observableResult.complete = () => {
          _classPrivateFieldLooseBase(this, _actionResult)[_actionResult].next(_classPrivateFieldLooseBase(this, _nextResult)[_nextResult].getValue());

          if (_classPrivateFieldLooseBase(this, _onComplete)[_onComplete] && observer.complete) _classPrivateFieldLooseBase(this, _onComplete)[_onComplete](_classPrivateFieldLooseBase(this, _thisArg2)[_thisArg2], observer.complete());
        };
      }
    }

    try {
      _classPrivateFieldLooseBase(this, _actionObservable)[_actionObservable] = action();
    } catch (exception) {
      (_classPrivateFieldLooseBase(this, _onError)[_onError] || console.error)(exception);
      _classPrivateFieldLooseBase(this, _actionObservable)[_actionObservable] = throwError(exception);
    }

    if (observer) _classPrivateFieldLooseBase(this, _actionSubscription)[_actionSubscription] = _classPrivateFieldLooseBase(this, _actionObservable)[_actionObservable].subscribe(observableResult);
    return _classPrivateFieldLooseBase(this, _actionObservable)[_actionObservable];
  }

  cancel() {
    _classPrivateFieldLooseBase(this, _actionSubscription)[_actionSubscription] && !_classPrivateFieldLooseBase(this, _actionSubscription)[_actionSubscription].closed && _classPrivateFieldLooseBase(this, _actionSubscription)[_actionSubscription].unsubscribe();
  }

  reset() {
    _classPrivateFieldLooseBase(this, _nextResult)[_nextResult].next(this._defaultResult);

    _classPrivateFieldLooseBase(this, _actionResult)[_actionResult].next(this._defaultResult);
  }

  equals(other) {
    return super.equals(other) && _classPrivateFieldLooseBase(this, _actionResult)[_actionResult] === _classPrivateFieldLooseBase(other, _actionResult)[_actionResult];
  }

  dispose(disposing) {
    if (disposing && !this.isDisposed) {
      this.cancel();

      _classPrivateFieldLooseBase(this, _nextResult)[_nextResult].unsubscribe();

      _classPrivateFieldLooseBase(this, _actionResult)[_actionResult].unsubscribe();
    }

    super.dispose(disposing);
  }

}
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{ EventArgs, IEvent } from '@awesome-nodes/object';\nimport { Disposable } from 'mvvm/model/Disposable';\nimport { ObjectModel } from 'mvvm/model/ObjectModel';\nimport { BehaviorSubject, Observable, PartialObserver, Subscription, throwError } from 'rxjs';\nimport { Nullable } from 'simplytyped';\n\n\nexport interface IPartialActionObserver<T, TEventArgs extends EventArgs = EventArgs>\n{\n    init?: () => TEventArgs;\n    next?: (value: T) => TEventArgs;\n    error?: (error: Error) => void;\n    complete?: () => TEventArgs;\n}\n\n/**\n * A object model utility for watching observables using command pattern style handler functions\n * which are bound to the provided {@see ActionObserver.#_thisArg} argument.\n * @template T\n */\nexport class ActionObserver<T> extends Disposable\n{\n    //region Instance Members\n\n    readonly #_thisArg: ObjectModel;\n    #_actionObservable?: Observable<T>;\n    #_actionSubscription?: Subscription;\n    readonly #_nextResult: BehaviorSubject<T>;\n    readonly #_nextResult$: Observable<T>;\n    readonly #_actionResult: BehaviorSubject<T>;\n    readonly #_actionResult$: Observable<T>;\n    #_onProgress?: IEvent<ObjectModel>;\n    #_onError?: (e: Error) => void;\n    #_onComplete?: IEvent<ObjectModel>;\n\n    //endregion\n\n    //region Public Properties\n\n    //region Action Observable\n\n    /**\n     * Returns the observable returned from the last observed action.\n     * @description Subscribe to observe the latest observed action.\n     */\n    public get action(): Nullable<Observable<T>>\n    {\n        return this.#_actionObservable;\n    }\n\n    /**\n     * Returns the last 'next' result from the last observed action.\n     * @description Subscribe to receive the final 'next' result of any called action.\n     */\n    public get actionResult(): Observable<T>\n    {\n        return this.#_actionResult$;\n    }\n\n    /**\n     * Returns the last 'next' result value from the last observed action.\n     * @description Bind to receive the final 'next' result value of any called action.\n     */\n    public get actionResultValue(): T\n    {\n        return this.#_actionResult.getValue();\n    }\n\n    /**\n     * Returns a boolean value indicating weather this instance has ever received a result\n     * other than the `ActionObserver._defaultResult` from an action.\n     */\n    public get actionResultAvailable(): boolean\n    {\n        return !!this.actionResultValue && this.actionResultValue !== this._defaultResult;\n    }\n\n    //endregion\n\n    //region Next Result Observable\n\n    /**\n     * Returns the 'next' result from the currently observed action.\n     * @description Subscribe to receive the 'next' result of any called action.\n     */\n    public get nextResult(): Observable<T>\n    {\n        return this.#_nextResult$;\n    }\n\n    /**\n     * Returns the 'next' result value from the currently observed action.\n     * @description Bind to receive the 'next' result value of any called action.\n     */\n    public get nextValue(): T\n    {\n        return this.#_nextResult.getValue();\n    }\n\n    /**\n     * Returns a boolean value indicating weather this instance has ever received a result\n     * other than the `ActionObserver._defaultResult` from an action.\n     */\n    public get nextResultAvailable(): boolean\n    {\n        return !!this.nextValue && this.nextValue !== this._defaultResult;\n    }\n\n    //endregion\n\n    /**\n     * Sets a command pattern style function used to observe {@link NextObserver.next} events.\n     * @param {IEvent<ObjectModel>} value\n     */\n    public set onProgress(value: IEvent<ObjectModel>)\n    {\n        this.#_onProgress = this.#_thisArg ? value.bind(this.#_thisArg) : value;\n    }\n\n    /**\n     * Sets an error handler function used to observe {@link ErrorObserver.error} events.\n     * Note: The error handler function is not bound to this instance.\n     * @param {IEvent<ObjectModel>} value\n     */\n    public set onError(value: (e: Error) => void)\n    {\n        this.#_onError = value;\n    }\n\n    /**\n     * Sets a command pattern style function used to observe {@link CompletionObserver.complete} events.\n     * @param {IEvent<ObjectModel>} value\n     */\n    public set onComplete(value: IEvent<ObjectModel>)\n    {\n        this.#_onComplete = this.#_thisArg ? value.bind(this.#_thisArg) : value;\n    }\n\n    //endregion\n\n    /**\n     *\n     * @param _thisArg If provided, all observer functions are invoked on except the error observer.\n     * @param _defaultResult if provided, it will be used as default value for the\n     */\n    public constructor(_thisArg?: ObjectModel, private readonly _defaultResult?: T)\n    {\n        super();\n        this.#_thisArg       = _thisArg || this;\n        this.#_nextResult    = new BehaviorSubject<T>(_defaultResult!);\n        this.#_nextResult$   = this.#_nextResult.asObservable();\n        this.#_actionResult  = new BehaviorSubject<T>(_defaultResult!);\n        this.#_actionResult$ = this.#_actionResult.asObservable();\n    }\n\n    /**\n     * Observes actions by additionally using a provided next observer function or `PartialActionObserver` instance.\n     * @param action\n     * @param observer\n     */\n    public observe<TSender extends ObjectModel, TEventArgs extends EventArgs>(\n        action: () => Observable<T>,\n        observer?: IEvent<TSender, TEventArgs> | IPartialActionObserver<T, TEventArgs>): Observable<T>\n    {\n        let observableResult = {} as PartialObserver<T>;\n        if (observer) {\n            if (typeof observer == 'function') {\n                observableResult = {\n                    next    : (result: T): void =>\n                    {\n                        this.#_nextResult.next(result);\n                        observer.bind(this.#_thisArg)(this.#_thisArg as TSender, EventArgs.empty as TEventArgs);\n                    },\n                    complete: (): void =>\n                    {\n                        this.#_actionResult.next(this.#_nextResult.getValue());\n                    },\n                };\n            } else {\n                if (this.#_onProgress && observer.init)\n                    this.#_onProgress(this.#_thisArg, observer.init());\n\n                observableResult.error = (e: Error): void =>\n                {\n                    if (observer.error)\n                        observer.error(e);\n                    else if (this.#_onError)\n                        this.#_onError(e);\n                    else\n                        console.error(e);\n                };\n\n                observableResult.next = (result: T) =>\n                {\n                    if (result instanceof Error) {\n                        //eslint-disable-next-line @typescript-eslint/no-explicit-any\n                        (observableResult as any).error(result);\n\n                        return;\n                    }\n                    this.#_nextResult.next(result);\n                    if (this.#_onProgress && observer.next)\n                        this.#_onProgress(this.#_thisArg, observer.next(result));\n                };\n\n                observableResult.complete = () =>\n                {\n                    this.#_actionResult.next(this.#_nextResult.getValue());\n                    if (this.#_onComplete && observer.complete)\n                        this.#_onComplete(this.#_thisArg, observer.complete());\n                };\n            }\n        }\n        try {\n            this.#_actionObservable = action();\n        }\n        catch (exception) {\n            (this.#_onError || console.error)(exception as Error);\n            this.#_actionObservable = throwError(exception);\n        }\n\n        if (observer)\n            this.#_actionSubscription = this.#_actionObservable.subscribe(observableResult);\n\n        return this.#_actionObservable;\n    }\n\n    public cancel(): void\n    {\n        this.#_actionSubscription && !this.#_actionSubscription.closed && this.#_actionSubscription.unsubscribe();\n    }\n\n    public reset(): void\n    {\n        this.#_nextResult.next(this._defaultResult!);\n        this.#_actionResult.next(this._defaultResult!);\n    }\n\n    /** @inheritDoc */\n    public equals(other: ActionObserver<T>): boolean\n    {\n        return super.equals(other) && this.#_actionResult === other.#_actionResult;\n    }\n\n    /** @inheritDoc */\n    //tslint:disable-next-line:no-flag-args\n    public dispose(disposing?: boolean): void\n    {\n        if (disposing && !this.isDisposed) {\n            this.cancel();\n            this.#_nextResult.unsubscribe();\n            this.#_actionResult.unsubscribe();\n        }\n        super.dispose(disposing);\n    }\n}\n"]}