mirror of
https://github.com/NativeScript/NativeScript.git
synced 2025-11-05 13:26:48 +08:00
chore: format
This commit is contained in:
Nathan Walker
@@ -3,224 +3,249 @@ import * as observable from "../../data/observable";
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import * as imageSource from "../../image-source";
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export interface DownloadRequest {
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url: string;
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key: string;
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completed?: (image: any, key: string) => void;
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error?: (key: string) => void;
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url: string;
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key: string;
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completed?: (image: any, key: string) => void;
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error?: (key: string) => void;
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}
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export class Cache extends observable.Observable implements definition.Cache {
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public static downloadedEvent = "downloaded";
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public static downloadErrorEvent = "downloadError";
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public static downloadedEvent = "downloaded";
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public static downloadErrorEvent = "downloadError";
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public placeholder: imageSource.ImageSource;
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public maxRequests = 5;
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private _enabled = true;
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public placeholder: imageSource.ImageSource;
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public maxRequests = 5;
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private _enabled = true;
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private _pendingDownloads = {};
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private _queue: Array<DownloadRequest> = [];
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private _currentDownloads = 0;
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private _pendingDownloads = {};
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private _queue: Array<DownloadRequest> = [];
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private _currentDownloads = 0;
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public enableDownload() {
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if (this._enabled) {
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return;
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}
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public enableDownload() {
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if (this._enabled) {
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return;
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}
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// schedule all pending downloads
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this._enabled = true;
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let request: DownloadRequest;
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// schedule all pending downloads
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this._enabled = true;
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let request: DownloadRequest;
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while (this._queue.length > 0 && this._currentDownloads < this.maxRequests) {
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request = this._queue.pop();
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if (!(request.key in this._pendingDownloads)) {
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this._download(request);
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}
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}
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}
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while (
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this._queue.length > 0 &&
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this._currentDownloads < this.maxRequests
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) {
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request = this._queue.pop();
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if (!(request.key in this._pendingDownloads)) {
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this._download(request);
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}
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}
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}
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public disableDownload() {
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if (!this._enabled) {
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return;
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}
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public disableDownload() {
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if (!this._enabled) {
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return;
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}
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this._enabled = false;
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}
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this._enabled = false;
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}
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public push(request: DownloadRequest): void {
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this._addRequest(request, true);
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}
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public push(request: DownloadRequest): void {
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this._addRequest(request, true);
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}
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public enqueue(request: DownloadRequest): void {
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this._addRequest(request, false);
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}
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public enqueue(request: DownloadRequest): void {
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this._addRequest(request, false);
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}
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private _addRequest(request: DownloadRequest, onTop: boolean): void {
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if (request.key in this._pendingDownloads) {
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const existingRequest = <DownloadRequest>this._pendingDownloads[request.key];
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this._mergeRequests(existingRequest, request);
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}
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else {
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// TODO: Potential performance bottleneck - traversing the whole queue on each download request.
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let queueRequest: DownloadRequest;
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for (let i = 0; i < this._queue.length; i++) {
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if (this._queue[i].key === request.key) {
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queueRequest = this._queue[i];
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break;
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}
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}
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private _addRequest(request: DownloadRequest, onTop: boolean): void {
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if (request.key in this._pendingDownloads) {
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const existingRequest = <DownloadRequest>(
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this._pendingDownloads[request.key]
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);
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this._mergeRequests(existingRequest, request);
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} else {
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// TODO: Potential performance bottleneck - traversing the whole queue on each download request.
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let queueRequest: DownloadRequest;
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for (let i = 0; i < this._queue.length; i++) {
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if (this._queue[i].key === request.key) {
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queueRequest = this._queue[i];
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break;
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}
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}
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if (queueRequest) {
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this._mergeRequests(queueRequest, request);
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}
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else {
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if (this._shouldDownload(request, onTop)) {
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this._download(request);
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}
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}
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}
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}
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if (queueRequest) {
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this._mergeRequests(queueRequest, request);
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} else {
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if (this._shouldDownload(request, onTop)) {
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this._download(request);
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}
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}
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}
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}
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private _mergeRequests(existingRequest: DownloadRequest, newRequest: DownloadRequest) {
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if (existingRequest.completed) {
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if (newRequest.completed) {
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const existingCompleted = existingRequest.completed;
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const stackCompleted = function (result: imageSource.ImageSource, key: string) {
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existingCompleted(result, key);
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newRequest.completed(result, key);
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};
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private _mergeRequests(
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existingRequest: DownloadRequest,
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newRequest: DownloadRequest
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) {
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if (existingRequest.completed) {
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if (newRequest.completed) {
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const existingCompleted = existingRequest.completed;
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const stackCompleted = function (
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result: imageSource.ImageSource,
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key: string
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) {
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existingCompleted(result, key);
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newRequest.completed(result, key);
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};
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existingRequest.completed = stackCompleted;
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}
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}
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else {
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existingRequest.completed = newRequest.completed;
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}
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if (existingRequest.error) {
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if (newRequest.error) {
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const existingError = existingRequest.error;
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const stackError = function (key: string) {
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existingError(key);
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newRequest.error(key);
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};
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existingRequest.completed = stackCompleted;
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}
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} else {
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existingRequest.completed = newRequest.completed;
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}
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if (existingRequest.error) {
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if (newRequest.error) {
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const existingError = existingRequest.error;
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const stackError = function (key: string) {
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existingError(key);
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newRequest.error(key);
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};
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existingRequest.error = stackError;
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}
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}
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else {
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existingRequest.error = newRequest.error;
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}
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}
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existingRequest.error = stackError;
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}
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} else {
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existingRequest.error = newRequest.error;
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}
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}
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public get(key: string): any {
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// This method is intended to be overridden by the android and ios implementations
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throw new Error("Abstract");
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}
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public get(key: string): any {
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// This method is intended to be overridden by the android and ios implementations
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throw new Error("Abstract");
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}
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public set(key: string, image: any): void {
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// This method is intended to be overridden by the android and ios implementations
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throw new Error("Abstract");
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}
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public set(key: string, image: any): void {
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// This method is intended to be overridden by the android and ios implementations
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throw new Error("Abstract");
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}
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public remove(key: string): void {
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// This method is intended to be overridden by the android and ios implementations
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throw new Error("Abstract");
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}
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public remove(key: string): void {
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// This method is intended to be overridden by the android and ios implementations
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throw new Error("Abstract");
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}
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public clear() {
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// This method is intended to be overridden by the android and ios implementations
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throw new Error("Abstract");
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}
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public clear() {
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// This method is intended to be overridden by the android and ios implementations
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throw new Error("Abstract");
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}
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/* tslint:disable:no-unused-variable */
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public _downloadCore(request: definition.DownloadRequest) {
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// This method is intended to be overridden by the android and ios implementations
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throw new Error("Abstract");
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}
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/* tslint:enable:no-unused-variable */
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/* tslint:disable:no-unused-variable */
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public _downloadCore(request: definition.DownloadRequest) {
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// This method is intended to be overridden by the android and ios implementations
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throw new Error("Abstract");
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}
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/* tslint:enable:no-unused-variable */
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public _onDownloadCompleted(key: string, image: any) {
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const request = <DownloadRequest>this._pendingDownloads[key];
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public _onDownloadCompleted(key: string, image: any) {
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const request = <DownloadRequest>this._pendingDownloads[key];
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this.set(request.key, image);
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this._currentDownloads--;
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this.set(request.key, image);
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this._currentDownloads--;
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if (request.completed) {
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request.completed(image, request.key);
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}
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if (request.completed) {
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request.completed(image, request.key);
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}
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if (this.hasListeners(Cache.downloadedEvent)) {
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this.notify({
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eventName: Cache.downloadedEvent,
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object: this,
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key: key,
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image: image
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});
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}
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if (this.hasListeners(Cache.downloadedEvent)) {
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this.notify({
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eventName: Cache.downloadedEvent,
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object: this,
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key: key,
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image: image,
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});
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}
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delete this._pendingDownloads[request.key];
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delete this._pendingDownloads[request.key];
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this._updateQueue();
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}
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this._updateQueue();
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}
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public _onDownloadError(key: string, err: Error) {
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const request = <DownloadRequest>this._pendingDownloads[key];
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this._currentDownloads--;
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public _onDownloadError(key: string, err: Error) {
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const request = <DownloadRequest>this._pendingDownloads[key];
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this._currentDownloads--;
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if (request.error) {
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request.error(request.key);
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}
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if (request.error) {
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request.error(request.key);
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}
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if (this.hasListeners(Cache.downloadErrorEvent)) {
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this.notify({
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eventName: Cache.downloadErrorEvent,
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object: this,
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key: key,
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error: err
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});
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}
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if (this.hasListeners(Cache.downloadErrorEvent)) {
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this.notify({
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eventName: Cache.downloadErrorEvent,
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object: this,
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key: key,
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error: err,
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});
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}
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delete this._pendingDownloads[request.key];
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delete this._pendingDownloads[request.key];
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this._updateQueue();
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}
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this._updateQueue();
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}
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private _shouldDownload(request: definition.DownloadRequest, onTop: boolean): boolean {
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if (this.get(request.key) || request.key in this._pendingDownloads) {
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return false;
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}
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private _shouldDownload(
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request: definition.DownloadRequest,
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onTop: boolean
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): boolean {
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if (this.get(request.key) || request.key in this._pendingDownloads) {
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return false;
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}
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if (this._currentDownloads >= this.maxRequests || !this._enabled) {
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if (onTop) {
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this._queue.push(request);
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}
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else {
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this._queue.unshift(request);
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}
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if (this._currentDownloads >= this.maxRequests || !this._enabled) {
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if (onTop) {
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this._queue.push(request);
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} else {
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this._queue.unshift(request);
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}
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return false;
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}
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return false;
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}
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return true;
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}
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return true;
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}
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private _download(request: definition.DownloadRequest) {
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this._currentDownloads++;
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this._pendingDownloads[request.key] = request;
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private _download(request: definition.DownloadRequest) {
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this._currentDownloads++;
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this._pendingDownloads[request.key] = request;
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this._downloadCore(request);
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}
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this._downloadCore(request);
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}
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private _updateQueue() {
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if (!this._enabled || this._queue.length === 0 || this._currentDownloads === this.maxRequests) {
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return;
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}
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private _updateQueue() {
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if (
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!this._enabled ||
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this._queue.length === 0 ||
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this._currentDownloads === this.maxRequests
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) {
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return;
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}
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const request = this._queue.pop();
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this._download(request);
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}
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const request = this._queue.pop();
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this._download(request);
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}
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}
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export interface Cache {
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on(eventNames: string, callback: (args: observable.EventData) => void, thisArg?: any);
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on(event: "downloaded", callback: (args: definition.DownloadedData) => void, thisArg?: any);
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on(event: "downloadError", callback: (args: definition.DownloadError) => void, thisArg?: any);
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on(
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eventNames: string,
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callback: (args: observable.EventData) => void,
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thisArg?: any
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);
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on(
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event: "downloaded",
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callback: (args: definition.DownloadedData) => void,
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thisArg?: any
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);
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on(
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event: "downloadError",
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callback: (args: definition.DownloadError) => void,
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thisArg?: any
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);
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}
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