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245 lines
8.9 KiB
JavaScript
245 lines
8.9 KiB
JavaScript
/*
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* OpenSeadragon - ImageLoader
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*
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* Copyright (C) 2009 CodePlex Foundation
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* Copyright (C) 2010-2022 OpenSeadragon contributors
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* - Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* - Neither the name of CodePlex Foundation nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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(function($){
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/**
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* @class ImageJob
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* @classdesc Handles downloading of a single image.
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* @param {Object} options - Options for this ImageJob.
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* @param {String} [options.src] - URL of image to download.
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* @param {Tile} [options.tile] - Tile that belongs the data to.
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* @param {TileSource} [options.source] - Image loading strategy
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* @param {String} [options.loadWithAjax] - Whether to load this image with AJAX.
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* @param {String} [options.ajaxHeaders] - Headers to add to the image request if using AJAX.
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* @param {Boolean} [options.ajaxWithCredentials] - Whether to set withCredentials on AJAX requests.
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* @param {String} [options.crossOriginPolicy] - CORS policy to use for downloads
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* @param {String} [options.postData] - HTTP POST data (usually but not necessarily in k=v&k2=v2... form,
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* see TileSource::getPostData) or null
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* @param {Function} [options.callback] - Called once image has been downloaded.
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* @param {Function} [options.abort] - Called when this image job is aborted.
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* @param {Number} [options.timeout] - The max number of milliseconds that this image job may take to complete.
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*/
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$.ImageJob = function(options) {
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$.extend(true, this, {
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timeout: $.DEFAULT_SETTINGS.timeout,
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jobId: null
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}, options);
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/**
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* Data object which will contain downloaded image data.
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* @member {Image|*} image data object, by default an Image object (depends on TileSource)
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* @memberof OpenSeadragon.ImageJob#
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*/
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this.data = null;
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/**
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* User workspace to populate with helper variables
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* @member {*} userData to append custom data and avoid namespace collision
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* @memberof OpenSeadragon.ImageJob#
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*/
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this.userData = {};
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/**
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* Error message holder
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* @member {string} error message
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* @memberof OpenSeadragon.ImageJob#
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* @private
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*/
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this.errorMsg = null;
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};
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$.ImageJob.prototype = {
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/**
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* Starts the image job.
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* @method
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*/
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start: function() {
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var self = this;
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var selfAbort = this.abort;
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this.jobId = window.setTimeout(function () {
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self.finish(null, null, "Image load exceeded timeout (" + self.timeout + " ms)");
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}, this.timeout);
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this.abort = function() {
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self.source.downloadTileAbort(self);
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if (typeof selfAbort === "function") {
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selfAbort();
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}
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};
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this.source.downloadTileStart(this);
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},
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/**
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* Finish this job.
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* @param {*} data data that has been downloaded
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* @param {XMLHttpRequest} request reference to the request if used
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* @param {string} errorMessage description upon failure
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*/
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finish: function(data, request, errorMessage ) {
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this.data = data;
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this.request = request;
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this.errorMsg = errorMessage;
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if (this.jobId) {
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window.clearTimeout(this.jobId);
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}
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this.callback(this);
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}
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};
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/**
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* @class ImageLoader
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* @memberof OpenSeadragon
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* @classdesc Handles downloading of a set of images using asynchronous queue pattern.
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* You generally won't have to interact with the ImageLoader directly.
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* @param {Object} options - Options for this ImageLoader.
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* @param {Number} [options.jobLimit] - The number of concurrent image requests. See imageLoaderLimit in {@link OpenSeadragon.Options} for details.
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* @param {Number} [options.timeout] - The max number of milliseconds that an image job may take to complete.
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*/
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$.ImageLoader = function(options) {
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$.extend(true, this, {
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jobLimit: $.DEFAULT_SETTINGS.imageLoaderLimit,
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timeout: $.DEFAULT_SETTINGS.timeout,
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jobQueue: [],
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jobsInProgress: 0
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}, options);
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};
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/** @lends OpenSeadragon.ImageLoader.prototype */
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$.ImageLoader.prototype = {
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/**
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* Add an unloaded image to the loader queue.
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* @method
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* @param {Object} options - Options for this job.
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* @param {String} [options.src] - URL of image to download.
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* @param {Tile} [options.tile] - Tile that belongs the data to. The tile instance
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* is not internally used and serves for custom TileSources implementations.
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* @param {TileSource} [options.source] - Image loading strategy
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* @param {String} [options.loadWithAjax] - Whether to load this image with AJAX.
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* @param {String} [options.ajaxHeaders] - Headers to add to the image request if using AJAX.
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* @param {String|Boolean} [options.crossOriginPolicy] - CORS policy to use for downloads
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* @param {String} [options.postData] - POST parameters (usually but not necessarily in k=v&k2=v2... form,
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* see TileSource::getPostData) or null
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* @param {Boolean} [options.ajaxWithCredentials] - Whether to set withCredentials on AJAX
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* requests.
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* @param {Function} [options.callback] - Called once image has been downloaded.
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* @param {Function} [options.abort] - Called when this image job is aborted.
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*/
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addJob: function(options) {
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if (!options.source) {
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$.console.error('ImageLoader.prototype.addJob() requires [options.source]. ' +
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'TileSource since new API defines how images are fetched. Creating a dummy TileSource.');
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var implementation = $.TileSource.prototype;
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options.source = {
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downloadTileStart: implementation.downloadTileStart,
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downloadTileAbort: implementation.downloadTileAbort
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};
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}
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var _this = this,
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complete = function(job) {
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completeJob(_this, job, options.callback);
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},
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jobOptions = {
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src: options.src,
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tile: options.tile || {},
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source: options.source,
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loadWithAjax: options.loadWithAjax,
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ajaxHeaders: options.loadWithAjax ? options.ajaxHeaders : null,
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crossOriginPolicy: options.crossOriginPolicy,
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ajaxWithCredentials: options.ajaxWithCredentials,
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postData: options.postData,
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callback: complete,
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abort: options.abort,
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timeout: this.timeout
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},
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newJob = new $.ImageJob(jobOptions);
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if ( !this.jobLimit || this.jobsInProgress < this.jobLimit ) {
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newJob.start();
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this.jobsInProgress++;
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}
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else {
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this.jobQueue.push( newJob );
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}
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},
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/**
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* Clear any unstarted image loading jobs from the queue.
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* @method
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*/
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clear: function() {
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for( var i = 0; i < this.jobQueue.length; i++ ) {
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var job = this.jobQueue[i];
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if ( typeof job.abort === "function" ) {
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job.abort();
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}
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}
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this.jobQueue = [];
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}
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};
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/**
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* Cleans up ImageJob once completed.
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* @method
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* @private
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* @param loader - ImageLoader used to start job.
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* @param job - The ImageJob that has completed.
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* @param callback - Called once cleanup is finished.
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*/
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function completeJob(loader, job, callback) {
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var nextJob;
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loader.jobsInProgress--;
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if ((!loader.jobLimit || loader.jobsInProgress < loader.jobLimit) && loader.jobQueue.length > 0) {
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nextJob = loader.jobQueue.shift();
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nextJob.start();
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loader.jobsInProgress++;
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}
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callback(job.data, job.errorMsg, job.request);
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}
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}(OpenSeadragon));
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