mirror of
https://github.com/gorhill/uBlock.git
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150 lines
4.1 KiB
JavaScript
150 lines
4.1 KiB
JavaScript
/*******************************************************************************
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µBlock - a Chromium browser extension to block requests.
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Copyright (C) 2014 Raymond Hill
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see {http://www.gnu.org/licenses/}.
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Home: https://github.com/gorhill/uBlock
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*/
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/* global chrome, µBlock */
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/******************************************************************************/
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// Async job queue module
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µBlock.asyncJobs = (function() {
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var processJobs = function() {
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asyncJobManager.process();
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};
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var AsyncJobEntry = function(name) {
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this.name = name;
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this.data = null;
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this.callback = null;
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this.when = 0;
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this.period = 0;
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};
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AsyncJobEntry.prototype.destroy = function() {
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this.name = '';
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this.data = null;
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this.callback = null;
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};
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var AsyncJobManager = function() {
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this.timeResolution = 200;
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this.jobs = {};
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this.jobCount = 0;
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this.jobJunkyard = [];
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this.timerId = null;
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this.timerWhen = Number.MAX_VALUE;
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};
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AsyncJobManager.prototype.restartTimer = function() {
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var when = Number.MAX_VALUE;
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var jobs = this.jobs, job;
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for ( var jobName in jobs ) {
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job = jobs[jobName];
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if ( job instanceof AsyncJobEntry ) {
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if ( job.when < when ) {
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when = job.when;
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}
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}
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}
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// Quantize time value
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when = Math.floor((when + this.timeResolution - 1) / this.timeResolution) * this.timeResolution;
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if ( when < this.timerWhen ) {
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clearTimeout(this.timerId);
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this.timerWhen = when;
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this.timerId = setTimeout(processJobs, Math.max(when - Date.now(), 10));
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}
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};
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AsyncJobManager.prototype.add = function(name, data, callback, delay, recurrent) {
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var job = this.jobs[name];
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if ( !job ) {
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job = this.jobJunkyard.pop();
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if ( !job ) {
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job = new AsyncJobEntry(name);
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} else {
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job.name = name;
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}
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this.jobs[name] = job;
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this.jobCount++;
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}
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job.data = data;
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job.callback = callback;
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job.when = Date.now() + delay;
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job.period = recurrent ? delay : 0;
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this.restartTimer();
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};
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AsyncJobManager.prototype.process = function() {
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this.timerId = null;
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this.timerWhen = Number.MAX_VALUE;
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var now = Date.now();
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var job;
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for ( var jobName in this.jobs ) {
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if ( this.jobs.hasOwnProperty(jobName) === false ) {
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continue;
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}
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job = this.jobs[jobName];
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if ( job.when > now ) {
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continue;
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}
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job.callback(job.data);
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if ( job.period ) {
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job.when = now + job.period;
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} else {
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delete this.jobs[jobName];
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job.destroy();
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this.jobCount--;
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this.jobJunkyard.push(job);
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}
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}
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this.restartTimer();
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};
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// Only one instance
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var asyncJobManager = new AsyncJobManager();
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// Publish
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return asyncJobManager;
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})();
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/******************************************************************************/
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// Update visual of extension icon.
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// A time out is used to coalesce adjacent requests to update badge.
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µBlock.updateBadge = function(tabId) {
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if ( tabId < 0 ) {
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return;
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}
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var updateBadgeCallback = function(tabId) {
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var pageStore = µBlock.pageStoreFromTabId(tabId);
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if ( pageStore ) {
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pageStore.updateBadge();
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} else {
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chrome.browserAction.setIcon({ tabId: tabId, path: 'img/browsericons/icon19-off.png' });
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}
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};
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this.asyncJobs.add('updateBadge-' + tabId, tabId, updateBadgeCallback, 200);
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};
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