105 lines
3.2 KiB
JavaScript
105 lines
3.2 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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"use strict";
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const Cc = Components.classes;
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const Ci = Components.interfaces;
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const Cu = Components.utils;
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Cu.import("resource://gre/modules/XPCOMUtils.jsm");
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XPCOMUtils.defineLazyModuleGetter(this, "FreeSpaceWatcher",
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"resource://gre/modules/FreeSpaceWatcher.jsm");
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this.EXPORTED_SYMBOLS = ["AppDownloadManager"];
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function debug(aMsg) {
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//dump("-*-*- AppDownloadManager.jsm : " + aMsg + "\n");
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}
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this.AppDownloadManager = {
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// Minimum disk free space we want to keep, in bytes.
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// Keep synchronized with Webapps.jsm
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MIN_REMAINING_FREESPACE: 5 * 1024 * 1024,
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downloads: {},
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count: 0,
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cancelFunc: null,
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timer: null,
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/**
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* Registers the function called when we need to cancel a download.
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* The function will be called with a single parameter being the
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* manifest URL.
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*/
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registerCancelFunction: function app_dlMgr_registerCancel(aFunction) {
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this.cancelFunc = aFunction;
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},
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/**
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* Adds a download to the list of current downloads.
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* @param aManifestURL The manifest URL for the application being downloaded.
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* @param aDownload An opaque object representing the download.
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*/
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add: function app_dlMgr_add(aManifestURL, aDownload) {
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debug("Adding " + aManifestURL);
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if (!(aManifestURL in this.downloads)) {
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this.count++;
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if (this.count == 1) {
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this.timer = FreeSpaceWatcher.create(this.MIN_REMAINING_FREESPACE,
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this._spaceWatcher.bind(this));
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}
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}
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this.downloads[aManifestURL] = aDownload;
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},
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/**
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* Retrieves a download from the list of current downloads.
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* @param aManifestURL The manifest URL for the application being retrieved.
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* @return The opaque object representing the download.
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*/
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get: function app_dlMgr_get(aManifestURL) {
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debug("Getting " + aManifestURL);
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if (!this.downloads[aManifestURL]) {
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return null;
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}
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return this.downloads[aManifestURL];
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},
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/**
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* Removes a download of the list of current downloads.
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* @param aManifestURL The manifest URL for the application being removed.
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*/
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remove: function app_dlMgr_remove(aManifestURL) {
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debug("Removing " + aManifestURL);
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if (aManifestURL in this.downloads) {
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this.count--;
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delete this.downloads[aManifestURL];
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if (this.count == 0) {
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FreeSpaceWatcher.stop(this.timer);
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}
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}
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},
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/**
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* Callback for the free space watcher. This will call cancel on downloads
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* if needed.
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*/
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_spaceWatcher: function app_dlMgr_watcher(aStatus) {
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debug("Disk space is now " + aStatus);
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if (aStatus == "free") {
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// Nothing to do.
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return;
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}
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// We cancel all downloads, because we don't know which ones we could
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// keep running. We can improve that later if we have better heuristics,
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// or when we'll support pause & resume we should just pause downloads.
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for (let url in this.downloads) {
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this.cancelFunc(url, "INSUFFICIENT_STORAGE");
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}
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}
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}
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