The Tor Browser / file comparison
comparison: dom/apps/src/AppDownloadManager.jsm
dom/apps/src/AppDownloadManager.jsm
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
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deleted
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| -1:000000000000 | 0:c541e43396b7 |
|---|---|
| 1 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 2 * License, v. 2.0. If a copy of the MPL was not distributed with this file, | |
| 3 * You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 4 | |
| 5 "use strict"; | |
| 6 | |
| 7 const Cc = Components.classes; | |
| 8 const Ci = Components.interfaces; | |
| 9 const Cu = Components.utils; | |
| 10 | |
| 11 Cu.import("resource://gre/modules/XPCOMUtils.jsm"); | |
| 12 | |
| 13 XPCOMUtils.defineLazyModuleGetter(this, "FreeSpaceWatcher", | |
| 14 "resource://gre/modules/FreeSpaceWatcher.jsm"); | |
| 15 | |
| 16 this.EXPORTED_SYMBOLS = ["AppDownloadManager"]; | |
| 17 | |
| 18 function debug(aMsg) { | |
| 19 //dump("-*-*- AppDownloadManager.jsm : " + aMsg + "\n"); | |
| 20 } | |
| 21 | |
| 22 this.AppDownloadManager = { | |
| 23 // Minimum disk free space we want to keep, in bytes. | |
| 24 // Keep synchronized with Webapps.jsm | |
| 25 MIN_REMAINING_FREESPACE: 5 * 1024 * 1024, | |
| 26 | |
| 27 downloads: {}, | |
| 28 count: 0, | |
| 29 cancelFunc: null, | |
| 30 timer: null, | |
| 31 | |
| 32 /** | |
| 33 * Registers the function called when we need to cancel a download. | |
| 34 * The function will be called with a single parameter being the | |
| 35 * manifest URL. | |
| 36 */ | |
| 37 registerCancelFunction: function app_dlMgr_registerCancel(aFunction) { | |
| 38 this.cancelFunc = aFunction; | |
| 39 }, | |
| 40 | |
| 41 /** | |
| 42 * Adds a download to the list of current downloads. | |
| 43 * @param aManifestURL The manifest URL for the application being downloaded. | |
| 44 * @param aDownload An opaque object representing the download. | |
| 45 */ | |
| 46 add: function app_dlMgr_add(aManifestURL, aDownload) { | |
| 47 debug("Adding " + aManifestURL); | |
| 48 if (!(aManifestURL in this.downloads)) { | |
| 49 this.count++; | |
| 50 if (this.count == 1) { | |
| 51 this.timer = FreeSpaceWatcher.create(this.MIN_REMAINING_FREESPACE, | |
| 52 this._spaceWatcher.bind(this)); | |
| 53 } | |
| 54 } | |
| 55 this.downloads[aManifestURL] = aDownload; | |
| 56 }, | |
| 57 | |
| 58 /** | |
| 59 * Retrieves a download from the list of current downloads. | |
| 60 * @param aManifestURL The manifest URL for the application being retrieved. | |
| 61 * @return The opaque object representing the download. | |
| 62 */ | |
| 63 get: function app_dlMgr_get(aManifestURL) { | |
| 64 debug("Getting " + aManifestURL); | |
| 65 if (!this.downloads[aManifestURL]) { | |
| 66 return null; | |
| 67 } | |
| 68 return this.downloads[aManifestURL]; | |
| 69 }, | |
| 70 | |
| 71 /** | |
| 72 * Removes a download of the list of current downloads. | |
| 73 * @param aManifestURL The manifest URL for the application being removed. | |
| 74 */ | |
| 75 remove: function app_dlMgr_remove(aManifestURL) { | |
| 76 debug("Removing " + aManifestURL); | |
| 77 if (aManifestURL in this.downloads) { | |
| 78 this.count--; | |
| 79 delete this.downloads[aManifestURL]; | |
| 80 if (this.count == 0) { | |
| 81 FreeSpaceWatcher.stop(this.timer); | |
| 82 } | |
| 83 } | |
| 84 }, | |
| 85 | |
| 86 /** | |
| 87 * Callback for the free space watcher. This will call cancel on downloads | |
| 88 * if needed. | |
| 89 */ | |
| 90 _spaceWatcher: function app_dlMgr_watcher(aStatus) { | |
| 91 debug("Disk space is now " + aStatus); | |
| 92 if (aStatus == "free") { | |
| 93 // Nothing to do. | |
| 94 return; | |
| 95 } | |
| 96 | |
| 97 // We cancel all downloads, because we don't know which ones we could | |
| 98 // keep running. We can improve that later if we have better heuristics, | |
| 99 // or when we'll support pause & resume we should just pause downloads. | |
| 100 for (let url in this.downloads) { | |
| 101 this.cancelFunc(url, "INSUFFICIENT_STORAGE"); | |
| 102 } | |
| 103 } | |
| 104 } |
