mirror of
https://github.com/classilla/tenfourfox.git
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119 lines
4.1 KiB
JavaScript
119 lines
4.1 KiB
JavaScript
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/* 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/Services.jsm");
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Cu.import("resource://gre/modules/FileUtils.jsm");
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this.EXPORTED_SYMBOLS = ["FreeSpaceWatcher"];
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function debug(aMsg) {
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//dump("-*-*- FreeSpaceWatcher.jsm : " + aMsg + "\n");
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}
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// Polling delay for free space, in ms.
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const DEFAULT_WATCHER_DELAY = 1000;
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this.FreeSpaceWatcher = {
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timers: {},
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id: 0,
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/**
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* This function will call aOnStatusChange
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* each time the free space for apps crosses aThreshold, checking
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* every aDelay milliseconds, or every second by default.
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* aOnStatusChange is called with either "free" or "full" and will
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* always be called at least one to get the initial status.
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* @param aThreshold The amount of space in bytes to watch for.
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* @param aOnStatusChange The function called when the state changes.
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* @param aDelay How often (in ms) we check free space. Defaults
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* to DEFAULT_WATCHER_DELAY.
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* @return An opaque value to use with stop().
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*/
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create: function spaceWatcher_create(aThreshold, aOnStatusChange, aDelay) {
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let timer = Cc["@mozilla.org/timer;1"].createInstance(Ci.nsITimer);
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debug("Creating new FreeSpaceWatcher");
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let callback = {
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currentStatus: null,
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notify: function(aTimer) {
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try {
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let checkFreeSpace = function (freeBytes) {
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debug("Free bytes: " + freeBytes);
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let newStatus = freeBytes > aThreshold;
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if (newStatus != callback.currentStatus) {
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debug("New status: " + (newStatus ? "free" : "full"));
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aOnStatusChange(newStatus ? "free" : "full");
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callback.currentStatus = newStatus;
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}
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};
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let navigator = Services.wm.getMostRecentWindow("navigator:browser")
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.navigator;
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let deviceStorage = null;
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if (navigator.getDeviceStorage) {
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deviceStorage = navigator.getDeviceStorage("apps");
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}
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if (deviceStorage) {
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let req = deviceStorage.freeSpace();
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req.onsuccess = req.onerror = function statResult(e) {
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if (!e.target.result) {
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return;
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}
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let freeBytes = e.target.result;
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checkFreeSpace(freeBytes);
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}
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} else {
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// deviceStorage isn't available, so use the webappsDir instead.
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// This needs to be moved from a hardcoded string to DIRECTORY_NAME
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// in AppsUtils. See bug 852685.
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let dir = FileUtils.getDir("webappsDir", ["webapps"], true, true);
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let freeBytes;
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try {
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freeBytes = dir.diskSpaceAvailable;
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} catch(e) {
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// If disk space information isn't available, we should assume
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// that there is enough free space, and that we'll fail when
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// we actually run out of disk space.
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callback.currentStatus = true;
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}
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if (freeBytes) {
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// We have disk space information. Call this here so that
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// any exceptions are caught in the outer catch block.
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checkFreeSpace(freeBytes);
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}
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}
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} catch(e) {
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// If the aOnStatusChange callback has errored we'll end up here.
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debug(e);
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}
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}
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}
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timer.initWithCallback(callback, aDelay || DEFAULT_WATCHER_DELAY,
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Ci.nsITimer.TYPE_REPEATING_SLACK);
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let id = "timer-" + this.id++;
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this.timers[id] = timer;
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return id;
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},
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/**
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* This function stops a running watcher.
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* @param aId The opaque timer id returned by create().
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*/
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stop: function spaceWatcher_stop(aId) {
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if (this.timers[aId]) {
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this.timers[aId].cancel();
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delete this.timers[aId];
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}
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}
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}
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