зеркало из https://github.com/mozilla/gecko-dev.git
135 строки
3.9 KiB
JavaScript
135 строки
3.9 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
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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let Cu = Components.utils;
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let Ci = Components.interfaces;
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let Cc = Components.classes;
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Cu.import("resource://gre/modules/XPCOMUtils.jsm");
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Cu.import("resource://gre/modules/Services.jsm");
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const STORAGE_MAX_EVENTS = 200;
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var EXPORTED_SYMBOLS = ["ConsoleAPIStorage"];
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var _consoleStorage = {};
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/**
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* The ConsoleAPIStorage is meant to cache window.console API calls for later
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* reuse by other components when needed. For example, the Web Console code can
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* display the cached messages when it opens for the active tab.
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*
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* ConsoleAPI messages are stored as they come from the ConsoleAPI code, with
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* all their properties. They are kept around until the inner window object that
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* created the messages is destroyed. Messages are indexed by the inner window
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* ID.
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*
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* Usage:
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* Cu.import("resource://gre/modules/ConsoleAPIStorage.jsm");
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*
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* // Get the cached events array for the window you want (use the inner
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* // window ID).
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* let events = ConsoleAPIStorage.getEvents(innerWindowID);
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* events.forEach(function(event) { ... });
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*
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* // Clear the events for the given inner window ID.
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* ConsoleAPIStorage.clearEvents(innerWindowID);
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*/
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var ConsoleAPIStorage = {
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QueryInterface: XPCOMUtils.generateQI([Ci.nsIObserver]),
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/** @private */
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observe: function CS_observe(aSubject, aTopic, aData)
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{
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if (aTopic == "xpcom-shutdown") {
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Services.obs.removeObserver(this, "xpcom-shutdown");
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Services.obs.removeObserver(this, "inner-window-destroyed");
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Services.obs.removeObserver(this, "memory-pressure");
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delete _consoleStorage;
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}
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else if (aTopic == "inner-window-destroyed") {
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let innerWindowID = aSubject.QueryInterface(Ci.nsISupportsPRUint64).data;
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this.clearEvents(innerWindowID);
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}
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else if (aTopic == "memory-pressure") {
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if (aData == "low-memory") {
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this.clearEvents();
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}
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}
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},
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/** @private */
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init: function CS_init()
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{
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Services.obs.addObserver(this, "xpcom-shutdown", false);
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Services.obs.addObserver(this, "inner-window-destroyed", false);
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Services.obs.addObserver(this, "memory-pressure", false);
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},
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/**
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* Get the events array by inner window ID.
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*
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* @param string aId
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* The inner window ID for which you want to get the array of cached
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* events.
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* @returns array
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* The array of cached events for the given window.
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*/
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getEvents: function CS_getEvents(aId)
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{
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return (_consoleStorage[aId] || []).slice(0);
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},
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/**
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* Record an event associated with the given window ID.
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*
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* @param string aWindowID
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* The ID of the inner window for which the event occurred.
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* @param object aEvent
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* A JavaScript object you want to store.
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*/
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recordEvent: function CS_recordEvent(aWindowID, aEvent)
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{
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let ID = parseInt(aWindowID);
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if (isNaN(ID)) {
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throw new Error("Invalid window ID argument");
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}
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if (!_consoleStorage[ID]) {
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_consoleStorage[ID] = [];
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}
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let storage = _consoleStorage[ID];
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storage.push(aEvent);
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// truncate
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if (storage.length > STORAGE_MAX_EVENTS) {
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storage.shift();
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}
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Services.obs.notifyObservers(aEvent, "console-storage-cache-event", ID);
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},
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/**
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* Clear storage data for the given window.
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*
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* @param string [aId]
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* Optional, the inner window ID for which you want to clear the
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* messages. If this is not specified all of the cached messages are
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* cleared, from all window objects.
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*/
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clearEvents: function CS_clearEvents(aId)
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{
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if (aId != null) {
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delete _consoleStorage[aId];
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}
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else {
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_consoleStorage = {};
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Services.obs.notifyObservers(null, "console-storage-reset", null);
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}
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},
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};
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ConsoleAPIStorage.init();
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