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// This file is part of the AppIndicator/KStatusNotifierItem GNOME Shell extension
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
const GLib = imports.gi.GLib
const Gio = imports.gi.Gio
const Util = imports.misc.extensionUtils.getCurrentExtension().imports.util;
// The icon cache caches icon objects in case they're reused shortly aftwerwards.
// This is necessary for some indicators like skype which rapidly switch between serveral icons.
// Without caching, the garbage collection would never be able to handle the amount of new icon data.
// If the lifetime of an icon is over, the cache will destroy the icon. (!)
// The presence of an inUse property set to true on the icon will extend the lifetime.
const GC_INTERVAL = 60; // seconds
const LIFETIME_TIMESPAN = 10; // seconds
// how to use: see IconCache.add, IconCache.get
var IconCache = class AppIndicators_IconCache {
constructor() {
this._cache = new Map();
this._lifetime = new Map(); //we don't want to attach lifetime to the object
}
add(id, icon) {
if (!(icon instanceof Gio.Icon)) {
Util.Logger.critical('IconCache: Only Gio.Icons are supported');
return null;
}
if (!id) {
Util.Logger.critical('IconCache: Invalid ID provided');
return null;
}
let oldIcon = this._cache.get(id);
if (!oldIcon || !oldIcon.equals(icon)) {
Util.Logger.debug(`IconCache: adding ${id}: ${icon}`);
this._cache.set(id, icon);
} else {
icon = oldIcon;
}
this._renewLifetime(id);
this._checkGC();
return icon;
}
_remove(id) {
Util.Logger.debug(`IconCache: removing ${id}`);
this._cache.get(id).run_dispose();
this._cache.delete(id);
this._lifetime.delete(id);
}
_renewLifetime(id) {
this._lifetime.set(id, new Date().getTime() + LIFETIME_TIMESPAN * 1000);
}
forceDestroy(id) {
if (this._cache.has(id)) {
this._remove(id);
this._checkGC();
}
}
// marks all the icons as removable, if something doesn't claim them before
weakClear() {
this._cache.forEach((icon) => icon.inUse = false);
this._checkGC();
}
// removes everything from the cache
clear() {
this._cache.forEach((_icon, id) => this._remove(id));
this._checkGC();
}
// returns an object from the cache, or null if it can't be found.
get(id) {
let icon = this._cache.get(id);
if (icon) {
Util.Logger.debug(`IconCache: retrieving ${id}: ${icon}`);
this._renewLifetime(id);
return icon;
}
return null;
}
_checkGC() {
let cacheIsEmpty = this._cache.size == 0;
if (!cacheIsEmpty && !this._gcTimeout) {
Util.Logger.debug("IconCache: garbage collector started");
this._gcTimeout = GLib.timeout_add_seconds(
GLib.PRIORITY_LOW,
GC_INTERVAL,
() => this._gc());
} else if (cacheIsEmpty && this._gcTimeout) {
Util.Logger.debug("IconCache: garbage collector stopped");
GLib.Source.remove(this._gcTimeout);
delete this._gcTimeout;
}
}
_gc() {
let time = new Date().getTime();
this._cache.forEach((icon, id) => {
if (icon.inUse) {
Util.Logger.debug(`IconCache: ${id} is in use.`);
} else if (this._lifetime.get(id) < time) {
this._remove(id);
} else {
Util.Logger.debug(`IconCache: ${id} survived this round.`);
}
});
return true;
}
destroy() {
this.clear();
}
};
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