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gala/lib/AppCache.vala

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//
// Copyright 2020 elementary, Inc. (https://elementary.io)
//
// 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 3 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, see <http://www.gnu.org/licenses/>.
//
public class Gala.AppCache : GLib.Object {
public signal void changed ();
private const int DEFAULT_TIMEOUT_SECONDS = 3;
private GLib.HashTable<unowned string, unowned string> startup_wm_class_to_id;
private GLib.HashTable<unowned string, GLib.DesktopAppInfo> id_to_app;
private GLib.AppInfoMonitor app_info_monitor;
private uint queued_update_id = 0;
construct {
startup_wm_class_to_id = new GLib.HashTable<unowned string, unowned string> (str_hash, str_equal);
id_to_app = new GLib.HashTable<unowned string, GLib.DesktopAppInfo> (str_hash, str_equal);
app_info_monitor = GLib.AppInfoMonitor.@get ();
app_info_monitor.changed.connect (queue_cache_update);
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rebuild_cache.begin ();
}
private void queue_cache_update () {
if (queued_update_id != 0) {
GLib.Source.remove (queued_update_id);
}
queued_update_id = GLib.Timeout.add_seconds (DEFAULT_TIMEOUT_SECONDS, () => {
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rebuild_cache.begin ((obj, res) => {
rebuild_cache.end (res);
changed ();
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queued_update_id = 0;
});
return GLib.Source.REMOVE;
});
}
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private async void rebuild_cache () {
SourceFunc callback = rebuild_cache.callback;
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new Thread<void> ("rebuild_cache", () => {
lock (startup_wm_class_to_id) {
startup_wm_class_to_id.remove_all ();
id_to_app.remove_all ();
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var app_infos = GLib.AppInfo.get_all ();
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foreach (unowned GLib.AppInfo app in app_infos) {
unowned string id = app.get_id ();
unowned string? startup_wm_class = ((GLib.DesktopAppInfo)app).get_startup_wm_class ();
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id_to_app[id] = (GLib.DesktopAppInfo)app;
if (startup_wm_class == null) {
continue;
}
unowned var old_id = startup_wm_class_to_id[startup_wm_class];
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if (old_id == null || id == startup_wm_class) {
startup_wm_class_to_id[startup_wm_class] = id;
}
}
}
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Idle.add ((owned)callback);
});
yield;
}
public unowned GLib.DesktopAppInfo? lookup_id (string? id) {
if (id == null) {
return null;
}
return id_to_app[id];
}
public GLib.DesktopAppInfo? lookup_startup_wmclass (string? wm_class) {
if (wm_class == null) {
return null;
}
unowned var id = startup_wm_class_to_id[wm_class];
if (id == null) {
return null;
}
return id_to_app[id];
}
}