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/*
* Copyright © 2012 Canonical Ltd.
* By Siegfried-A. Gevatter <siegfried.gevatter@collabora.co.uk>
*
* Based upon a C implementation (© 2010-2012 Canonical Ltd) by:
* Mikkel Kamstrup Erlandsen <mikkel.kamstrup@canonical.com>
* Michal Hruby <michal.hruby@canonical.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 2.1 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 Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
/**
* FOR INTERNAL USE ONLY.
*/
namespace Zeitgeist
{
// FIXME: private or something
protected abstract class QueuedProxyWrapper : Object
{
public bool proxy_created { get; private set; default = false; }
public bool is_connected { get; private set; default = false; }
private SList<QueuedMethod> method_dispatch_queue;
private IOError? log_error;
private DBusProxy dbus_proxy;
protected class QueuedMethod
{
public SourceFunc queued_method { public get; private owned set; }
public QueuedMethod (owned SourceFunc callback)
{
queued_method = (owned) callback;
}
}
protected void proxy_acquired (Object proxy)
{
is_connected = true;
proxy_created = true;
dbus_proxy = proxy as DBusProxy;
proxy.notify["g-name-owner"].connect (name_owner_changed);
on_connection_established ();
process_queued_methods ();
}
protected void proxy_unavailable (IOError err)
{
// Zeitgeist couldn't be auto-started. We'll run the callbacks
// anyway giving them an error.
log_error = err;
process_queued_methods ();
}
protected void process_queued_methods ()
{
method_dispatch_queue.reverse ();
foreach (QueuedMethod m in method_dispatch_queue)
m.queued_method ();
method_dispatch_queue = null;
}
protected void name_owner_changed (ParamSpec pspec)
{
string? name_owner = dbus_proxy.get_name_owner ();
this.is_connected = name_owner != null;
if (this.is_connected)
on_connection_established ();
else
on_connection_lost ();
}
protected abstract void on_connection_established ();
protected abstract void on_connection_lost ();
protected async void wait_for_proxy () throws Error
{
if (likely (proxy_created))
return;
if (method_dispatch_queue == null)
method_dispatch_queue = new SList<QueuedMethod> ();
method_dispatch_queue.prepend (new QueuedMethod (wait_for_proxy.callback));
yield;
if (log_error != null)
throw log_error;
}
}
}
// vim:expandtab:ts=4:sw=4
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