From 5d753a34dcb898d1572f527a95b7ec9b58be1803 Mon Sep 17 00:00:00 2001
From: Charles Kerr <charles.kerr@canonical.com>
Date: Sat, 13 Sep 2014 13:12:04 -0500
Subject: hide Clock's implementation details into an Impl class.

---
 src/clock.cpp | 138 +++++++++++++++++++++++++++++++++++++++++-----------------
 1 file changed, 97 insertions(+), 41 deletions(-)

(limited to 'src/clock.cpp')

diff --git a/src/clock.cpp b/src/clock.cpp
index f41a0cc..748174b 100644
--- a/src/clock.cpp
+++ b/src/clock.cpp
@@ -22,6 +22,11 @@
 #include <glib.h>
 #include <gio/gio.h>
 
+#include <map>
+#include <set>
+#include <string>
+#include <vector>
+
 namespace unity {
 namespace indicator {
 namespace datetime {
@@ -30,58 +35,109 @@ namespace datetime {
 ****
 ***/
 
-Clock::Clock():
-    m_cancellable(g_cancellable_new())
+class Clock::Impl
 {
-    g_bus_get(G_BUS_TYPE_SYSTEM, m_cancellable, on_system_bus_ready, this);
-}
+public:
 
-Clock::~Clock()
-{
-    g_cancellable_cancel(m_cancellable);
-    g_clear_object(&m_cancellable);
+    Impl(Clock& owner):
+        m_owner(owner)
+    {
+        auto tag = g_bus_watch_name(G_BUS_TYPE_SYSTEM,
+                                    "org.freedesktop.login1",
+                                    G_BUS_NAME_WATCHER_FLAGS_NONE,
+                                    on_login1_appeared,
+                                    on_login1_vanished,
+                                    this, nullptr);
+        m_watched_names.insert(tag);
+    }
 
-    if (m_sleep_subscription_id)
-        g_dbus_connection_signal_unsubscribe(m_system_bus, m_sleep_subscription_id);
 
-    g_clear_object(&m_system_bus);
-}
+    ~Impl()
+    {
+        for(const auto& tag : m_watched_names)
+            g_bus_unwatch_name(tag);
+    }
 
-void
-Clock::on_system_bus_ready(GObject*, GAsyncResult * res, gpointer gself)
-{
-    GDBusConnection * system_bus;
+private:
+
+    void remember_subscription(const std::string& name,
+                               GDBusConnection* bus,
+                               guint tag)
+    {
+        auto subscription = std::shared_ptr<GDBusConnection>(
+              G_DBUS_CONNECTION(g_object_ref(bus)),
+              [tag](GDBusConnection* bus){
+                  g_dbus_connection_signal_unsubscribe(bus, tag);
+                  g_object_unref(G_OBJECT(bus));
+              }
+        );
 
-    if ((system_bus = g_bus_get_finish(res, nullptr)))
+        m_subscriptions[name].push_back(subscription);
+    }
+
+    /**
+    ***  DBus Chatter: org.freedesktop.login1
+    ***
+    ***  Fire Clock::minute_changed() signal on login1's PrepareForSleep signal
+    **/
+
+    static void on_login1_appeared(GDBusConnection * bus,
+                                   const gchar     * name,
+                                   const gchar     * name_owner,
+                                   gpointer          gself)
     {
-        auto self = static_cast<Clock*>(gself);
-
-        self->m_system_bus = system_bus;
-
-        self->m_sleep_subscription_id = g_dbus_connection_signal_subscribe(
-                        system_bus,
-                        nullptr,
-                        "org.freedesktop.login1.Manager", // interface
-                        "PrepareForSleep", // signal name
-                        "/org/freedesktop/login1", // object path
-                        nullptr, // arg0
-                        G_DBUS_SIGNAL_FLAGS_NONE,
-                        on_prepare_for_sleep,
-                        self,
-                        nullptr);
+        auto tag = g_dbus_connection_signal_subscribe(bus,
+                                                      name_owner,
+                                                      "org.freedesktop.login1.Manager", // interface
+                                                      "PrepareForSleep", // signal name
+                                                      "/org/freedesktop/login1", // object path
+                                                      nullptr, // arg0
+                                                      G_DBUS_SIGNAL_FLAGS_NONE,
+                                                      on_prepare_for_sleep,
+                                                      gself,
+                                                      nullptr);
+
+        static_cast<Impl*>(gself)->remember_subscription(name, bus, tag);
     }
+
+    static void on_login1_vanished(GDBusConnection * /*system_bus*/,
+                                   const gchar     * name,
+                                   gpointer          gself)
+    {
+      static_cast<Impl*>(gself)->m_subscriptions[name].clear();
+    }
+
+    static void on_prepare_for_sleep(GDBusConnection* /*connection*/,
+                                     const gchar*     /*sender_name*/,
+                                     const gchar*     /*object_path*/,
+                                     const gchar*     /*interface_name*/,
+                                     const gchar*     /*signal_name*/,
+                                     GVariant*        /*parameters*/,
+                                     gpointer           gself)
+    {
+        static_cast<Impl*>(gself)->m_owner.minute_changed();
+    }
+
+    /***
+    ****
+    ***/
+
+    Clock& m_owner;
+    std::set<guint> m_watched_names;
+    std::map<std::string,std::vector<std::shared_ptr<GDBusConnection>>> m_subscriptions;
+};
+
+/***
+****
+***/
+
+Clock::Clock():
+   m_impl(new Impl{*this})
+{
 }
 
-void
-Clock::on_prepare_for_sleep(GDBusConnection* /*connection*/,
-                            const gchar*     /*sender_name*/,
-                            const gchar*     /*object_path*/,
-                            const gchar*     /*interface_name*/,
-                            const gchar*     /*signal_name*/,
-                            GVariant*        /*parameters*/,
-                            gpointer           gself)
+Clock::~Clock()
 {
-    static_cast<Clock*>(gself)->minute_changed();
 }
 
 /***
-- 
cgit v1.2.3