battery-proxy: use DBusPropertyNotifier helper for sending property notifications

src/mconnect/battery-proxy.vala

@@ -25,6 +25,7 @@ class BatteryHandlerProxy : Object, PacketHandlerInterfaceProxy {
 	private BatteryHandler battery_handler = null;
 	private uint register_id = 0;
 	private ulong notify_id = 0;
+	private DBusPropertyNotifier prop_notifier = null;
 
 	public uint level { get; private set; default = 0; }
 	public bool charging { get; private set; default = false; }
@@ -53,9 +54,11 @@ class BatteryHandlerProxy : Object, PacketHandlerInterfaceProxy {
 		if (this.register_id == 0)
 			this.register_id = conn.register_object(path, this);
 
-		this.notify_id = this.notify.connect((spec) => {
-				this.send_property_change(conn, path, spec);
-			});
+		this.prop_notifier = new DBusPropertyNotifier(conn,
+													  "org.mconnect.Device.Battery",
+													  path);
+
+		this.notify.connect(this.send_property_change);
 	}
 
 	[DBus (visible = false)]
@@ -64,38 +67,27 @@ class BatteryHandlerProxy : Object, PacketHandlerInterfaceProxy {
 			conn.unregister_object(this.register_id);
 		this.register_id = 0;
 
-		this.disconnect(this.notify_id);
+		this.notify.disconnect(this.send_property_change);
 		this.notify_id = 0;
 	}
 
 	public signal void battery(uint level, bool charging);
 
-	private void send_property_change(DBusConnection conn, string path, ParamSpec p) {
-		var builder = new VariantBuilder (VariantType.ARRAY);
-        var invalid_builder = new VariantBuilder (new VariantType ("as"));
-
-        if (p.name == "level") {
-            Variant i = this.level;
-            builder.add ("{sv}", "level", i);
-        }
-
-        if (p.name == "charging") {
-            Variant i = this.charging;
-            builder.add ("{sv}", "charging", i);
-        }
-
-        try {
-            conn.emit_signal(null,
-							 path,
-							 "org.freedesktop.DBus.Properties",
-							 "PropertiesChanged",
-							 new Variant ("(sa{sv}as)",
-										  "org.mconnect.Device.Battery",
-										  builder,
-										  invalid_builder)
-				);
-        } catch (Error e) {
-            warning("%s\n", e.message);
-        }
+	private void send_property_change(ParamSpec p) {
+		assert(this.prop_notifier != null);
+
+		Variant v = null;
+
+		if (p.name == "level") {
+			v = this.level;
+		}
+		if (p.name == "charging") {
+			v = this.charging;
+		}
+
+		if (v == null)
+			return;
+
+		this.prop_notifier.queue_property_change(p.name, v);
 	}
 }