dbus example added

vala/live.gnome.org_tutorial/dbus-client.sh

@@ -0,0 +1,12 @@
+#!/bin/sh
+
+dbus-send --type=method_call                   \
+            --dest=org.example.DemoService       \
+            /org/example/demo                    \
+            org.example.DemoService.SomeMethod
+
+dbus-send --type=method_call                   \
+            --dest=org.example.DemoService       \
+            /org/example/demo                    \
+            org.example.DemoService.SomeMethodSender \
+            string:'hello world'

vala/live.gnome.org_tutorial/dbus-demo-service.vala

@@ -0,0 +1,54 @@
+[DBus(name = "org.example.DemoService")]
+public class DemoService : Object {
+    /* Private field, not exported via D-Bus */
+    int counter;
+
+    /* Public field, not exported via D-Bus */
+    public int status;
+
+    /* Public property, exported via D-Bus */
+    public int something { get; set; }
+
+    /* Public signal, exported via D-Bus
+     * Can be emitted on the server side and can be connected to on the client side.
+     */
+    public signal void sig1();
+
+    /* Public method, exported via D-Bus */
+    public void some_method() {
+        counter++;
+        stdout.printf("heureka! counter = %d\n", counter);
+        sig1();  // emit signal
+    }
+
+    /* Public method, exported via D-Bus and showing the sender who is
+       is calling the method (not exported in the D-Bus inteface) */
+    public void some_method_sender(string message, GLib.BusName sender) {
+        counter++;
+        stdout.printf("heureka! counter = %d, '%s' message from sender %s\n",
+                      counter, message, sender);
+    }
+}
+
+void on_bus_aquired (DBusConnection conn) {
+    try {
+        // start service and register it as dbus object
+        var service = new DemoService();
+        conn.register_object ("/org/example/demo", service);
+    } catch (IOError e) {
+        stderr.printf ("Could not register service: %s\n", e.message);
+    }
+}
+
+void main () {
+    // try to register service name in session bus
+    Bus.own_name (BusType.SESSION, "org.example.DemoService", /* name to register */
+                  BusNameOwnerFlags.NONE, /* flags */
+                  on_bus_aquired, /* callback function on registration succeded */
+                  () => {}, /* callback on name register succeded */
+                  () => stderr.printf ("Could not aquire name\n"));
+                                                     /* callback on name lost */
+
+    // start main loop
+    new MainLoop ().run ();
+}

vala/live.gnome.org_tutorial/run.sh

@@ -1,10 +1,8 @@
 #!/bin/sh
 
-# valac --thread --target-glib=2.32 threading-sample.vala \
 valac --thread threads.vala
 valac --thread --target-glib=2.32 threads-2.32.vala
 valac --thread philosophers.vala
 valac --thread async-queue-test.vala
 
-
-
+valac --pkg gio-2.0 dbus-demo-service.vala