[gnome-boxes] machine: Add schedule_autosave()

[Zeeshan Ali Khattak <zeeshanak src gnome org>]

commit 0461fd35cca2841fa836713da480edecb84b9468
Author: Zeeshan Ali (Khattak) <zeeshanak gnome org>
Date:   Tue Nov 11 20:48:28 2014 +0000

    machine: Add schedule_autosave()
    
    Add a method to autosave the machine after 1 minute.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=694931

 src/machine.vala |   22 ++++++++++++++++++++++
 1 files changed, 22 insertions(+), 0 deletions(-)
---
diff --git a/src/machine.vala b/src/machine.vala
index e419ca0..d8ba8b1 100644
--- a/src/machine.vala
+++ b/src/machine.vala
@@ -3,6 +3,8 @@ using Gdk;
 using Gtk;
 
 private abstract class Boxes.Machine: Boxes.CollectionItem, Boxes.IPropertiesProvider {
+    const uint AUTOSAVE_TIMEOUT = 60; // seconds
+
     public Boxes.CollectionSource source;
     public Boxes.BoxConfig config;
     public Gdk.Pixbuf? pixbuf { get; set; }
@@ -252,6 +254,18 @@ private abstract class Boxes.Machine: Boxes.CollectionItem, Boxes.IPropertiesPro
         this.info = info;
     }
 
+    public void schedule_autosave () {
+        if (!can_save)
+            return;
+
+        debug ("Scheduling autosave for '%s'", name);
+        Timeout.add_seconds (AUTOSAVE_TIMEOUT, () => {
+            try_save.begin ();
+
+            return false;
+        });
+    }
+
     protected virtual async void save_real () throws GLib.Error {
     }
 
@@ -621,4 +635,12 @@ private abstract class Boxes.Machine: Boxes.CollectionItem, Boxes.IPropertiesPro
         else
             return -1; // Machines are listed before non-machines
     }
+
+    private async void try_save () {
+        try {
+            yield save ();
+        } catch (GLib.Error error) {
+            warning ("Failed to save '%s': %s", name, error.message);
+        }
+    }
 }