[folks] Add DisconnectionQueue, which disconnects signals semi-automatically

[Philip Withnall <pwithnall src gnome org>]

commit 956c1d2aea563e6ef8cacafbb1edebb8b8ec7d7f
Author: Simon McVittie <simon mcvittie collabora co uk>
Date:   Tue Mar 19 17:59:14 2013 +0000

    Add DisconnectionQueue, which disconnects signals semi-automatically

 tests/lib/Makefile.am              |    1 +
 tests/lib/disconnection-queue.vala |   70 ++++++++++++++++++++++++++++++++++++
 2 files changed, 71 insertions(+), 0 deletions(-)
---
diff --git a/tests/lib/Makefile.am b/tests/lib/Makefile.am
index e080949..23b2707 100644
--- a/tests/lib/Makefile.am
+++ b/tests/lib/Makefile.am
@@ -37,6 +37,7 @@ DIST_SUBDIRS = \
 noinst_LTLIBRARIES = libfolks-test.la
 
 libfolks_test_la_SOURCES = \
+       disconnection-queue.vala \
        haze-remove-directory.c \
        test-case.vala \
        test-case-helper.c \
diff --git a/tests/lib/disconnection-queue.vala b/tests/lib/disconnection-queue.vala
new file mode 100644
index 0000000..9ecafc5
--- /dev/null
+++ b/tests/lib/disconnection-queue.vala
@@ -0,0 +1,70 @@
+/* disconnection-queue.vala - disconnect signals automagically
+ *
+ * Copyright © 2013 Intel Corporation
+ *
+ * This library 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 library 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
+ * Lesser General Public License for more details.
+
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
+ *
+ * Author:
+ *      Simon McVittie <simon mcvittie collabora co uk>
+ */
+
+public class Folks.DisconnectionQueue : Object
+{
+  [Compact]
+  private class _Connection
+    {
+      internal weak Object obj;
+      internal ulong id;
+
+      internal _Connection (Object obj, ulong id)
+        {
+          this.obj = obj;
+          this.id = id;
+        }
+    }
+
+  private GenericArray<_Connection> _conns;
+
+  public DisconnectionQueue ()
+    {
+      this._conns = new GenericArray<_Connection> ();
+    }
+
+  public void push (Object obj, ulong id)
+    {
+      return_if_fail (id != 0);
+
+      this._conns.add (new _Connection (obj, id));
+    }
+
+  public void drain ()
+    {
+      var conns = this._conns;
+      this._conns = new GenericArray<_Connection> ();
+
+      for (uint i = 1; i <= conns.length; i++)
+        {
+          unowned _Connection conn = conns[conns.length - i];
+
+          if (conn.obj != null && conn.id != 0)
+            ((!) conn.obj).disconnect (conn.id);
+        }
+    }
+
+  ~DisconnectionQueue ()
+    {
+      this.drain ();
+    }
+}