libs/ardour/session_handle.cc

   1 /*
   2     Copyright (C) 2009 Paul Davis
   3
   4     This program is free software; you can redistribute it and/or modify
   5     it under the terms of the GNU General Public License as published by
   6     the Free Software Foundation; either version 2 of the License, or
   7     (at your option) any later version.
   8
   9     This program is distributed in the hope that it will be useful,
  10     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12     GNU General Public License for more details.
  13
  14     You should have received a copy of the GNU General Public License
  15     along with this program; if not, write to the Free Software
  16     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17
  18 */
  19
  20 #include "pbd/demangle.h"
  21 #include "pbd/error.h"
  22 #include "pbd/boost_debug.h"
  23
  24 #include "ardour/session.h"
  25 #include "ardour/session_handle.h"
  26
  27 #include "i18n.h"
  28
  29 using namespace std;
  30 using namespace ARDOUR;
  31 using namespace PBD;
  32
  33 SessionHandlePtr::SessionHandlePtr (Session* s)
  34         : _session (s)
  35 {
  36         if (_session) {
  37                 _session->DropReferences.connect_same_thread (_session_connections, boost::bind (&SessionHandlePtr::session_going_away, this));
  38         }
  39 }
  40
  41 void
  42 SessionHandlePtr::set_session (Session* s)
  43 {
  44         _session_connections.drop_connections ();
  45
  46         if (_session) {
  47                 _session = 0;
  48         }
  49
  50         if (s) {
  51                 _session = s;
  52                 _session->DropReferences.connect_same_thread (_session_connections, boost::bind (&SessionHandlePtr::session_going_away, this));
  53         }
  54 }
  55
  56 void
  57 SessionHandlePtr::session_going_away ()
  58 {
  59         set_session (0);
  60 }
  61
  62 /*-------------------------*/
  63
  64
  65 SessionHandleRef::SessionHandleRef (Session& s)
  66         : _session (s)
  67 {
  68         _session.DropReferences.connect_same_thread (*this, boost::bind (&SessionHandleRef::session_going_away, this));
  69         _session.Destroyed.connect_same_thread (*this, boost::bind (&SessionHandleRef::insanity_check, this));
  70 }
  71
  72 SessionHandleRef::~SessionHandleRef ()
  73 {
  74 }
  75
  76 void
  77 SessionHandleRef::session_going_away ()
  78 {
  79         /* a handleRef is allowed to exist at the time of DropReferences, but not at the time of Destroyed
  80          */
  81 }
  82
  83 void
  84 SessionHandleRef::insanity_check ()
  85 {
  86         cerr << string_compose (
  87                 _("programming error: %1"),
  88                 string_compose("SessionHandleRef exists across sesssion deletion! Dynamic type: %1",
  89                                PBD::demangled_name (*this)))
  90              << endl;
  91 }