Work on Port destruction (still broken).

git-svn-id: http://svn.drobilla.net/lad/ingen@233 a436a847-0d15-0410-975c-d299462d15a1

16 files changed, 210 insertions, 122 deletions

diff --git a/src/libs/engine/GraphObject.cpp b/src/libs/engine/GraphObject.cpp
new file mode 100644
index 00000000..03b4eae7
--- /dev/null
+++ b/src/libs/engine/GraphObject.cpp
@@ -0,0 +1,56 @@
+/* This file is part of Ingen.  Copyright (C) 2007 Dave Robillard.
+ * 
+ * Ingen is free software; you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation; either version 2 of the License, or (at your option) any later
+ * version.
+ * 
+ * Ingen 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 General Public License for details.
+ * 
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "GraphObject.h"
+#include "Patch.h"
+#include "ObjectStore.h"
+
+namespace Ingen {
+
+
+Patch*
+GraphObject::parent_patch() const
+{
+	return dynamic_cast<Patch*>((Node*)_parent);
+}
+
+
+// FIXME: these functions are stupid/ugly
+
+void
+GraphObject::add_to_store(ObjectStore* store)
+{
+	store->add(this);
+	_store = store;
+}
+
+
+void
+GraphObject::remove_from_store()
+{
+	if (_store) {
+		TreeNode<GraphObject*>* node = _store->remove(path());
+		if (node != NULL) {
+			assert(_store->find(path()) == NULL);
+			delete node;
+		}
+	}
+
+	_store = NULL;
+}
+
+
+} // namespace Ingen
diff --git a/src/libs/engine/GraphObject.h b/src/libs/engine/GraphObject.h
index 8fe2a0a6..1f3caa7b 100644
--- a/src/libs/engine/GraphObject.h
+++ b/src/libs/engine/GraphObject.h
@@ -49,7 +49,7 @@ public:
 	typedef std::map<string, Atom> MetadataMap;
 
 	GraphObject(GraphObject* parent, const string& name)
-	: _parent(parent), _name(name)
+	: _store(NULL), _parent(parent), _name(name)
 	{
 		assert(parent == NULL || _name.length() > 0);
 		assert(_name.find("/") == string::npos);
@@ -83,10 +83,13 @@ public:
 
 
 	/** Patch and Node override this to recursively add their children. */
-	virtual void add_to_store(ObjectStore* store) = 0;
+	virtual void add_to_store(ObjectStore* store);
 	
 	/** Patch and Node override this to recursively remove their children. */
-	virtual void remove_from_store() = 0;
+	virtual void remove_from_store();
+	
+	/** The Patch this object is a child of. */
+	virtual Patch* parent_patch() const;
 	
 	/** Path is dynamically generated from parent to ease renaming */
 	inline const Path path() const {
@@ -99,6 +102,7 @@ public:
 	}
 
 protected:
+	ObjectStore* _store;
 	GraphObject* _parent;
 	string       _name;
 
diff --git a/src/libs/engine/InternalNode.h b/src/libs/engine/InternalNode.h
index 25a453b9..44810871 100644
--- a/src/libs/engine/InternalNode.h
+++ b/src/libs/engine/InternalNode.h
@@ -35,28 +35,17 @@ class InternalNode : public NodeBase
 {
 public:
 	InternalNode(const Plugin* plugin, const string& path, size_t poly, Patch* parent, SampleRate srate, size_t buffer_size)
-	: NodeBase(plugin, path, poly, parent, srate, buffer_size),
-	  _is_added(false)
+	: NodeBase(plugin, path, poly, parent, srate, buffer_size)
 	{
 	}
 	
 	virtual ~InternalNode() {}
 
-	virtual void deactivate() { if (_is_added) remove_from_patch(); NodeBase::deactivate(); }
-	
 	virtual void process(SampleCount nframes, FrameTime start, FrameTime end)
 		{ NodeBase::process(nframes, start, end); }
 
-	virtual void add_to_patch()      { assert(!_is_added); _is_added = true; }
-	virtual void remove_from_patch() { assert(_is_added); _is_added = false; }
-
-	//virtual void send_creation_messages(ClientInterface* client) const
-	//{ NodeBase::send_creation_messages(client); }
-	
 protected:
 	Plugin* plugin() const { return const_cast<Plugin*>(_plugin); }
-
-	bool   _is_added;
 };
 
 
diff --git a/src/libs/engine/Makefile.am b/src/libs/engine/Makefile.am
index 3e4edf2c..eac42257 100644
--- a/src/libs/engine/Makefile.am
+++ b/src/libs/engine/Makefile.am
@@ -63,6 +63,7 @@ libingen_la_SOURCES = \
 	QueuedEngineInterface.h \
 	QueuedEngineInterface.cpp \
 	GraphObject.h \
+	GraphObject.cpp \
 	Maid.h \
 	Maid.cpp \
 	MaidObject.h \
diff --git a/src/libs/engine/Node.h b/src/libs/engine/Node.h
index 7a4600ee..db220c15 100644
--- a/src/libs/engine/Node.h
+++ b/src/libs/engine/Node.h
@@ -103,15 +103,6 @@ public:
 	 */
 	virtual const Plugin* plugin() const = 0;
 
-	/** Add self to a Patch.
-	 *
-	 * This function must be realtime-safe!  Any non-realtime actions that
-	 * need to be done before adding to a patch can be done in activate().
-	 */
-	virtual void add_to_patch() = 0;
-
-	virtual void remove_from_patch() = 0;
-
 	virtual void set_buffer_size(size_t size) = 0;
 };
 
diff --git a/src/libs/engine/NodeBase.cpp b/src/libs/engine/NodeBase.cpp
index 1462e3bf..7cc005ab 100644
--- a/src/libs/engine/NodeBase.cpp
+++ b/src/libs/engine/NodeBase.cpp
@@ -34,7 +34,6 @@ namespace Ingen {
 
 NodeBase::NodeBase(const Plugin* plugin, const string& name, size_t poly, Patch* parent, SampleRate srate, size_t buffer_size)
 : Node(parent, name),
-  _store(NULL),
   _plugin(plugin),
   _poly(poly),
   _srate(srate),
@@ -79,21 +78,12 @@ NodeBase::deactivate()
 }
 
 
-/*
-void
-NodeBase::send_creation_messages(ClientInterface* client) const
-{
-	cerr << "FIXME: send_creation\n";
-	//_engine.broadcaster()->send_node_to(client, this);
-}
-*/
-
 void
 NodeBase::add_to_store(ObjectStore* store)
 {
 	assert(!_store);
 
-	store->add(this);
+	GraphObject::add_to_store(store);
 	
 	for (size_t i=0; i < num_ports(); ++i)
 		store->add(_ports->at(i));
@@ -105,23 +95,19 @@ NodeBase::add_to_store(ObjectStore* store)
 void
 NodeBase::remove_from_store()
 {
-	// Remove self
-	TreeNode<GraphObject*>* node = _store->remove(path());
-	if (node != NULL) {
-		assert(_store->find(path()) == NULL);
-		delete node;
-	}
-	
 	// Remove ports
 	for (size_t i=0; i < num_ports(); ++i) {
-		node = _store->remove(_ports->at(i)->path());
+		TreeNode<GraphObject*>* node = _store->remove(_ports->at(i)->path());
 		if (node != NULL) {
 			assert(_store->find(_ports->at(i)->path()) == NULL);
 			delete node;
 		}
 	}
+	
+	// Remove self
+	GraphObject::remove_from_store();
 
-	_store = NULL;
+	assert(_store == NULL);
 }
 
 
diff --git a/src/libs/engine/NodeBase.h b/src/libs/engine/NodeBase.h
index d48dd1a1..31deb35e 100644
--- a/src/libs/engine/NodeBase.h
+++ b/src/libs/engine/NodeBase.h
@@ -58,9 +58,6 @@ public:
 	
 	virtual void set_buffer_size(size_t size);
 	
-	virtual void add_to_patch() {}
-	virtual void remove_from_patch() {}
-	
 	void add_to_store(ObjectStore* store);
 	void remove_from_store();
 	
@@ -89,8 +86,6 @@ public:
 	Patch* parent_patch() const { return (Patch*)_parent; }
 	
 protected:	
-	ObjectStore* _store;
-
 	const Plugin* _plugin;
 
 	size_t      _poly;
diff --git a/src/libs/engine/Patch.cpp b/src/libs/engine/Patch.cpp
index 967623e5..d1d3e84a 100644
--- a/src/libs/engine/Patch.cpp
+++ b/src/libs/engine/Patch.cpp
@@ -188,6 +188,9 @@ Patch::add_node(ListNode<Node*>* ln)
 }
 
 
+/** Remove a node.
+ * Realtime Safe.  Preprocessing thread.
+ */
 ListNode<Node*>*
 Patch::remove_node(const string& name)
 {
@@ -263,15 +266,16 @@ Patch::create_port(const string& name, DataType type, size_t buffer_size, bool i
 }
 
 
-/** Remove a port.  Realtime safe.
+/** Remove a port.
+ * Realtime safe.  Preprocessing thread.
  */
 ListNode<Port*>*
-Patch::remove_port(const Port* port)
+Patch::remove_port(const string& name)
 {
 	bool found = false;
 	ListNode<Port*>* ret = NULL;
 	for (List<Port*>::iterator i = _input_ports.begin(); i != _input_ports.end(); ++i) {
-		if ((*i) == port) {
+		if ((*i)->name() == name) {
 			ret = _input_ports.remove(i);
 			found = true;
 		}
@@ -279,7 +283,7 @@ Patch::remove_port(const Port* port)
 
 	if (!found)
 	for (List<Port*>::iterator i = _output_ports.begin(); i != _output_ports.end(); ++i) {
-		if ((*i) == port) {
+		if ((*i)->name() == name) {
 			ret = _output_ports.remove(i);
 			found = true;
 		}
@@ -305,7 +309,7 @@ Patch::remove_port(const Port* port)
 Array<Node*>*
 Patch::build_process_order() const
 {
-	//cerr << "*********** BUILDING PROCESS ORDER FOR " << path() << endl;
+	cerr << "*********** Building process order for " << path() << endl;
 
 	Array<Node*>* const process_order = new Array<Node*>(_nodes.size(), NULL);
 	
diff --git a/src/libs/engine/Patch.h b/src/libs/engine/Patch.h
index b7fe5718..3a4f08d5 100644
--- a/src/libs/engine/Patch.h
+++ b/src/libs/engine/Patch.h
@@ -79,7 +79,7 @@ public:
 	Port*            create_port(const string& name, DataType type, size_t buffer_size, bool is_output);
 	void             add_input(ListNode<Port*>* port)  { _input_ports.push_back(port); } ///< Preprocesser thread
 	void             add_output(ListNode<Port*>* port) { _output_ports.push_back(port); } ///< Preprocessor thread
-	ListNode<Port*>* remove_port(const Port* p);
+	ListNode<Port*>* remove_port(const string& name);
 	
 	void                   add_connection(ListNode<Connection*>* c) { _connections.push_back(c); }
 	ListNode<Connection*>* remove_connection(const Port* src_port, const Port* dst_port);
diff --git a/src/libs/engine/Port.h b/src/libs/engine/Port.h
index 90dbdd00..9f645e3e 100644
--- a/src/libs/engine/Port.h
+++ b/src/libs/engine/Port.h
@@ -43,9 +43,6 @@ class Port : public GraphObject
 public:
 	virtual ~Port() {}
 
-	void add_to_store(ObjectStore* store) { assert(false); }
-	void remove_from_store()        { assert(false); }
-	
 	/** A port's parent is always a node, so static cast should be safe */
 	Node* parent_node() const { return (Node*)_parent; }
 
diff --git a/src/libs/engine/events/AddNodeEvent.cpp b/src/libs/engine/events/AddNodeEvent.cpp
index 74a08b00..92214009 100644
--- a/src/libs/engine/events/AddNodeEvent.cpp
+++ b/src/libs/engine/events/AddNodeEvent.cpp
@@ -96,6 +96,8 @@ AddNodeEvent::pre_process()
 			m_patch->add_node(new ListNode<Node*>(m_node));
 			m_node->add_to_store(_engine.object_store());
 			
+			// FIXME: not really necessary to build process order since it's not connected,
+			// just append to the list
 			if (m_patch->enabled())
 				m_process_order = m_patch->build_process_order();
 		}
@@ -110,8 +112,6 @@ AddNodeEvent::execute(SampleCount nframes, FrameTime start, FrameTime end)
 	QueuedEvent::execute(nframes, start, end);
 
 	if (m_node != NULL) {
-		m_node->add_to_patch();
-		
 		if (m_patch->process_order() != NULL)
 			_engine.maid()->push(m_patch->process_order());
 		m_patch->process_order(m_process_order);
diff --git a/src/libs/engine/events/ClearPatchEvent.cpp b/src/libs/engine/events/ClearPatchEvent.cpp
index 52366139..db2ea54b 100644
--- a/src/libs/engine/events/ClearPatchEvent.cpp
+++ b/src/libs/engine/events/ClearPatchEvent.cpp
@@ -64,8 +64,9 @@ ClearPatchEvent::execute(SampleCount nframes, FrameTime start, FrameTime end)
 	if (m_patch != NULL) {
 		m_patch->disable();
 		
-		for (List<Node*>::const_iterator i = m_patch->nodes().begin(); i != m_patch->nodes().end(); ++i)
-			(*i)->remove_from_patch();
+		cerr << "FIXME: CLEAR PATCH\n";
+		//for (List<Node*>::const_iterator i = m_patch->nodes().begin(); i != m_patch->nodes().end(); ++i)
+		//	(*i)->remove_from_patch();
 
 		if (m_patch->process_order() != NULL) {
 			_engine.maid()->push(m_patch->process_order());
diff --git a/src/libs/engine/events/CreatePatchEvent.cpp b/src/libs/engine/events/CreatePatchEvent.cpp
index f5baf53e..9124f280 100644
--- a/src/libs/engine/events/CreatePatchEvent.cpp
+++ b/src/libs/engine/events/CreatePatchEvent.cpp
@@ -102,8 +102,6 @@ CreatePatchEvent::execute(SampleCount nframes, FrameTime start, FrameTime end)
 			assert(m_parent != NULL);
 			assert(m_path != "/");
 			
-			m_patch->add_to_patch();
-			
 			if (m_parent->process_order() != NULL)
 				_engine.maid()->push(m_parent->process_order());
 			m_parent->process_order(m_process_order);
diff --git a/src/libs/engine/events/DestroyEvent.cpp b/src/libs/engine/events/DestroyEvent.cpp
index 10b870a2..9801f0fe 100644
--- a/src/libs/engine/events/DestroyEvent.cpp
+++ b/src/libs/engine/events/DestroyEvent.cpp
@@ -36,12 +36,16 @@ namespace Ingen {
 
 DestroyEvent::DestroyEvent(Engine& engine, SharedPtr<Responder> responder, FrameTime time, QueuedEventSource* source, const string& path, bool block)
 : QueuedEvent(engine, responder, time, source, source),
-  m_path(path),
-  m_node(NULL),
-  m_patch_listnode(NULL),
-  m_store_treenode(NULL),
-  m_process_order(NULL),
-  m_disconnect_event(NULL)
+  _path(path),
+  _object(NULL),
+  _node(NULL),
+  _port(NULL),
+  _patch_node_listnode(NULL),
+  _patch_port_listnode(NULL),
+  _store_treenode(NULL),
+  _process_order(NULL),
+  _disconnect_node_event(NULL),
+  _disconnect_port_event(NULL)
 {
 	assert(_source);
 }
@@ -49,56 +53,92 @@ DestroyEvent::DestroyEvent(Engine& engine, SharedPtr<Responder> responder, Frame
 
 DestroyEvent::DestroyEvent(Engine& engine, SharedPtr<Responder> responder, FrameTime time, QueuedEventSource* source, Node* node, bool block)
 : QueuedEvent(engine, responder, block, source),
-  m_path(node->path()),
-  m_node(node),
-  m_patch_listnode(NULL),
-  m_store_treenode(NULL),
-  m_process_order(NULL),
-  m_disconnect_event(NULL)
+  _path(node->path()),
+  _object(node),
+  _node(node),
+  _port(NULL),
+  _patch_node_listnode(NULL),
+  _patch_port_listnode(NULL),
+  _store_treenode(NULL),
+  _process_order(NULL),
+  _disconnect_node_event(NULL),
+  _disconnect_port_event(NULL)
 {
 }
 
 
 DestroyEvent::~DestroyEvent()
 {
-	delete m_disconnect_event;
+	delete _disconnect_node_event;
+	delete _disconnect_port_event;
 }
 
 
 void
 DestroyEvent::pre_process()
 {
-	if (m_node == NULL)
-		m_node = _engine.object_store()->find_node(m_path);
-
-	if (m_node != NULL && m_path != "/") {
-		assert(m_node->parent_patch() != NULL);
-		m_patch_listnode = m_node->parent_patch()->remove_node(m_path.name());
-		if (m_patch_listnode != NULL) {
-			assert(m_patch_listnode->elem() == m_node);
+	if (_object == NULL) {
+		_object = _engine.object_store()->find(_path);
+
+		if (_object)  {
+			_node = dynamic_cast<Node*>(_object);
+
+			if (!_node)
+				_port = dynamic_cast<Port*>(_object);
+		}
+	}
+
+	if (_node != NULL && _path != "/") {
+		assert(_node->parent_patch() != NULL);
+		_patch_node_listnode = _node->parent_patch()->remove_node(_path.name());
+		if (_patch_node_listnode != NULL) {
+			assert(_patch_node_listnode->elem() == _node);
 			
-			m_node->remove_from_store();
+			_node->remove_from_store();
 
-			if (m_node->providers()->size() != 0 || m_node->dependants()->size() != 0) {
-				m_disconnect_event = new DisconnectNodeEvent(_engine, m_node);
-				m_disconnect_event->pre_process();
+			if (_node->providers()->size() != 0 || _node->dependants()->size() != 0) {
+				_disconnect_node_event = new DisconnectNodeEvent(_engine, _node);
+				_disconnect_node_event->pre_process();
 			}
 			
-			if (m_node->parent_patch()->enabled()) {
-				m_process_order = m_node->parent_patch()->build_process_order();
+			if (_node->parent_patch()->enabled()) {
+				// FIXME: is this called multiple times?
+				_process_order = _node->parent_patch()->build_process_order();
 				// Remove node to be removed from the process order so it isn't executed by
 				// Patch::run and can safely be destroyed
-				//for (size_t i=0; i < m_process_order->size(); ++i)
-				//	if (m_process_order->at(i) == m_node)
-				//		m_process_order->at(i) = NULL; // ew, gap
+				//for (size_t i=0; i < _process_order->size(); ++i)
+				//	if (_process_order->at(i) == _node)
+				//		_process_order->at(i) = NULL; // ew, gap
 				
 #ifdef DEBUG
 				// Be sure node is removed from process order, so it can be destroyed
-				for (size_t i=0; i < m_process_order->size(); ++i)
-					assert(m_process_order->at(i) != m_node);
+				for (size_t i=0; i < _process_order->size(); ++i)
+					assert(_process_order->at(i) != _node);
 #endif
 			}
 		}
+	} else if (_port) {
+		assert(_port->parent_patch() != NULL);
+		_patch_port_listnode = _port->parent_patch()->remove_port(_path.name());
+		if (_patch_port_listnode != NULL) {
+			assert(_patch_port_listnode->elem() == _port);
+			
+			_port->remove_from_store();
+
+			_disconnect_port_event = new DisconnectPortEvent(_engine, _port);
+			_disconnect_port_event->pre_process();
+			
+			if (_port->parent_patch()->enabled()) {
+				// FIXME: is this called multiple times?
+				_process_order = _port->parent_patch()->build_process_order();
+				// Remove port to be removed from the process order so it isn't executed by
+				// Patch::run and can safely be destroyed
+				//for (size_t i=0; i < _process_order->size(); ++i)
+				//	if (_process_order->at(i) == _port)
+				//		_process_order->at(i) = NULL; // ew, gap
+			}
+		}
+
 	}
 
 	QueuedEvent::pre_process();
@@ -110,15 +150,25 @@ DestroyEvent::execute(SampleCount nframes, FrameTime start, FrameTime end)
 {
 	QueuedEvent::execute(nframes, start, end);
 
-	if (m_patch_listnode != NULL) {
-		m_node->remove_from_patch();
+	if (_patch_node_listnode != NULL) {
+		assert(_node);
+
+		if (_disconnect_node_event != NULL)
+			_disconnect_node_event->execute(nframes, start, end);
 		
-		if (m_disconnect_event != NULL)
-			m_disconnect_event->execute(nframes, start, end);
+		if (_node->parent_patch()->process_order() != NULL)
+			_engine.maid()->push(_node->parent_patch()->process_order());
+		_node->parent_patch()->process_order(_process_order);
+	
+	} else if (_patch_port_listnode != NULL) {
+		assert(_port);
+
+		if (_disconnect_port_event != NULL)
+			_disconnect_port_event->execute(nframes, start, end);
 		
-		if (m_node->parent_patch()->process_order() != NULL)
-			_engine.maid()->push(m_node->parent_patch()->process_order());
-		m_node->parent_patch()->process_order(m_process_order);
+		if (_port->parent_patch()->process_order() != NULL)
+			_engine.maid()->push(_port->parent_patch()->process_order());
+		_port->parent_patch()->process_order(_process_order);
 	}
 }
 
@@ -129,19 +179,28 @@ DestroyEvent::post_process()
 	if (_source)
 		_source->unblock();
 	
-	if (m_node == NULL) {
-		if (m_path == "/")
+	if (_object == NULL) {
+		if (_path == "/")
 			_responder->respond_error("You can not destroy the root patch (/)");
 		else
-			_responder->respond_error("Could not find node to destroy");
-	} else if (m_patch_listnode != NULL) {	
-		m_node->deactivate();
+			_responder->respond_error("Could not find object to destroy");
+	} else if (_patch_node_listnode != NULL) {	
+		assert(_node);
+		_node->deactivate();
+		_responder->respond_ok();
+		if (_disconnect_node_event != NULL)
+			_disconnect_node_event->post_process();
+		_engine.broadcaster()->send_destroyed(_path);
+		_engine.maid()->push(_patch_node_listnode);
+		_engine.maid()->push(_node);
+	} else if (_patch_port_listnode != NULL) {	
+		assert(_port);
 		_responder->respond_ok();
-		if (m_disconnect_event != NULL)
-			m_disconnect_event->post_process();
-		_engine.broadcaster()->send_destroyed(m_path);
-		_engine.maid()->push(m_patch_listnode);
-		_engine.maid()->push(m_node);
+		if (_disconnect_port_event != NULL)
+			_disconnect_port_event->post_process();
+		_engine.broadcaster()->send_destroyed(_path);
+		_engine.maid()->push(_patch_port_listnode);
+		_engine.maid()->push(_port);
 	} else {
 		_responder->respond_error("Unable to destroy object");
 	}
diff --git a/src/libs/engine/events/DestroyEvent.h b/src/libs/engine/events/DestroyEvent.h
index 23d0ba90..ad67bbca 100644
--- a/src/libs/engine/events/DestroyEvent.h
+++ b/src/libs/engine/events/DestroyEvent.h
@@ -32,6 +32,7 @@ namespace Ingen {
 class GraphObject;
 class Patch;
 class Node;
+class Port;
 class Plugin;
 class DisconnectNodeEvent;
 class DisconnectPortEvent;
@@ -53,12 +54,16 @@ public:
 	void post_process();
 
 private:
-	Path                    m_path;
-	Node*                   m_node; 
-	ListNode<Node*>*        m_patch_listnode;
-	TreeNode<GraphObject*>* m_store_treenode;
-	Array<Node*>*           m_process_order; // Patch's new process order
-	DisconnectNodeEvent*    m_disconnect_event;
+	Path                    _path;
+	GraphObject*            _object;
+	Node*                   _node;  ///< Same as _object if it is a Node, otherwise NULL
+	Port*                   _port;  ///< Same as _object if it is a Port, otherwise NULL
+	ListNode<Node*>*        _patch_node_listnode;
+	ListNode<Port*>*        _patch_port_listnode;
+	TreeNode<GraphObject*>* _store_treenode;
+	Array<Node*>*           _process_order;  ///< Patch's new process order
+	DisconnectNodeEvent*    _disconnect_node_event;
+	DisconnectPortEvent*    _disconnect_port_event;
 };
 
 
diff --git a/src/libs/engine/events/DisconnectPortEvent.cpp b/src/libs/engine/events/DisconnectPortEvent.cpp
index 782b4cf4..cfd523e0 100644
--- a/src/libs/engine/events/DisconnectPortEvent.cpp
+++ b/src/libs/engine/events/DisconnectPortEvent.cpp
@@ -52,7 +52,7 @@ DisconnectPortEvent::DisconnectPortEvent(Engine& engine, SharedPtr<Responder> re
 
 DisconnectPortEvent::DisconnectPortEvent(Engine& engine, Port* port)
 : QueuedEvent(engine),
-  m_port_path(""),
+  m_port_path(port->path()),
   m_patch((port->parent_node() == NULL) ? NULL : port->parent_node()->parent_patch()),
   m_port(port),
   m_process_order(NULL),
@@ -132,11 +132,13 @@ void
 DisconnectPortEvent::post_process()
 {
 	if (m_succeeded) {
-		_responder->respond_ok();
+		if (_responder)
+			_responder->respond_ok();
 		for (List<DisconnectionEvent*>::iterator i = m_disconnection_events.begin(); i != m_disconnection_events.end(); ++i)
 			(*i)->post_process();
 	} else {
-		_responder->respond_error("Unable to disconnect port.");
+		if (_responder)
+			_responder->respond_error("Unable to disconnect port.");
 	}
 }