1 files changed, 367 insertions, 0 deletions
diff --git a/flow/bus.cpp b/flow/bus.cpp
new file mode 100644
index 0000000..27e39c5
--- /dev/null
+++ b/flow/bus.cpp
@@ -0,0 +1,367 @@
+    /*
+
+    Copyright (C) 1998-2000 Stefan Westerfeld
+                            stefan@space.twc.de
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Library General Public
+    License as published by the Free Software Foundation; either
+    version 2 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
+    Library General Public License for more details.
+   
+    You should have received a copy of the GNU Library General Public License
+    along with this library; see the file COPYING.LIB.  If not, write to
+    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+    Boston, MA 02110-1301, USA.
+
+    */
+
+#include "bus.h"
+#include "flowsystem.h"
+#include "debug.h"
+#include <iostream>
+#include <set>
+
+#ifdef __SUNPRO_CC
+/* SunPRO CC looses to link this when the_BusManager is static, because
+   later a template implementation file references this symbol. */
+#define the_BusManager __internal_aRts_the_BusManager__Bahh__
+#else
+static
+#endif
+  Arts::BusManager *the_BusManager = 0;
+
+using namespace Arts;
+using namespace std;
+
+// shutdown bus manager on termination
+
+namespace Arts {
+	static class BusManagerShutdown :public StartupClass
+	{
+	public:
+		void startup() { };
+		void shutdown()
+		{
+			if(::the_BusManager)
+			{
+				delete ::the_BusManager;
+				::the_BusManager = 0;
+			}
+		}
+	}	The_BusManagerShutdown;
+}
+
+BusManager::BusManager()
+{
+	// this constructor isn't public (Singleton)
+}
+
+BusManager *BusManager::the()
+{
+	if(!::the_BusManager) ::the_BusManager = new BusManager;
+	return(::the_BusManager);
+}
+
+BusManager::Bus *BusManager::findBus(const string& name)
+{
+	list<Bus *>::iterator bi;
+
+	for(bi = _busList.begin(); bi != _busList.end(); bi++)
+	{
+		if((*bi)->name == name) return(*bi);
+	}
+	Bus *bus = new Bus;
+	bus->left.start();
+	bus->right.start();
+	bus->name = name;
+	_busList.push_back(bus);
+
+	return(bus);
+}
+
+vector<string> *BusManager::busList()
+{
+	set<string> names;
+	set<string>::iterator si;
+	
+	list<Bus *>::iterator bi;
+	for(bi = _busList.begin(); bi != _busList.end(); bi++)
+		names.insert((*bi)->name);
+
+	vector<string> *bl = new vector<string>;
+	for(si=names.begin();si != names.end();si++) bl->push_back(*si);
+	return bl; 
+}
+
+void BusManager::addClient(const string& busname, BusClient *client)
+{
+	Bus *bus = findBus(busname);
+	bus->clients.push_back(client);
+
+	// attach the new client
+	client->snode()->virtualize("left", bus->left._node(), "invalue");
+	client->snode()->virtualize("right", bus->right._node(), "invalue");
+}
+
+void BusManager::removeClient(BusClient *client)
+{
+	list<Bus *>::iterator bi;
+	for(bi = _busList.begin(); bi != _busList.end(); bi++)
+	{
+		Bus *bus = *bi;
+
+		list<BusClient *>::iterator ci;
+		for(ci = bus->clients.begin(); ci != bus->clients.end(); ci++)
+		{
+			if(*ci == client)
+			{
+				bus->clients.erase(ci);
+
+				if(bus->clients.empty() && bus->servers.empty())
+				{
+					_busList.erase(bi);
+					delete bus;
+				}
+				else
+				{
+					client->snode()->devirtualize("left",
+							bus->left._node(), "invalue");
+					client->snode()->devirtualize("right",
+							bus->right._node(), "invalue");
+				}
+				return;
+			}
+		}
+	}
+}
+
+void BusManager::addServer(const string& busname, BusClient *server)
+{
+	Bus *bus = findBus(busname);
+	bus->servers.push_back(server);
+
+	server->snode()->virtualize("left",bus->left._node(),"outvalue");
+	server->snode()->virtualize("right",bus->right._node(),"outvalue");
+}
+
+void BusManager::removeServer(BusClient *server)
+{
+	list<Bus *>::iterator bi;
+	
+	for(bi = _busList.begin(); bi != _busList.end(); bi++)
+	{
+		Bus *bus = *bi;
+
+		list<BusClient *>::iterator si;
+		for(si = bus->servers.begin(); si != bus->servers.end(); si++)
+		{
+			if(*si == server)
+			{
+				bus->servers.erase(si);
+				if(bus->clients.empty() && bus->servers.empty())
+				{
+					_busList.erase(bi);
+					delete bus;
+				}
+				else
+				{
+					server->snode()->devirtualize("left",
+									bus->left._node(), "outvalue");
+					server->snode()->devirtualize("right",
+									bus->right._node(),"outvalue");
+				}
+				return;
+			}
+		}
+	}
+}
+
+namespace Arts {
+
+class Synth_BUS_UPLINK_impl :public Synth_BUS_UPLINK_skel,
+										public StdSynthModule, public BusClient
+{
+	BusManager *bm;
+	bool running, active, relink;
+	string _busname;
+public:
+	Synth_BUS_UPLINK_impl();
+
+	string busname() { return _busname; }
+	void busname(const string& newname);
+	AutoSuspendState autoSuspend() { return asSuspend; }
+	void streamInit();
+	void streamEnd();
+	ScheduleNode *snode() { return _node(); }
+
+	void CallBack();
+
+	void connect();
+	void disconnect();
+};
+
+REGISTER_IMPLEMENTATION(Synth_BUS_UPLINK_impl);
+
+}
+
+Synth_BUS_UPLINK_impl::Synth_BUS_UPLINK_impl() :running(false)
+{
+	bm = BusManager::the();
+}
+
+void Synth_BUS_UPLINK_impl::streamInit()
+{
+	assert(!running);
+	running = true;
+	active = relink = false;
+
+	connect();	// connect to the BusManager
+}
+
+void Synth_BUS_UPLINK_impl::busname(const string& newname)
+{
+	_busname = newname;
+
+	/* TODO */
+	// to be sure that reconnection happens when outside the scheduling cycle
+	if(running)
+	{
+		relink = true;
+		CallBack();
+	}
+}
+
+void Synth_BUS_UPLINK_impl::connect()
+{
+	assert(active == false);
+	if(!_busname.empty())
+	{
+		active = true;
+		bm->addClient(_busname, this);
+	}
+}
+
+void Synth_BUS_UPLINK_impl::disconnect()
+{
+	if(active == true)
+	{
+		bm->removeClient(this);
+		active = false;
+	}
+}
+
+void Synth_BUS_UPLINK_impl::CallBack()
+{
+	if(relink)
+	{
+		disconnect();
+		connect();
+		relink = false;
+	}
+}
+
+void Synth_BUS_UPLINK_impl::streamEnd()
+{
+	disconnect();
+
+	assert(running);
+	running = false;
+}
+
+namespace Arts {
+
+class Synth_BUS_DOWNLINK_impl :public Synth_BUS_DOWNLINK_skel,
+										public StdSynthModule, public BusClient
+{
+	bool running, active, relink;
+	BusManager *bm;
+
+	string _busname;
+
+	void connect();
+	void disconnect();
+
+public:
+	string busname() { return _busname; }
+	void busname(const string& newname);
+
+	Synth_BUS_DOWNLINK_impl();
+	AutoSuspendState autoSuspend() { return asSuspend; }
+	void streamInit();
+	void streamEnd();
+	void CallBack();
+	ScheduleNode *snode() { return _node(); }
+};
+
+REGISTER_IMPLEMENTATION(Synth_BUS_DOWNLINK_impl);
+
+}
+
+Synth_BUS_DOWNLINK_impl::Synth_BUS_DOWNLINK_impl() :running(false)
+{
+	bm = BusManager::the();
+}
+
+void Synth_BUS_DOWNLINK_impl::streamInit()
+{
+	assert(!running);
+	running = true;
+
+	active = relink = false;
+	connect();
+}
+
+void Synth_BUS_DOWNLINK_impl::streamEnd()
+{
+	assert(running);
+	running = false;
+
+	disconnect();
+}
+
+void Synth_BUS_DOWNLINK_impl::connect()
+{
+	assert(active == false);
+	if(!_busname.empty())
+	{
+		active = true;
+		bm->addServer(_busname, this);
+	}
+}
+
+void Synth_BUS_DOWNLINK_impl::disconnect()
+{
+	if(active == true)
+	{
+		bm->removeServer(this);
+		active = false;
+	}
+}
+
+void Synth_BUS_DOWNLINK_impl::CallBack()
+{
+	if(relink)
+	{
+		disconnect();
+		connect();
+		relink = false;
+	}
+}
+
+void Synth_BUS_DOWNLINK_impl::busname(const string& newname)
+{
+	_busname = newname;
+
+	/* TODO */
+	// to be sure that reconnection happens when outside the scheduling cycle
+	if(running)
+	{
+		relink = true;
+		CallBack();
+	}
+}