X-Git-Url: https://git.quassel-irc.org/?p=quassel.git;a=blobdiff_plain;f=src%2Fcommon%2Fsignalproxy.cpp;h=411c8dae3a2f6db7ead13637a99f2e2a11245299;hp=5c2f20e0cef4e9f94e3d3abe8b7461daf361d352;hb=8ec76e512d20ce5d1dc76de556bb98a06b75d695;hpb=0d53027b95e4bd9ca369bd909c17cf13612f7dd5

diff --git a/src/common/signalproxy.cpp b/src/common/signalproxy.cpp
index 5c2f20e0..411c8dae 100644
--- a/src/common/signalproxy.cpp
+++ b/src/common/signalproxy.cpp
@@ -90,13 +90,14 @@ int SignalRelay::qt_metacall(QMetaObject::Call _c, int _id, void **_a) {
       }
       QMultiHash<int, QByteArray>::const_iterator funcIter = sigNames.constFind(_id);
       while(funcIter != sigNames.constEnd() && funcIter.key() == _id) {
-        proxy->dispatchSignal(funcIter.value(), params);
+        proxy->dispatchSignal(SignalProxy::RpcCall, QVariantList() << funcIter.value() << params);
         funcIter++;
       }
       
       // dispatch Sync Signal if necessary
       QByteArray signature(caller->metaObject()->method(_id).signature());
-      if(synchronize() && proxy->syncMap(qobject_cast<SyncableObject *>(caller)).contains(signature)) {
+      SyncableObject *syncObject = qobject_cast<SyncableObject *>(caller);
+      if(synchronize() && proxy->syncMap(syncObject).contains(signature)) {
 	 //qDebug() << "__SYNC__ >>>"
 	 //	 << caller->metaObject()->className()
 	 //	 << caller->objectName()
@@ -104,9 +105,9 @@ int SignalRelay::qt_metacall(QMetaObject::Call _c, int _id, void **_a) {
 	 //	 << params;
 	// params.prepend(QVariant(_id));
 	params.prepend(signature);
-	params.prepend(caller->objectName());
-	params.prepend(caller->metaObject()->className());
-	proxy->dispatchSignal((int)SignalProxy::Sync, params);
+	params.prepend(syncObject->objectName());
+	params.prepend(syncObject->syncMetaObject()->className());
+	proxy->dispatchSignal(SignalProxy::Sync, params);
       }
     }
     _id -= QObject::staticMetaObject.methodCount();
@@ -115,7 +116,11 @@ int SignalRelay::qt_metacall(QMetaObject::Call _c, int _id, void **_a) {
 }
 
 void SignalRelay::setSynchronize(bool sync) {
-  const QMetaObject *meta = caller->metaObject();
+  SyncableObject *syncObject = qobject_cast<SyncableObject *>(caller);
+  if(!syncObject)
+    return;
+
+  const QMetaObject *meta = syncObject->syncMetaObject();
   if(!_sync && sync) {
     // enable Sync
     for(int i = 0; i < meta->methodCount(); i++ ) {
@@ -133,8 +138,12 @@ void SignalRelay::setSynchronize(bool sync) {
 }
 
 bool SignalRelay::isSyncMethod(int i) {
-  QByteArray signature = caller->metaObject()->method(i).signature();
-  if(!proxy->syncMap(qobject_cast<SyncableObject *>(caller)).contains(signature))
+  SyncableObject *syncObject = qobject_cast<SyncableObject *>(caller);
+  if(!syncObject)
+    return false;
+
+  QByteArray signature = syncObject->syncMetaObject()->method(i).signature();
+  if(!proxy->syncMap(syncObject).contains(signature))
     return false;
   
   if(proxy->proxyMode() == SignalProxy::Server && !signature.contains("Requested"))
@@ -200,6 +209,12 @@ SignalProxy::~SignalProxy() {
   QList<QObject*> senders = _relayHash.keys();
   foreach(QObject* sender, senders)
     detachObject(sender);
+
+  // close peer connections
+  foreach(QIODevice *device, _peerByteCount.keys()) {
+    device->close();
+    delete device;
+  }
 }
 
 void SignalProxy::setProxyMode(ProxyMode mode) {
@@ -221,10 +236,15 @@ SignalProxy::ProxyMode SignalProxy::proxyMode() const {
 }
 
 void SignalProxy::initServer() {
+  disconnect(&_heartBeatTimer, 0, this, 0);
+  _heartBeatTimer.stop();
 }
 
 void SignalProxy::initClient() {
   attachSlot("__objectRenamed__", this, SLOT(objectRenamed(QByteArray, QString, QString)));
+  connect(&_heartBeatTimer, SIGNAL(timeout()),
+	  this, SLOT(sendHeartBeat()));
+  _heartBeatTimer.start(60 * 1000); // msecs: one beep per minute
 }
 
 bool SignalProxy::addPeer(QIODevice* iodev) {
@@ -258,35 +278,9 @@ bool SignalProxy::addPeer(QIODevice* iodev) {
   return true;
 }
 
-void SignalProxy::removePeerBySender() {
-  // OK we're brutal here... but since it's a private slot we know what we've got connected to it...
-  QIODevice *ioDev = (QIODevice *)(sender());
-  removePeer(ioDev);
-  qDebug() << "Client disconnected.";
-}
-
-void SignalProxy::objectRenamed(QString oldname, QString newname) {
-  const QMetaObject *meta = sender()->metaObject();
-  const QByteArray className(meta->className());
-  objectRenamed(className, oldname, newname);
-
-  if(proxyMode() == Client)
-    return;
-  
-  QVariantList params;
-  params << className << oldname << newname;
-  dispatchSignal("__objectRenamed__", params);
-}
-
-void SignalProxy::objectRenamed(QByteArray classname, QString oldname, QString newname) {
-  if(_syncSlave.contains(classname) && _syncSlave[classname].contains(oldname) && oldname != newname)
-    _syncSlave[classname][newname] = _syncSlave[classname].take(oldname);
-}
-
-
 void SignalProxy::removePeer(QIODevice* iodev) {
   if(_peerByteCount.isEmpty()) {
-    qWarning() << "SignalProxy: No peers in use!";
+    qWarning() << "SignalProxy::removePeer(): No peers in use!";
     return;
   }
 
@@ -306,15 +300,7 @@ void SignalProxy::removePeer(QIODevice* iodev) {
     qWarning() << "SignalProxy: unknown QIODevice" << iodev;
     return;
   }
-     
-  // take a last gasp
-  while(true) {
-    QVariant var;
-    if(readDataFromDevice(iodev, _peerByteCount[iodev], var))
-      receivePeerSignal(iodev, var);
-    else
-      break;
-  }
+
   _peerByteCount.remove(iodev);
 
   disconnect(iodev, 0, this, 0);
@@ -324,8 +310,36 @@ void SignalProxy::removePeer(QIODevice* iodev) {
     emit disconnected();
 }
 
+void SignalProxy::removePeerBySender() {
+  // OK we're brutal here... but since it's a private slot we know what we've got connected to it...
+  QIODevice *ioDev = (QIODevice *)(sender());
+  removePeer(ioDev);
+  qDebug() << "Client disconnected.";
+}
+
+void SignalProxy::objectRenamed(const QString &newname, const QString &oldname) {
+  SyncableObject *syncObject = qobject_cast<SyncableObject *>(sender());
+  const QMetaObject *meta = syncObject->metaObject();
+  const QByteArray className(meta->className());
+  objectRenamed(className, newname, oldname);
+
+  if(proxyMode() == Client)
+    return;
+  
+  QVariantList params;
+  params << "__objectRenamed__" << className << newname << oldname;
+  dispatchSignal(RpcCall, params);
+}
+
+void SignalProxy::objectRenamed(const QByteArray &classname, const QString &newname, const QString &oldname) {
+  if(_syncSlave.contains(classname) && _syncSlave[classname].contains(oldname) && oldname != newname) {
+    SyncableObject *obj = _syncSlave[classname][newname] = _syncSlave[classname].take(oldname);
+    requestInit(obj);
+  }
+}
+
 void SignalProxy::setArgTypes(QObject* obj, int methodId) {
-  const QMetaObject *meta = obj->metaObject();
+  const QMetaObject *meta = metaObject(obj);
   QList<QByteArray> p = meta->method(methodId).parameterTypes();
   QList<int> argTypes;
   int ct = p.count();
@@ -337,14 +351,31 @@ void SignalProxy::setArgTypes(QObject* obj, int methodId) {
 }
 
 const QList<int> &SignalProxy::argTypes(QObject *obj, int methodId) {
-  Q_ASSERT(_classInfo.contains(obj->metaObject()));
-  if(!_classInfo[obj->metaObject()]->argTypes.contains(methodId))
+  const QMetaObject *meta = metaObject(obj);
+  Q_ASSERT(_classInfo.contains(meta));
+  if(!_classInfo[meta]->argTypes.contains(methodId))
     setArgTypes(obj, methodId);
-  return _classInfo[obj->metaObject()]->argTypes[methodId];
+  return _classInfo[meta]->argTypes[methodId];
+}
+
+void SignalProxy::setReturnType(QObject *obj, int methodId) {
+  const QMetaObject *meta = metaObject(obj);
+  int returnType = QMetaType::type(meta->method(methodId).typeName());
+
+  Q_ASSERT(!_classInfo[meta]->returnType.contains(methodId));
+  _classInfo[meta]->returnType[methodId] = returnType;
+}
+
+const int &SignalProxy::returnType(QObject *obj, int methodId) {
+  const QMetaObject *meta = metaObject(obj);
+  Q_ASSERT(_classInfo.contains(meta));
+  if(!_classInfo[meta]->returnType.contains(methodId))
+    setReturnType(obj, methodId);
+  return _classInfo[meta]->returnType[methodId];
 }
 
 void SignalProxy::setMinArgCount(QObject *obj, int methodId) {
-  const QMetaObject *meta = obj->metaObject();
+  const QMetaObject *meta = metaObject(obj);
   QString signature(meta->method(methodId).signature());
   int minCount = meta->method(methodId).parameterTypes().count() - signature.count("=");
   Q_ASSERT(!_classInfo[meta]->minArgCount.contains(methodId));
@@ -352,29 +383,31 @@ void SignalProxy::setMinArgCount(QObject *obj, int methodId) {
 }
 
 const int &SignalProxy::minArgCount(QObject *obj, int methodId) {
-  Q_ASSERT(_classInfo.contains(obj->metaObject()));
-  if(!_classInfo[obj->metaObject()]->minArgCount.contains(methodId))
+  const QMetaObject *meta = metaObject(obj);
+  Q_ASSERT(_classInfo.contains(meta));
+  if(!_classInfo[meta]->minArgCount.contains(methodId))
     setMinArgCount(obj, methodId);
-  return _classInfo[obj->metaObject()]->minArgCount[methodId];
+  return _classInfo[meta]->minArgCount[methodId];
 }
 
 void SignalProxy::setMethodName(QObject *obj, int methodId) {
-  const QMetaObject *meta = obj->metaObject();
+  const QMetaObject *meta = metaObject(obj);
   QByteArray method(::methodName(meta->method(methodId)));
   Q_ASSERT(!_classInfo[meta]->methodNames.contains(methodId));
   _classInfo[meta]->methodNames[methodId] = method;
 }
 
 const QByteArray &SignalProxy::methodName(QObject *obj, int methodId) {
-  Q_ASSERT(_classInfo.contains(obj->metaObject()));
-  if(!_classInfo[obj->metaObject()]->methodNames.contains(methodId))
+  const QMetaObject *meta = metaObject(obj);
+  Q_ASSERT(_classInfo.contains(meta));
+  if(!_classInfo[meta]->methodNames.contains(methodId))
     setMethodName(obj, methodId);
-  return _classInfo[obj->metaObject()]->methodNames[methodId];
+  return _classInfo[meta]->methodNames[methodId];
 }
 
 
 void SignalProxy::setSyncMap(SyncableObject *obj) {
-  const QMetaObject *meta = obj->metaObject();
+  const QMetaObject *meta = obj->syncMetaObject();
   QHash<QByteArray, int> syncMap;
   
   QList<int> slotIndexes;
@@ -383,6 +416,15 @@ void SignalProxy::setSyncMap(SyncableObject *obj) {
       slotIndexes << i;
   }
 
+  // we're faking sync pairs for sync replies
+  QByteArray slotSignature;
+  foreach(int slotIdx, slotIndexes) {
+    slotSignature = QByteArray(meta->method(slotIdx).signature());
+    if(!slotSignature.startsWith("receive"))
+      continue;
+    syncMap[slotSignature] = slotIdx;
+  }
+
   QMetaMethod signal, slot;
   int matchIdx;
   for(int signalIdx = 0; signalIdx < meta->methodCount(); signalIdx++) {
@@ -409,34 +451,101 @@ void SignalProxy::setSyncMap(SyncableObject *obj) {
 }
 
 const QHash<QByteArray,int> &SignalProxy::syncMap(SyncableObject *obj) {
-  Q_ASSERT(_classInfo.contains(obj->metaObject()));
-  if(_classInfo[obj->metaObject()]->syncMap.isEmpty())
+  const QMetaObject *meta = obj->syncMetaObject();
+  Q_ASSERT(_classInfo.contains(meta));
+  if(_classInfo[meta]->syncMap.isEmpty())
     setSyncMap(obj);
-  return _classInfo[obj->metaObject()]->syncMap;
+  return _classInfo[meta]->syncMap;
+}
+
+void SignalProxy::setReceiveMap(SyncableObject *obj) {
+  const QMetaObject *meta = obj->syncMetaObject();
+  Q_ASSERT(_classInfo.contains(meta));
+
+  QHash<int, int> receiveMap;
+
+  QMetaMethod requestSlot;
+  QByteArray returnTypeName;
+  QByteArray signature;
+  QByteArray methodName;
+  QByteArray params;
+  int paramsPos;
+  int receiverId;
+  const int methodCount = meta->methodCount();
+  for(int i = 0; i < methodCount; i++) {
+    requestSlot = meta->method(i);
+    if(requestSlot.methodType() != QMetaMethod::Slot)
+      continue;
+
+    returnTypeName = requestSlot.typeName();
+    if(QMetaType::Void == (QMetaType::Type)returnType(obj, i))
+      continue;
+
+    signature = QByteArray(requestSlot.signature());
+    if(!signature.startsWith("request"))
+      continue;
+    
+    paramsPos = signature.indexOf('(');
+    if(paramsPos == -1)
+      continue;
+
+    methodName = signature.left(paramsPos);
+    params = signature.mid(paramsPos);
+
+    methodName = methodName.replace("request", "receive");
+    params = params.left(params.count() - 1) + ", " + returnTypeName + ")";
+
+    signature = QMetaObject::normalizedSignature(methodName + params);
+    receiverId = meta->indexOfSlot(signature);
+
+    if(receiverId == -1) {
+      signature = QMetaObject::normalizedSignature(methodName + "(" + returnTypeName + ")");
+      receiverId = meta->indexOfSlot(signature);
+    }
+
+    if(receiverId != -1)
+      receiveMap[i] = receiverId;
+  }
+  _classInfo[meta]->receiveMap = receiveMap;  
+}
+
+const QHash<int, int> &SignalProxy::receiveMap(SyncableObject *obj) {
+  const QMetaObject *meta = obj->syncMetaObject();
+  Q_ASSERT(_classInfo.contains(meta));
+  if(_classInfo[meta]->receiveMap.isEmpty())
+    setReceiveMap(obj);
+  return _classInfo[meta]->receiveMap;
 }
 
-void SignalProxy::setUpdatedRemotelyId(QObject *obj) {
-  const QMetaObject *meta = obj->metaObject();
+void SignalProxy::setUpdatedRemotelyId(SyncableObject *obj) {
+  const QMetaObject *meta = obj->syncMetaObject();
   Q_ASSERT(_classInfo.contains(meta));
   _classInfo[meta]->updatedRemotelyId = meta->indexOfSignal("updatedRemotely()");
 }
 
 int SignalProxy::updatedRemotelyId(SyncableObject *obj) {
-  Q_ASSERT(_classInfo.contains(obj->metaObject()));
-  return _classInfo[obj->metaObject()]->updatedRemotelyId;
+  Q_ASSERT(_classInfo.contains(obj->syncMetaObject()));
+  return _classInfo[obj->syncMetaObject()]->updatedRemotelyId;
+}
+
+const QMetaObject *SignalProxy::metaObject(QObject *obj) {
+  if(SyncableObject *syncObject = qobject_cast<SyncableObject *>(obj))
+    return syncObject->syncMetaObject();
+  else
+    return obj->metaObject();
 }
 
 void SignalProxy::createClassInfo(QObject *obj) {
-  if(_classInfo.contains(obj->metaObject()))
+  const QMetaObject *meta = metaObject(obj);
+  if(_classInfo.contains(meta))
     return;
 
   ClassInfo *classInfo = new ClassInfo();
-  _classInfo[obj->metaObject()] = classInfo;
-  setUpdatedRemotelyId(obj);
+  _classInfo[meta] = classInfo;
 }
 
 bool SignalProxy::attachSignal(QObject* sender, const char* signal, const QByteArray& sigName) {
-  const QMetaObject* meta = sender->metaObject();
+  const QMetaObject* meta = metaObject(sender);
   QByteArray sig(meta->normalizedSignature(signal).mid(1));
   int methodId = meta->indexOfMethod(sig.constData());
   if(methodId == -1 || meta->method(methodId).methodType() != QMetaMethod::Signal) {
@@ -478,7 +587,8 @@ bool SignalProxy::attachSlot(const QByteArray& sigName, QObject* recv, const cha
 
 void SignalProxy::synchronize(SyncableObject *obj) {
   createClassInfo(obj);
-
+  setUpdatedRemotelyId(obj);
+  
   // attaching all the Signals
   SignalRelay* relay;
   if(_relayHash.contains(obj))
@@ -489,13 +599,11 @@ void SignalProxy::synchronize(SyncableObject *obj) {
   relay->setSynchronize(true);
 
   // attaching as slave to receive sync Calls
-  QByteArray className(obj->metaObject()->className());
+  QByteArray className(obj->syncMetaObject()->className());
   _syncSlave[className][obj->objectName()] = obj;
 
   if(proxyMode() == Server) {
-    if(obj->metaObject()->indexOfSignal(QMetaObject::normalizedSignature("renameObject(QString, QString)")) != -1)
-      connect(obj, SIGNAL(renameObject(QString, QString)), this, SLOT(objectRenamed(QString, QString)));
-
+    connect(obj, SIGNAL(objectRenamed(QString, QString)), this, SLOT(objectRenamed(QString, QString)));
     setInitialized(obj);
   } else {
     requestInit(obj);
@@ -516,9 +624,9 @@ void SignalProxy::requestInit(SyncableObject *obj) {
     return;
 
   QVariantList params;
-  params << obj->metaObject()->className()
+  params << obj->syncMetaObject()->className()
 	 << obj->objectName();
-  dispatchSignal((int)InitRequest, params);
+  dispatchSignal(InitRequest, params);
 }
 
 void SignalProxy::detachSender() {
@@ -555,7 +663,7 @@ void SignalProxy::stopSync(SyncableObject* obj) {
   // gladly the objectName() is still valid. So we have only to iterate over the classes not each instance! *sigh*
   QHash<QByteArray, ObjectId>::iterator classIter = _syncSlave.begin();
   while(classIter != _syncSlave.end()) {
-    if(classIter->contains(obj->objectName())) {
+    if(classIter->contains(obj->objectName()) && classIter.value()[obj->objectName()] == obj) {
       classIter->remove(obj->objectName());
       break;
     }
@@ -563,17 +671,17 @@ void SignalProxy::stopSync(SyncableObject* obj) {
   }
 }
 
-void SignalProxy::dispatchSignal(QIODevice *receiver, const QVariant &identifier, const QVariantList &params) {
+void SignalProxy::dispatchSignal(QIODevice *receiver, const RequestType &requestType, const QVariantList &params) {
   QVariantList packedFunc;
-  packedFunc << identifier;
+  packedFunc << (qint16)requestType;
   packedFunc << params;
   writeDataToDevice(receiver, QVariant(packedFunc));
 }
 
-void SignalProxy::dispatchSignal(const QVariant &identifier, const QVariantList &params) {
+void SignalProxy::dispatchSignal(const RequestType &requestType, const QVariantList &params) {
   // yes I know we have a little code duplication here... it's for the sake of performance
   QVariantList packedFunc;
-  packedFunc << identifier;
+  packedFunc << (qint16)requestType;
   packedFunc << params;
   foreach(QIODevice* dev, _peerByteCount.keys())
     writeDataToDevice(dev, QVariant(packedFunc));
@@ -582,24 +690,36 @@ void SignalProxy::dispatchSignal(const QVariant &identifier, const QVariantList
 void SignalProxy::receivePeerSignal(QIODevice *sender, const QVariant &packedFunc) {
   QVariantList params(packedFunc.toList());
 
-  QVariant call = params.takeFirst();
-  if(call.type() != QVariant::Int)
-    return handleSignal(call.toByteArray(), params);
+  if(params.isEmpty()) {
+    qWarning() << "SignalProxy::receivePeerSignal(): received incompatible Data:" << packedFunc;
+    return;
+  }
+  
+  int callType = params.takeFirst().value<int>();
 
-  switch(call.toInt()) {
+  switch(callType) {
+  case RpcCall:
+    if(params.empty()) {
+      qWarning() << "SignalProxy::receivePeerSignal(): received empty RPC-Call";
+      return;
+    } else {
+      return handleSignal(params.takeFirst().toByteArray(), params);
+    }
   case Sync:
-    return handleSync(params);
+    return handleSync(sender, params);
   case InitRequest:
     return handleInitRequest(sender, params);
   case InitData:
     return handleInitData(sender, params);
+  case HeartBeat:
+    return;
   default:
-    qWarning() << "received undefined CallType" << call.toInt();
+    qWarning() << "SignalProxy::receivePeerSignal(): received undefined CallType" << callType << params;
     return;
   }
 }
 
-void SignalProxy::handleSync(QVariantList params) {
+void SignalProxy::handleSync(QIODevice *sender, QVariantList params) {
   if(params.count() < 3) {
     qWarning() << "received invalid Sync call" << params;
     return;
@@ -610,23 +730,39 @@ void SignalProxy::handleSync(QVariantList params) {
   QByteArray signal = params.takeFirst().toByteArray();
 
   if(!_syncSlave.contains(className) || !_syncSlave[className].contains(objectName)) {
-    qWarning() << QString("no registered receiver for sync call: %s::%s (objectName=\"%s\"). Params are:").arg(QString(className)).arg(QString(signal)).arg(objectName)
+    qWarning() << QString("no registered receiver for sync call: %1::%2 (objectName=\"%3\"). Params are:").arg(QString(className)).arg(QString(signal)).arg(objectName)
 	       << params;
     return;
   }
 
   SyncableObject *receiver = _syncSlave[className][objectName];
   if(!syncMap(receiver).contains(signal)) {
-    qWarning() << QString("no matching slot for sync call: %s::%s (objectName=\"%s\"). Params are:").arg(QString(className)).arg(QString(signal)).arg(objectName)
+    qWarning() << QString("no matching slot for sync call: %1::%2 (objectName=\"%3\"). Params are:").arg(QString(className)).arg(QString(signal)).arg(objectName)
 	       << params;
     return;
   }
 
   int slotId = syncMap(receiver)[signal];
-  if(!invokeSlot(receiver, slotId, params)) {
+
+  QVariant returnValue((QVariant::Type)returnType(receiver, slotId));
+  if(!invokeSlot(receiver, slotId, params, returnValue)) {
     qWarning("SignalProxy::handleSync(): invokeMethod for \"%s\" failed ", methodName(receiver, slotId).constData());
     return;
   }
+
+  if(returnValue.type() != QVariant::Invalid && receiveMap(receiver).contains(slotId)) {
+    int receiverId = receiveMap(receiver)[slotId];
+    QVariantList returnParams;
+    returnParams << className
+		 << objectName
+		 << QByteArray(receiver->metaObject()->method(receiverId).signature());
+    if(argTypes(receiver, receiverId).count() > 1)
+      returnParams << params;
+    returnParams << returnValue;
+    dispatchSignal(sender, Sync, returnParams);
+  }
+  
+  // send emit update signal
   invokeSlot(receiver, updatedRemotelyId(receiver));
 }
 
@@ -655,11 +791,11 @@ void SignalProxy::handleInitRequest(QIODevice *sender, const QVariantList &param
   SyncableObject *obj = _syncSlave[className][objectName];
 
   QVariantList params_;
-  params_ << obj->metaObject()->className()
-	  << obj->objectName()
+  params_ << className
+	  << objectName
 	  << initData(obj);
 
-  dispatchSignal(sender, (int)InitData, params_);
+  dispatchSignal(sender, InitData, params_);
 }
 
 void SignalProxy::handleInitData(QIODevice *sender, const QVariantList &params) {
@@ -703,7 +839,7 @@ void SignalProxy::handleSignal(const QByteArray &funcName, const QVariantList &p
   }
 }
 
-bool SignalProxy::invokeSlot(QObject *receiver, int methodId, const QVariantList &params) {
+bool SignalProxy::invokeSlot(QObject *receiver, int methodId, const QVariantList &params, QVariant &returnValue) {
   const QList<int> args = argTypes(receiver, methodId);
   const int numArgs = params.count() < args.count()
     ? params.count()
@@ -714,9 +850,10 @@ bool SignalProxy::invokeSlot(QObject *receiver, int methodId, const QVariantList
       return false;
   }
 
-  void *_a[] = {0, // return type
+  void *_a[] = {0,              // return type... 
 		0, 0, 0, 0 , 0, // and 10 args - that's the max size qt can handle with signals and slots
 		0, 0, 0, 0 , 0};
+
   // check for argument compatibility and build params array
   for(int i = 0; i < numArgs; i++) {
     if(!params[i].isValid()) {
@@ -731,6 +868,8 @@ bool SignalProxy::invokeSlot(QObject *receiver, int methodId, const QVariantList
     _a[i+1] = const_cast<void *>(params[i].constData());
   }
 
+  if(returnValue.type() != QVariant::Invalid)
+    _a[0] = const_cast<void *>(returnValue.constData());
     
   Qt::ConnectionType type = QThread::currentThread() == receiver->thread()
     ? Qt::DirectConnection
@@ -740,12 +879,17 @@ bool SignalProxy::invokeSlot(QObject *receiver, int methodId, const QVariantList
     return receiver->qt_metacall(QMetaObject::InvokeMetaMethod, methodId, _a) < 0;
   } else {
     qWarning() << "Queued Connections are not implemented yet";
-    // not to self: qmetaobject.cpp:990 ff
+    // note to self: qmetaobject.cpp:990 ff
     return false;
   }
   
 }
 
+bool SignalProxy::invokeSlot(QObject *receiver, int methodId, const QVariantList &params) {
+  QVariant ret;
+  return invokeSlot(receiver, methodId, params, ret);
+}
+
 void SignalProxy::dataAvailable() {
   // yet again. it's a private slot. no need for checks.
   QIODevice* ioDev = qobject_cast<QIODevice* >(sender());
@@ -832,6 +976,10 @@ void SignalProxy::setInitData(SyncableObject *obj, const QVariantMap &properties
   invokeSlot(obj, updatedRemotelyId(obj));
 }
 
+void SignalProxy::sendHeartBeat() {
+  dispatchSignal(SignalProxy::HeartBeat, QVariantList());
+}
+
 void SignalProxy::dumpProxyStats() {
   QString mode;
   if(proxyMode() == Server)