Refactor dangerous multiple inheritance

QObject and CBase both expect to be the root class of the object hierarchy
so it can cause problems if they are used in multiple inheritance.

Refactored the CActive used for starting RConnection into a helper class.

Reviewed-by: Markus Goetz
(cherry picked from commit 5a6365f14006ab50854e41a5927645c7e9966756)

2 files changed, 86 insertions, 25 deletions

diff --git a/src/plugins/bearer/symbian/qnetworksession_impl.cpp b/src/plugins/bearer/symbian/qnetworksession_impl.cpp
index fc6e141..5514511 100644
--- a/src/plugins/bearer/symbian/qnetworksession_impl.cpp
+++ b/src/plugins/bearer/symbian/qnetworksession_impl.cpp
@@ -61,13 +61,12 @@
 QT_BEGIN_NAMESPACE
 
 QNetworkSessionPrivateImpl::QNetworkSessionPrivateImpl(SymbianEngine *engine)
-:   CActive(CActive::EPriorityUserInput), engine(engine),
-    iDynamicUnSetdefaultif(0), ipConnectionNotifier(0),
+:   engine(engine),
+    ipConnectionNotifier(0), ipConnectionStarter(0),
     iHandleStateNotificationsFromManager(false), iFirstSync(true), iStoppedByUser(false),
     iClosedByUser(false), iError(QNetworkSession::UnknownSessionError), iALREnabled(0),
     iConnectInBackground(false), isOpening(false)
 {
-    CActiveScheduler::Add(this);
 
 #ifdef SNAP_FUNCTIONALITY_AVAILABLE
     iMobility = NULL;
@@ -104,7 +103,8 @@ void QNetworkSessionPrivateImpl::closeHandles()
 #endif
 
     // Cancel possible RConnection::Start() - may call RConnection::Close if Start was in progress
-    Cancel();
+    delete ipConnectionStarter;
+    ipConnectionStarter = 0;
     //close any open connection (note Close twice is safe in case Cancel did it above)
     iConnection.Close();
 
@@ -425,9 +425,9 @@ void QNetworkSessionPrivateImpl::open()
 
             pref.SetIapId(symbianConfig->numericIdentifier());
 #endif
-            if (!IsActive()) {
-                iConnection.Start(pref, iStatus);
-                SetActive();
+            if (!ipConnectionStarter) {
+                ipConnectionStarter = new ConnectionStarter(*this, iConnection);
+                ipConnectionStarter->Start(pref);
             }
             // Avoid flip flop of states if the configuration is already
             // active. IsOpen/opened() will indicate when ready.
@@ -453,9 +453,9 @@ void QNetworkSessionPrivateImpl::open()
 #else
         TConnSnapPref snapPref(symbianConfig->numericIdentifier());
 #endif
-        if (!IsActive()) {
-            iConnection.Start(snapPref, iStatus);
-            SetActive();
+        if (!ipConnectionStarter) {
+            ipConnectionStarter = new ConnectionStarter(*this, iConnection);
+            ipConnectionStarter->Start(snapPref);
         }
         // Avoid flip flop of states if the configuration is already
         // active. IsOpen/opened() will indicate when ready.
@@ -464,9 +464,9 @@ void QNetworkSessionPrivateImpl::open()
         }
     } else if (publicConfig.type() == QNetworkConfiguration::UserChoice) {
         iKnownConfigsBeforeConnectionStart = engine->accessPointConfigurationIdentifiers();
-        if (!IsActive()) {
-            iConnection.Start(iStatus);
-            SetActive();
+        if (!ipConnectionStarter) {
+            ipConnectionStarter = new ConnectionStarter(*this, iConnection);
+            ipConnectionStarter->Start();
         }
         newState(QNetworkSession::Connecting);
     }
@@ -1066,13 +1066,14 @@ QNetworkConfiguration QNetworkSessionPrivateImpl::activeConfiguration(TUint32 ia
     return publicConfig;
 }
 
-void QNetworkSessionPrivateImpl::RunL()
+void QNetworkSessionPrivateImpl::ConnectionStartComplete(TInt statusCode)
 {
 #ifdef QT_BEARERMGMT_SYMBIAN_DEBUG
     qDebug() << "QNS this : " << QString::number((uint)this) << " - "
-            << "RConnection::RunL with status code: " << iStatus.Int();
+            << "RConnection::Start completed with status code: " << statusCode;
 #endif
-    TInt statusCode = iStatus.Int();
+    delete ipConnectionStarter;
+    ipConnectionStarter = 0;
 
     switch (statusCode) {
         case KErrNone: // Connection created successfully
@@ -1173,11 +1174,6 @@ void QNetworkSessionPrivateImpl::RunL()
     }
 }
 
-void QNetworkSessionPrivateImpl::DoCancel()
-{
-    iConnection.Close();
-}
-
 // Enters newState if feasible according to current state.
 // AccessPointId may be given as parameter. If it is zero, state-change is assumed to
 // concern this session's configuration. If non-zero, the configuration is looked up
@@ -1566,6 +1562,50 @@ void ConnectionProgressNotifier::RunL()
     }
 }
 
+ConnectionStarter::ConnectionStarter(QNetworkSessionPrivateImpl &owner, RConnection &connection)
+    : CActive(CActive::EPriorityUserInput), iOwner(owner), iConnection(connection)
+{
+    CActiveScheduler::Add(this);
+}
+
+ConnectionStarter::~ConnectionStarter()
+{
+    Cancel();
+}
+
+void ConnectionStarter::Start()
+{
+    if (!IsActive()) {
+        iConnection.Start(iStatus);
+        SetActive();
+    }
+}
+
+void ConnectionStarter::Start(TConnPref &pref)
+{
+    if (!IsActive()) {
+        iConnection.Start(pref, iStatus);
+        SetActive();
+    }
+}
+
+void ConnectionStarter::RunL()
+{
+    iOwner.ConnectionStartComplete(iStatus.Int());
+    //note owner deletes on callback
+}
+
+TInt ConnectionStarter::RunError(TInt err)
+{
+    qWarning() << "ConnectionStarter::RunError" << err;
+    return KErrNone;
+}
+
+void ConnectionStarter::DoCancel()
+{
+    iConnection.Close();
+}
+
 QT_END_NAMESPACE
 
 #endif //QT_NO_BEARERMANAGEMENT
diff --git a/src/plugins/bearer/symbian/qnetworksession_impl.h b/src/plugins/bearer/symbian/qnetworksession_impl.h
index a597812..a5a4f87 100644
--- a/src/plugins/bearer/symbian/qnetworksession_impl.h
+++ b/src/plugins/bearer/symbian/qnetworksession_impl.h
@@ -68,11 +68,12 @@
 QT_BEGIN_NAMESPACE
 
 class ConnectionProgressNotifier;
+class ConnectionStarter;
 class SymbianEngine;
 
 typedef void (*TOpenCUnSetdefaultifFunction)();
 
-class QNetworkSessionPrivateImpl : public QNetworkSessionPrivate, public CActive
+class QNetworkSessionPrivateImpl : public QNetworkSessionPrivate
 #ifdef SNAP_FUNCTIONALITY_AVAILABLE
                                  , public MMobilityProtocolResp
 #endif
@@ -125,7 +126,7 @@ public: // From MMobilityProtocolResp
 #endif    
 
 protected: // From CActive
-    void RunL();
+    void ConnectionStartComplete(TInt statusCode);
     void DoCancel();
     
 private Q_SLOTS:
@@ -167,12 +168,13 @@ private: // data
     mutable RConnection iConnection;
     mutable RConnectionMonitor iConnectionMonitor;
     ConnectionProgressNotifier* ipConnectionNotifier;
-    
+    ConnectionStarter* ipConnectionStarter;
+
     bool iHandleStateNotificationsFromManager;
     bool iFirstSync;
     bool iStoppedByUser;
     bool iClosedByUser;
-    
+
 #ifdef SNAP_FUNCTIONALITY_AVAILABLE    
     CActiveCommsMobilityApiExt* iMobility;
 #endif    
@@ -190,6 +192,7 @@ private: // data
     bool isOpening;
 
     friend class ConnectionProgressNotifier;
+    friend class ConnectionStarter;
 };
 
 class ConnectionProgressNotifier : public CActive
@@ -212,6 +215,24 @@ private: // Data
     
 };
 
+class ConnectionStarter : public CActive
+{
+public:
+    ConnectionStarter(QNetworkSessionPrivateImpl &owner, RConnection &connection);
+    ~ConnectionStarter();
+
+    void Start();
+    void Start(TConnPref &pref);
+protected:
+    void RunL();
+    TInt RunError(TInt err);
+    void DoCancel();
+
+private: // Data
+    QNetworkSessionPrivateImpl &iOwner;
+    RConnection& iConnection;
+};
+
 QT_END_NAMESPACE
 
 #endif //QNETWORKSESSION_IMPL_H