QmlDbg: Don't wait infinitely for messages on application output

We only connect to the port when we get a 'Waiting for connection ...'
message on application output. This was done mainly to avoid lots
of failed connects, and therefore an unresponsive UI on Windows.

However, the application output might be redirected for various reasons.
Therefore fall back to busy connect after a certain time (4 seconds
for profiling, 8 seconds for debugging).

Change-Id: Ie1b943f678ced40c030cc134493a2adf7e3bc9df
Reviewed-on: http://codereview.qt.nokia.com/2323
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Christiaan Janssen <christiaan.janssen@nokia.com>

src/plugins/debugger/qml/qmlengine.cpp

@@ -164,6 +164,7 @@ private:
     QmlAdapter m_adapter;
     ApplicationLauncher m_applicationLauncher;
     Utils::FileInProjectFinder fileFinder;
+    QTimer m_noDebugOutputTimer;
 };
 
 QmlEnginePrivate::QmlEnginePrivate(QmlEngine *q)
@@ -203,6 +204,12 @@ QmlEngine::QmlEngine(const DebuggerStartParameters &startParameters,
     connect(&d->m_applicationLauncher,
         SIGNAL(appendMessage(QString,Utils::OutputFormat)),
         SLOT(appendMessage(QString,Utils::OutputFormat)));
+
+// Only wait 8 seconds for the 'Waiting for connection' on application ouput, then just try to connect
+    // (application output might be redirected / blocked)
+    d->m_noDebugOutputTimer.setSingleShot(true);
+    d->m_noDebugOutputTimer.setInterval(8000);
+    connect(&d->m_noDebugOutputTimer, SIGNAL(timeout()), this, SLOT(beginConnection()));
 }
 
 QmlEngine::~QmlEngine()
@@ -251,6 +258,12 @@ void QmlEngine::connectionEstablished()
     notifyEngineRunAndInferiorRunOk();
 }
 
+void QmlEngine::beginConnection()
+{
+    d->m_noDebugOutputTimer.stop();
+    d->m_adapter.beginConnection();
+}
+
 void QmlEngine::connectionStartupFailed()
 {
     Core::ICore * const core = Core::ICore::instance();
@@ -273,7 +286,7 @@ void QmlEngine::retryMessageBoxFinished(int result)
 {
     switch (result) {
     case QMessageBox::Retry: {
-        d->m_adapter.beginConnection();
+        beginConnection();
         break;
     }
     case QMessageBox::Help: {
@@ -311,6 +324,9 @@ void QmlEngine::filterApplicationMessage(const QString &msg, int /*channel*/)
 
     const int index = msg.indexOf(qddserver);
     if (index != -1) {
+        // we're actually getting debug output
+        d->m_noDebugOutputTimer.stop();
+
         QString status = msg;
         status.remove(0, index + qddserver.length()); // chop of 'QDeclarativeDebugServer: '
 
@@ -322,7 +338,7 @@ void QmlEngine::filterApplicationMessage(const QString &msg, int /*channel*/)
 
         QString errorMessage;
         if (status.startsWith(waitingForConnection)) {
-            d->m_adapter.beginConnection();
+            beginConnection();
         } else if (status.startsWith(unableToListen)) {
             //: Error message shown after 'Could not connect ... debugger:"
             errorMessage = tr("The port seems to be in use.");
@@ -356,7 +372,7 @@ void QmlEngine::filterApplicationMessage(const QString &msg, int /*channel*/)
         }
     } else if (msg.contains(cannotRetrieveDebuggingOutput)) {
         // we won't get debugging output, so just try to connect ...
-        d->m_adapter.beginConnection();
+        beginConnection();
     }
 }
 
@@ -385,6 +401,7 @@ void QmlEngine::runEngine()
 
     if (!isSlaveEngine() && startParameters().startMode != AttachToRemote)
         startApplicationLauncher();
+    d->m_noDebugOutputTimer.start();
 }
 
 void QmlEngine::startApplicationLauncher()

src/plugins/debugger/qml/qmlengine.h

@@ -126,6 +126,7 @@ signals:
         TextEditor::ITextEditor *editor, int cursorPos);
 
 private slots:
+    void beginConnection();
     void connectionEstablished();
     void connectionStartupFailed();
     void connectionError(QAbstractSocket::SocketError error);

src/plugins/qmlprofiler/qmlprofilerengine.cpp

@@ -54,6 +54,7 @@
 
 #include <QtGui/QMainWindow>
 #include <QtGui/QMessageBox>
+#include <QtCore/QTimer>
 
 using namespace Analyzer;
 using namespace ProjectExplorer;
@@ -83,6 +84,7 @@ public:
     bool m_fetchingData;
     bool m_fetchDataFromStart;
     bool m_delayedDelete;
+    QTimer m_noDebugOutputTimer;
 };
 
 AbstractQmlProfilerRunner *
@@ -135,6 +137,12 @@ QmlProfilerEngine::QmlProfilerEngine(IAnalyzerTool *tool,
     d->m_fetchingData = false;
     d->m_fetchDataFromStart = false;
     d->m_delayedDelete = false;
+
+    // Only wait 4 seconds for the 'Waiting for connection' on application ouput, then just try to connect
+    // (application output might be redirected / blocked)
+    d->m_noDebugOutputTimer.setSingleShot(true);
+    d->m_noDebugOutputTimer.setInterval(4000);
+    connect(&d->m_noDebugOutputTimer, SIGNAL(timeout()), this, SLOT(processIsRunning()));
 }
 
 QmlProfilerEngine::~QmlProfilerEngine()
@@ -174,6 +182,7 @@ bool QmlProfilerEngine::start()
     connect(d->m_runner, SIGNAL(appendMessage(QString,Utils::OutputFormat)),
             this, SLOT(logApplicationMessage(QString,Utils::OutputFormat)));
 
+    d->m_noDebugOutputTimer.start();
     d->m_runner->start();
 
     d->m_running = true;
@@ -248,6 +257,9 @@ void QmlProfilerEngine::filterApplicationMessage(const QString &msg)
 
     const int index = msg.indexOf(qddserver);
     if (index != -1) {
+        // we're actually getting debug output
+        d->m_noDebugOutputTimer.stop();
+
         QString status = msg;
         status.remove(0, index + qddserver.length()); // chop of 'QDeclarativeDebugServer: '
 
@@ -259,7 +271,7 @@ void QmlProfilerEngine::filterApplicationMessage(const QString &msg)
 
         QString errorMessage;
         if (status.startsWith(waitingForConnection)) {
-            emit processRunning(d->m_runner->debugPort());
+            processIsRunning();
         } else if (status.startsWith(unableToListen)) {
             //: Error message shown after 'Could not connect ... debugger:"
             errorMessage = tr("The port seems to be in use.");
@@ -291,7 +303,7 @@ void QmlProfilerEngine::filterApplicationMessage(const QString &msg)
         }
     } else if (msg.contains(cannotRetrieveDebuggingOutput)) {
         // we won't get debugging output, so just try to connect ...
-        emit processRunning(d->m_runner->debugPort());
+        processIsRunning();
     }
 }
 
@@ -323,5 +335,11 @@ void QmlProfilerEngine::showNonmodalWarning(const QString &warningMsg)
     noExecWarning->show();
 }
 
+void QmlProfilerEngine::processIsRunning()
+{
+    d->m_noDebugOutputTimer.stop();
+    emit processRunning(d->m_runner->debugPort());
+}
+
 } // namespace Internal
 } // namespace QmlProfiler

src/plugins/qmlprofiler/qmlprofilerengine.h

@@ -66,6 +66,7 @@ private slots:
     void logApplicationMessage(const QString &msg, Utils::OutputFormat format);
     void filterApplicationMessage(const QString &msg);
     void wrongSetupMessageBoxFinished(int);
+    void processIsRunning();
 
 private:
     class QmlProfilerEnginePrivate;