use progressdialog and QtConcurrent in order to create documentProxies structure (improving performances in a network-storage context)

OpenBoard.pro

@@ -40,6 +40,7 @@ QT += webkitwidgets
 QT += multimediawidgets
 QT += printsupport
 QT += core
+QT += concurrent
 
 INCLUDEPATH += src
 

src/core/UBPersistenceManager.cpp

@@ -34,6 +34,7 @@
 #include <QDomDocument>
 #include <QXmlStreamWriter>
 #include <QModelIndex>
+#include <QtConcurrent>
 
 #include "frameworks/UBPlatformUtils.h"
 #include "frameworks/UBFileSystemUtils.h"
@@ -98,7 +99,6 @@ UBPersistenceManager::UBPersistenceManager(QObject *pParent)
     mDocumentTreeStructureModel = new UBDocumentTreeModel(this);
     createDocumentProxiesStructure();
 
-
     emit proxyListChanged();
 }
 
@@ -131,7 +131,27 @@ void UBPersistenceManager::createDocumentProxiesStructure(bool interactive)
     rootDir.mkpath(rootDir.path());
 
     QFileInfoList contentList = rootDir.entryInfoList(QDir::Dirs | QDir::NoDotAndDotDot, QDir::Time | QDir::Reversed);
-    createDocumentProxiesStructure(contentList, interactive);
+
+    mProgress.setWindowFlags(Qt::Window | Qt::WindowTitleHint | Qt::CustomizeWindowHint);
+    mProgress.setLabelText(QString("retrieving all your documents (found %1)").arg(contentList.size()));
+    mProgress.setCancelButton(nullptr);
+
+    // Create a QFutureWatcher and connect signals and slots.
+    QFutureWatcher<void> futureWatcher;
+    QObject::connect(&futureWatcher, &QFutureWatcher<void>::finished, &mProgress, &QProgressDialog::reset);
+    QObject::connect(&futureWatcher,  &QFutureWatcher<void>::progressRangeChanged, &mProgress, &QProgressDialog::setRange);
+    QObject::connect(&futureWatcher, &QFutureWatcher<void>::progressValueChanged,  &mProgress, &QProgressDialog::setValue);
+
+    // Start the computation.
+    futureWatcher.setFuture(QtConcurrent::map(contentList, [=] (QFileInfo& contentInfo)
+    {
+        createDocumentProxyStructure(contentInfo);
+    }));
+
+    // Display the dialog and start the event loop.
+    mProgress.exec();
+
+    futureWatcher.waitForFinished();
 
     if (QFileInfo(mFoldersXmlStorageName).exists()) {
         QDomDocument xmlDom;
@@ -158,12 +178,17 @@ void UBPersistenceManager::createDocumentProxiesStructure(bool interactive)
     }
 }
 
-void UBPersistenceManager::createDocumentProxiesStructure(const QFileInfoList &contentInfo, bool interactive)
+void UBPersistenceManager::createDocumentProxiesStructure(const QFileInfoList &contentInfoList, bool interactive)
 {
-    foreach(QFileInfo path, contentInfo)
+    foreach(QFileInfo contentInfo, contentInfoList)
     {
-        QString fullPath = path.absoluteFilePath();
+        createDocumentProxyStructure(contentInfo, interactive);
+    }
+}
 
+void UBPersistenceManager::createDocumentProxyStructure(const QFileInfo &contentInfo, bool interactive)
+{
+    QString fullPath = contentInfo.absoluteFilePath();
     QDir dir(fullPath);
 
     if (dir.entryList(QDir::Files | QDir::NoDotAndDotDot).size() > 0)
@@ -174,7 +199,7 @@ void UBPersistenceManager::createDocumentProxiesStructure(const QFileInfoList &c
 
         if (docName.isEmpty()) {
             qDebug() << "Group name and document name are empty in UBPersistenceManager::createDocumentProxiesStructure()";
-                continue;
+            return;
         }
 
         QModelIndex parentIndex = mDocumentTreeStructureModel->goTo(docGroupName);
@@ -194,8 +219,7 @@ void UBPersistenceManager::createDocumentProxiesStructure(const QFileInfoList &c
         else
             processInteractiveReplacementDialog(docProxy);
     }
-    }
-}
+};
 
 QDialog::DialogCode UBPersistenceManager::processInteractiveReplacementDialog(UBDocumentProxy *pProxy)
 {

src/core/UBPersistenceManager.h

@@ -131,7 +131,8 @@ class UBPersistenceManager : public QObject
         bool addDirectoryContentToDocument(const QString& documentRootFolder, UBDocumentProxy* pDocument);
 
         void createDocumentProxiesStructure(bool interactive = false);
-        void createDocumentProxiesStructure(const QFileInfoList &contentInfo, bool interactive = false);
+        void createDocumentProxiesStructure(const QFileInfoList &contentInfoList, bool interactive = false);
+        void createDocumentProxyStructure(const QFileInfo& contentInfo, bool interactive = false);
         QDialog::DialogCode processInteractiveReplacementDialog(UBDocumentProxy *pProxy);
 
         QStringList documentSubDirectories()
@@ -187,6 +188,8 @@ private:
         bool mHasPurgedDocuments;
         QString mDocumentRepositoryPath;
         QString mFoldersXmlStorageName;
+        QProgressDialog mProgress;
+        QFutureWatcher<void> futureWatcher;
 
     private slots:
         void documentRepositoryChanged(const QString& path);