ProjectExplorer: Use RAII pattern for parsing start/stop signalling

Change-Id: I13de537140f265db3e3d0ab1cd924d6897cd90c8
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

18 files changed, 143 insertions, 69 deletions

diff --git a/src/plugins/autotoolsprojectmanager/autotoolsproject.cpp b/src/plugins/autotoolsprojectmanager/autotoolsproject.cpp
index fa9c33f46a..6173c33415 100644
--- a/src/plugins/autotoolsprojectmanager/autotoolsproject.cpp
+++ b/src/plugins/autotoolsprojectmanager/autotoolsproject.cpp
@@ -112,7 +112,6 @@ Project::RestoreResult AutotoolsProject::fromMap(const QVariantMap &map, QString
 
 void AutotoolsProject::loadProjectTree()
 {
-    emitParsingStarted();
     if (m_makefileParserThread) {
         // The thread is still busy parsing a previus configuration.
         // Wait until the thread has been finished and delete it.
@@ -125,7 +124,8 @@ void AutotoolsProject::loadProjectTree()
     }
 
     // Parse the makefile asynchronously in a thread
-    m_makefileParserThread = new MakefileParserThread(projectFilePath().toString());
+    m_makefileParserThread = new MakefileParserThread(projectFilePath().toString(),
+                                                      guardParsingRun());
 
     connect(m_makefileParserThread, &MakefileParserThread::started,
             this, &AutotoolsProject::makefileParsingStarted);
@@ -212,8 +212,6 @@ void AutotoolsProject::makefileParsingFinished()
 
     m_makefileParserThread->deleteLater();
     m_makefileParserThread = nullptr;
-
-    emitParsingFinished(true);
 }
 
 void AutotoolsProject::onFileChanged(const QString &file)
diff --git a/src/plugins/autotoolsprojectmanager/makefileparserthread.cpp b/src/plugins/autotoolsprojectmanager/makefileparserthread.cpp
index a33d39599b..fa225f6945 100644
--- a/src/plugins/autotoolsprojectmanager/makefileparserthread.cpp
+++ b/src/plugins/autotoolsprojectmanager/makefileparserthread.cpp
@@ -31,7 +31,10 @@
 
 using namespace AutotoolsProjectManager::Internal;
 
-MakefileParserThread::MakefileParserThread(const QString &makefile) : m_parser(makefile)
+MakefileParserThread::MakefileParserThread(const QString &makefile,
+                                           ProjectExplorer::Project::ParseGuard &&guard)
+    : m_parser(makefile)
+    , m_guard(std::move(guard))
 {
     connect(&m_parser, &MakefileParser::status,
             this, &MakefileParserThread::status);
@@ -82,7 +85,7 @@ QStringList MakefileParserThread::cxxflags() const
 bool MakefileParserThread::hasError() const
 {
     QMutexLocker locker(&m_mutex);
-    return m_hasError;
+    return !m_guard.isSuccess();
 }
 
 bool MakefileParserThread::isCanceled() const
@@ -104,7 +107,8 @@ void MakefileParserThread::run()
     // this prevents long locks if the caller reads a value before the signal
     // finished() has been emitted.
     QMutexLocker locker(&m_mutex);
-    m_hasError = !success;
+    if (success)
+        m_guard.markAsSuccess();
     m_executable = m_parser.executable();
     m_sources = m_parser.sources();
     m_makefiles = m_parser.makefiles();
diff --git a/src/plugins/autotoolsprojectmanager/makefileparserthread.h b/src/plugins/autotoolsprojectmanager/makefileparserthread.h
index fa300e8d35..63d86190e2 100644
--- a/src/plugins/autotoolsprojectmanager/makefileparserthread.h
+++ b/src/plugins/autotoolsprojectmanager/makefileparserthread.h
@@ -29,6 +29,7 @@
 
 #include "makefileparser.h"
 
+#include <projectexplorer/project.h>
 #include <projectexplorer/projectmacro.h>
 
 #include <QMutex>
@@ -53,7 +54,7 @@ class MakefileParserThread : public QThread
     using Macros = ProjectExplorer::Macros;
 
 public:
-    MakefileParserThread(const QString &makefile);
+    MakefileParserThread(const QString &makefile, ProjectExplorer::Project::ParseGuard &&guard);
 
     /** @see QThread::run() */
     void run() override;
@@ -134,7 +135,6 @@ private:
     MakefileParser m_parser;    ///< Is not accessible outside the thread
 
     mutable QMutex m_mutex;
-    bool m_hasError = false;    ///< Return value for MakefileParserThread::hasError()
     QString m_executable;       ///< Return value for MakefileParserThread::executable()
     QStringList m_sources;      ///< Return value for MakefileParserThread::sources()
     QStringList m_makefiles;    ///< Return value for MakefileParserThread::makefiles()
@@ -142,6 +142,8 @@ private:
     Macros m_macros;            ///< Return value for MakefileParserThread::macros()
     QStringList m_cflags;       ///< Return value for MakefileParserThread::cflags()
     QStringList m_cxxflags;     ///< Return value for MakefileParserThread::cxxflags()
+
+    ProjectExplorer::Project::ParseGuard m_guard;
 };
 
 } // namespace Internal
diff --git a/src/plugins/cmakeprojectmanager/cmakeproject.cpp b/src/plugins/cmakeprojectmanager/cmakeproject.cpp
index f7fd54feac..bbfcd41f66 100644
--- a/src/plugins/cmakeprojectmanager/cmakeproject.cpp
+++ b/src/plugins/cmakeprojectmanager/cmakeproject.cpp
@@ -371,7 +371,7 @@ void CMakeProject::startParsing(int reparseParameters)
     CMakeBuildConfiguration *bc = activeBc(this);
     QTC_ASSERT(bc, return );
 
-    emitParsingStarted();
+    m_parseGuard = std::move(guardParsingRun());
 
     m_waitingForScan = reparseParameters & BuildDirManager::REPARSE_SCAN;
     m_waitingForParse = true;
@@ -466,12 +466,14 @@ void CMakeProject::combineScanAndParse(CMakeBuildConfiguration *bc)
     if (m_waitingForParse || m_waitingForScan)
         return;
 
-    if (m_combinedScanAndParseResult)
+    if (m_combinedScanAndParseResult) {
+        m_parseGuard.markAsSuccess();
         updateProjectData(bc);
+    }
 
     {
         TraceTimer parsingDoneTimer("    parsing finished signal");
-        emitParsingFinished(m_combinedScanAndParseResult);
+        m_parseGuard = {};
     }
 }
 
diff --git a/src/plugins/cmakeprojectmanager/cmakeproject.h b/src/plugins/cmakeprojectmanager/cmakeproject.h
index dd84b2724a..645deacf8d 100644
--- a/src/plugins/cmakeprojectmanager/cmakeproject.h
+++ b/src/plugins/cmakeprojectmanager/cmakeproject.h
@@ -121,6 +121,8 @@ private:
     QTimer m_delayedParsingTimer;
     int m_delayedParsingParameters = 0;
 
+    ParseGuard m_parseGuard;
+
     friend class Internal::CMakeBuildConfiguration;
     friend class Internal::CMakeBuildSettingsWidget;
 };
diff --git a/src/plugins/compilationdatabaseprojectmanager/compilationdatabaseproject.cpp b/src/plugins/compilationdatabaseprojectmanager/compilationdatabaseproject.cpp
index a2d99b276e..a601f3d3a9 100644
--- a/src/plugins/compilationdatabaseprojectmanager/compilationdatabaseproject.cpp
+++ b/src/plugins/compilationdatabaseprojectmanager/compilationdatabaseproject.cpp
@@ -450,17 +450,18 @@ void CompilationDatabaseProject::reparseProject()
     if (m_parser) {
         QTC_CHECK(isParsing());
         m_parser->stop();
-        emitParsingFinished(false);
     }
-    m_parser = new CompilationDbParser(displayName(), projectFilePath(), rootPathFromSettings(),
-                                       m_mimeBinaryCache, this);
+    m_parser = new CompilationDbParser(displayName(),
+                                       projectFilePath(),
+                                       rootPathFromSettings(),
+                                       m_mimeBinaryCache,
+                                       guardParsingRun(),
+                                       this);
     connect(m_parser, &CompilationDbParser::finished, this, [this](bool success) {
         if (success)
             buildTreeAndProjectParts();
         m_parser = nullptr;
-        emitParsingFinished(success);
     });
-    emitParsingStarted();
     m_parser->start();
 }
 
diff --git a/src/plugins/compilationdatabaseprojectmanager/compilationdbparser.cpp b/src/plugins/compilationdatabaseprojectmanager/compilationdbparser.cpp
index d75bf7be40..6c91311898 100644
--- a/src/plugins/compilationdatabaseprojectmanager/compilationdbparser.cpp
+++ b/src/plugins/compilationdatabaseprojectmanager/compilationdbparser.cpp
@@ -43,14 +43,18 @@ using namespace Utils;
 namespace CompilationDatabaseProjectManager {
 namespace Internal {
 
-CompilationDbParser::CompilationDbParser(const QString &projectName, const FilePath &projectPath,
-                                         const FilePath &rootPath, MimeBinaryCache &mimeBinaryCache,
+CompilationDbParser::CompilationDbParser(const QString &projectName,
+                                         const FilePath &projectPath,
+                                         const FilePath &rootPath,
+                                         MimeBinaryCache &mimeBinaryCache,
+                                         ProjectExplorer::Project::ParseGuard &&guard,
                                          QObject *parent)
-    : QObject(parent),
-      m_projectName(projectName),
-      m_projectFilePath(projectPath),
-      m_rootPath(rootPath),
-      m_mimeBinaryCache(mimeBinaryCache)
+    : QObject(parent)
+    , m_projectName(projectName)
+    , m_projectFilePath(projectPath)
+    , m_rootPath(rootPath)
+    , m_mimeBinaryCache(mimeBinaryCache)
+    , m_guard(std::move(guard))
 {
     connect(&m_parserWatcher, &QFutureWatcher<void>::finished, this, [this] {
         m_dbContents = m_parserWatcher.result();
@@ -112,6 +116,7 @@ void CompilationDbParser::stop()
         m_treeScanner->disconnect();
         m_treeScanner->future().cancel();
     }
+    m_guard = {};
     deleteLater();
 }
 
diff --git a/src/plugins/compilationdatabaseprojectmanager/compilationdbparser.h b/src/plugins/compilationdatabaseprojectmanager/compilationdbparser.h
index ded713d590..fe3e319076 100644
--- a/src/plugins/compilationdatabaseprojectmanager/compilationdbparser.h
+++ b/src/plugins/compilationdatabaseprojectmanager/compilationdbparser.h
@@ -27,6 +27,8 @@
 
 #include "compilationdatabaseutils.h"
 
+#include <projectexplorer/project.h>
+
 #include <utils/fileutils.h>
 
 #include <QFutureWatcher>
@@ -48,15 +50,22 @@ class CompilationDbParser : public QObject
 {
     Q_OBJECT
 public:
-    explicit CompilationDbParser(const QString &projectName, const Utils::FilePath &projectPath,
-                                 const Utils::FilePath &rootPath, MimeBinaryCache &mimeBinaryCache,
+    explicit CompilationDbParser(const QString &projectName,
+                                 const Utils::FilePath &projectPath,
+                                 const Utils::FilePath &rootPath,
+                                 MimeBinaryCache &mimeBinaryCache,
+                                 ProjectExplorer::Project::ParseGuard &&guard,
                                  QObject *parent = nullptr);
 
     void start();
     void stop();
 
     QList<ProjectExplorer::FileNode *> scannedFiles() const;
-    DbContents dbContents() const { return m_dbContents; }
+    DbContents dbContents() const
+    {
+        m_guard.markAsSuccess();
+        return m_dbContents;
+    }
 
 signals:
     void finished(bool success);
@@ -72,6 +81,8 @@ private:
     ProjectExplorer::TreeScanner *m_treeScanner = nullptr;
     QFutureWatcher<DbContents> m_parserWatcher;
     DbContents m_dbContents;
+
+    ProjectExplorer::Project::ParseGuard m_guard;
 };
 
 } // namespace Internal
diff --git a/src/plugins/genericprojectmanager/genericproject.cpp b/src/plugins/genericprojectmanager/genericproject.cpp
index ce4172abed..e25fa77eb8 100644
--- a/src/plugins/genericprojectmanager/genericproject.cpp
+++ b/src/plugins/genericprojectmanager/genericproject.cpp
@@ -409,7 +409,7 @@ FilePath GenericProject::findCommonSourceRoot()
 
 void GenericProject::refresh(RefreshOptions options)
 {
-    emitParsingStarted();
+    ParseGuard guard = guardParsingRun();
     parseProject(options);
 
     if (options & Files) {
@@ -442,7 +442,7 @@ void GenericProject::refresh(RefreshOptions options)
 
     refreshCppCodeModel();
     updateDeploymentData();
-    emitParsingFinished(true);
+    guard.markAsSuccess();
 }
 
 /**
diff --git a/src/plugins/nim/project/nimproject.cpp b/src/plugins/nim/project/nimproject.cpp
index a6cad1657f..9a732f92ae 100644
--- a/src/plugins/nim/project/nimproject.cpp
+++ b/src/plugins/nim/project/nimproject.cpp
@@ -135,7 +135,7 @@ void NimProject::collectProjectFiles()
 
 void NimProject::updateProject()
 {
-    emitParsingStarted();
+    ParseGuard guard = guardParsingRun();
 
     auto newRoot = std::make_unique<NimProjectNode>(*this, projectDirectory());
 
@@ -147,7 +147,7 @@ void NimProject::updateProject()
     newRoot->setDisplayName(displayName());
     setRootProjectNode(std::move(newRoot));
 
-    emitParsingFinished(true);
+    guard.markAsSuccess();
 }
 
 Tasks NimProject::projectIssues(const Kit *k) const
diff --git a/src/plugins/projectexplorer/project.cpp b/src/plugins/projectexplorer/project.cpp
index b18ba3f6bc..879fedcb0d 100644
--- a/src/plugins/projectexplorer/project.cpp
+++ b/src/plugins/projectexplorer/project.cpp
@@ -1014,15 +1014,6 @@ public:
         setDisplayName(TEST_PROJECT_DISPLAYNAME);
     }
 
-    void testStartParsing()
-    {
-        emitParsingStarted();
-    }
-
-    void testParsingFinished(bool success) {
-        emitParsingFinished(success);
-    }
-
     bool needsConfiguration() const final { return false; }
 };
 
@@ -1081,14 +1072,17 @@ void ProjectExplorerPlugin::testProject_parsingSuccess()
     QSignalSpy startSpy(&project, &Project::parsingStarted);
     QSignalSpy stopSpy(&project, &Project::parsingFinished);
 
-    project.testStartParsing();
-    QCOMPARE(startSpy.count(), 1);
-    QCOMPARE(stopSpy.count(), 0);
+    {
+        Project::ParseGuard guard = project.guardParsingRun();
+        QCOMPARE(startSpy.count(), 1);
+        QCOMPARE(stopSpy.count(), 0);
 
-    QVERIFY(project.isParsing());
-    QVERIFY(!project.hasParsingData());
+        QVERIFY(project.isParsing());
+        QVERIFY(!project.hasParsingData());
+
+        guard.markAsSuccess();
+    }
 
-    project.testParsingFinished(true);
     QCOMPARE(startSpy.count(), 1);
     QCOMPARE(stopSpy.count(), 1);
     QCOMPARE(stopSpy.at(0), {QVariant(true)});
@@ -1104,14 +1098,15 @@ void ProjectExplorerPlugin::testProject_parsingFail()
     QSignalSpy startSpy(&project, &Project::parsingStarted);
     QSignalSpy stopSpy(&project, &Project::parsingFinished);
 
-    project.testStartParsing();
-    QCOMPARE(startSpy.count(), 1);
-    QCOMPARE(stopSpy.count(), 0);
+    {
+        Project::ParseGuard guard = project.guardParsingRun();
+        QCOMPARE(startSpy.count(), 1);
+        QCOMPARE(stopSpy.count(), 0);
 
-    QVERIFY(project.isParsing());
-    QVERIFY(!project.hasParsingData());
+        QVERIFY(project.isParsing());
+        QVERIFY(!project.hasParsingData());
+    }
 
-    project.testParsingFinished(false);
     QCOMPARE(startSpy.count(), 1);
     QCOMPARE(stopSpy.count(), 1);
     QCOMPARE(stopSpy.at(0), {QVariant(false)});
diff --git a/src/plugins/projectexplorer/project.h b/src/plugins/projectexplorer/project.h
index 1eeece2646..b5de003a53 100644
--- a/src/plugins/projectexplorer/project.h
+++ b/src/plugins/projectexplorer/project.h
@@ -204,6 +204,51 @@ public:
     bool needsInitialExpansion() const;
     void setNeedsInitialExpansion(bool needsInitialExpansion);
 
+    class ParseGuard
+    {
+    public:
+        ParseGuard()
+            : ParseGuard(nullptr)
+        {}
+
+        ~ParseGuard()
+        {
+            if (m_project)
+                m_project->emitParsingFinished(m_success);
+        }
+
+        void markAsSuccess() const { m_success = true; }
+        bool isSuccess() const { return m_success; }
+        bool isNull() const { return !m_project; }
+
+        ParseGuard(const ParseGuard &other) = delete;
+        ParseGuard &operator=(const ParseGuard &other) = delete;
+        ParseGuard(ParseGuard &&other)
+        {
+            std::swap(m_project, other.m_project);
+            std::swap(m_success, other.m_success);
+        }
+        ParseGuard &operator=(ParseGuard &&other)
+        {
+            std::swap(m_project, other.m_project);
+            std::swap(m_success, other.m_success);
+            return *this;
+        }
+
+    private:
+        ParseGuard(Project *p)
+            : m_project(p)
+        {
+            if (m_project)
+                m_project->emitParsingStarted();
+        }
+
+        Project *m_project = nullptr;
+        mutable bool m_success = false;
+
+        friend class Project;
+    };
+
 signals:
     void displayNameChanged();
     void fileListChanged();
@@ -235,16 +280,12 @@ signals:
     void rootProjectDirectoryChanged();
 
 protected:
+    ParseGuard guardParsingRun() { return ParseGuard(this); }
+
     virtual RestoreResult fromMap(const QVariantMap &map, QString *errorMessage);
     void createTargetFromMap(const QVariantMap &map, int index);
     virtual bool setupTarget(Target *t);
 
-    // Helper methods to manage parsing state and signalling
-    // Call in GUI thread before the actual parsing starts
-    void emitParsingStarted();
-    // Call in GUI thread right after the actual parsing is done
-    void emitParsingFinished(bool success);
-
     void setDisplayName(const QString &name);
     // Used to pre-check kits in the TargetSetupPage. RequiredKitPredicate
     // is used to select kits available in the TargetSetupPage
@@ -270,6 +311,12 @@ protected:
     Utils::Environment activeBuildEnvironment() const;
 
 private:
+    // Helper methods to manage parsing state and signalling
+    // Call in GUI thread before the actual parsing starts
+    void emitParsingStarted();
+    // Call in GUI thread right after the actual parsing is done
+    void emitParsingFinished(bool success);
+
     void addTarget(std::unique_ptr<Target> &&target);
 
     void handleSubTreeChanged(FolderNode *node);
diff --git a/src/plugins/python/pythonplugin.cpp b/src/plugins/python/pythonplugin.cpp
index 657e6269bc..0aae69d905 100644
--- a/src/plugins/python/pythonplugin.cpp
+++ b/src/plugins/python/pythonplugin.cpp
@@ -634,7 +634,7 @@ private:
 
 void PythonProject::refresh(Target *target)
 {
-    emitParsingStarted();
+    ParseGuard guard = guardParsingRun();
     parseProject();
 
     const QDir baseDir(projectDirectory().toString());
@@ -661,7 +661,7 @@ void PythonProject::refresh(Target *target)
     if (target)
         target->setApplicationTargets(appTargets);
 
-    emitParsingFinished(true);
+    guard.markAsSuccess();
 }
 
 /**
diff --git a/src/plugins/qbsprojectmanager/qbsproject.cpp b/src/plugins/qbsprojectmanager/qbsproject.cpp
index f9607429e7..684c83648f 100644
--- a/src/plugins/qbsprojectmanager/qbsproject.cpp
+++ b/src/plugins/qbsprojectmanager/qbsproject.cpp
@@ -463,7 +463,7 @@ bool QbsProject::checkCancelStatus()
     qCDebug(qbsPmLog) << "Cancel request while parsing, starting re-parse";
     m_qbsProjectParser->deleteLater();
     m_qbsProjectParser = nullptr;
-    emitParsingFinished(false);
+    m_guard = {};
     parseCurrentBuildConfiguration();
     return true;
 }
@@ -551,7 +551,8 @@ void QbsProject::handleQbsParsingDone(bool success)
         updateAfterParse();
     else if (envChanged)
         updateCppCodeModel();
-    emitParsingFinished(success);
+    m_guard.markAsSuccess();
+    m_guard = {};
 }
 
 void QbsProject::rebuildProjectTree()
@@ -729,6 +730,8 @@ void QbsProject::configureAsExampleProject()
 void QbsProject::parse(const QVariantMap &config, const Environment &env, const QString &dir,
                        const QString &configName)
 {
+    m_guard = guardParsingRun();
+
     prepareForParsing();
     QTC_ASSERT(!m_qbsProjectParser, return);
 
@@ -736,7 +739,6 @@ void QbsProject::parse(const QVariantMap &config, const Environment &env, const
 
     QbsManager::updateProfileIfNecessary(activeTarget()->kit());
     m_qbsProjectParser->parse(config, env, dir, configName);
-    emitParsingStarted();
 }
 
 void QbsProject::prepareForParsing()
diff --git a/src/plugins/qbsprojectmanager/qbsproject.h b/src/plugins/qbsprojectmanager/qbsproject.h
index fba99a5f90..c4afe84de2 100644
--- a/src/plugins/qbsprojectmanager/qbsproject.h
+++ b/src/plugins/qbsprojectmanager/qbsproject.h
@@ -167,6 +167,8 @@ private:
     bool m_extraCompilersPending = false;
 
     QHash<QString, Utils::Environment> m_envCache;
+
+    ParseGuard m_guard;
 };
 
 } // namespace Internal
diff --git a/src/plugins/qmakeprojectmanager/qmakeproject.cpp b/src/plugins/qmakeprojectmanager/qmakeproject.cpp
index 281f88de57..3e5496b546 100644
--- a/src/plugins/qmakeprojectmanager/qmakeproject.cpp
+++ b/src/plugins/qmakeprojectmanager/qmakeproject.cpp
@@ -438,15 +438,15 @@ void QmakeProject::startAsyncTimer(QmakeProFile::AsyncUpdateDelay delay)
     m_asyncUpdateTimer.stop();
     m_asyncUpdateTimer.setInterval(qMin(m_asyncUpdateTimer.interval(),
                                         delay == QmakeProFile::ParseLater ? UPDATE_INTERVAL : 0));
-    if (!isParsing())
-        emitParsingStarted();
+
     m_asyncUpdateTimer.start();
 }
 
 void QmakeProject::incrementPendingEvaluateFutures()
 {
+    if (m_pendingEvaluateFuturesCount == 0)
+        m_guard = guardParsingRun();
     ++m_pendingEvaluateFuturesCount;
-    QTC_ASSERT(isParsing(), emitParsingStarted());
     m_asyncUpdateFutureInterface->setProgressRange(m_asyncUpdateFutureInterface->progressMinimum(),
                                                    m_asyncUpdateFutureInterface->progressMaximum() + 1);
 }
@@ -486,7 +486,8 @@ void QmakeProject::decrementPendingEvaluateFutures()
             updateBuildSystemData();
             if (activeTarget())
                 activeTarget()->updateDefaultDeployConfigurations();
-            emitParsingFinished(true); // Qmake always returns (some) data, even when it failed:-)
+            m_guard.markAsSuccess(); // Qmake always returns (some) data, even when it failed:-)
+            m_guard = {};
         }
     }
 }
diff --git a/src/plugins/qmakeprojectmanager/qmakeproject.h b/src/plugins/qmakeprojectmanager/qmakeproject.h
index 4c3169716b..584e16a15e 100644
--- a/src/plugins/qmakeprojectmanager/qmakeproject.h
+++ b/src/plugins/qmakeprojectmanager/qmakeproject.h
@@ -179,6 +179,8 @@ private:
 
     ProjectExplorer::Target *m_activeTarget = nullptr;
     mutable ProjectExplorer::ProjectImporter *m_projectImporter = nullptr;
+
+    ParseGuard m_guard;
 };
 
 } // namespace QmakeProjectManager
diff --git a/src/plugins/qmlprojectmanager/qmlproject.cpp b/src/plugins/qmlprojectmanager/qmlproject.cpp
index 2dd251d2a5..8bfc42911e 100644
--- a/src/plugins/qmlprojectmanager/qmlproject.cpp
+++ b/src/plugins/qmlprojectmanager/qmlproject.cpp
@@ -152,7 +152,7 @@ void QmlProject::parseProject(RefreshOptions options)
 
 void QmlProject::refresh(RefreshOptions options)
 {
-    emitParsingStarted();
+    ParseGuard guard = guardParsingRun();
     parseProject(options);
 
     if (options & Files)
@@ -170,7 +170,7 @@ void QmlProject::refresh(RefreshOptions options)
 
     modelManager->updateProjectInfo(projectInfo, this);
 
-    emitParsingFinished(true);
+    guard.markAsSuccess();
 }
 
 QString QmlProject::mainFile() const