Revert accidental commit

Revert "Rework threading internals in XmlListModel to avoid global static"

This reverts commit 7a80c5d656e5492dc026cbf643847d7f9c50324a.
(cherry picked from commit d30334bfdf5a05d6ea3c68e4014ce8f8d66f3876)

Reapplied after bad v4.7.4 merge

1 files changed, 91 insertions, 205 deletions

diff --git a/src/declarative/util/qdeclarativexmllistmodel.cpp b/src/declarative/util/qdeclarativexmllistmodel.cpp
index 9a74c04..983a25e 100644
--- a/src/declarative/util/qdeclarativexmllistmodel.cpp
+++ b/src/declarative/util/qdeclarativexmllistmodel.cpp
@@ -147,226 +147,114 @@ struct XmlQueryJob
     QString prefix;
 };
 
-
-class QDeclarativeXmlQueryEngine;
-class QDeclarativeXmlQueryThreadObject : public QObject
+class QDeclarativeXmlQuery : public QObject
 {
     Q_OBJECT
 public:
-    QDeclarativeXmlQueryThreadObject(QDeclarativeXmlQueryEngine *);
-
-    void processJobs();
-    virtual bool event(QEvent *e);
-
-private:
-    QDeclarativeXmlQueryEngine *m_queryEngine;
-};
-
-
-class QDeclarativeXmlQueryEngine : public QThread
-{
-    Q_OBJECT
-public:
-    QDeclarativeXmlQueryEngine(QDeclarativeEngine *eng);
-    ~QDeclarativeXmlQueryEngine();
-
-    int doQuery(QString query, QString namespaces, QByteArray data, QList<QDeclarativeXmlListModelRole *>* roleObjects, QStringList keyRoleResultsCache);
-    void abort(int id);
-
-    void processJobs();
-
-    static QDeclarativeXmlQueryEngine *instance(QDeclarativeEngine *engine);
-
-signals:
-    void queryCompleted(const QDeclarativeXmlQueryResult &);
-    void error(void*, const QString&);
-
-protected:
-    void run();
-
-private:
-    void processQuery(XmlQueryJob *job);
-    void doQueryJob(XmlQueryJob *job, QDeclarativeXmlQueryResult *currentResult);
-    void doSubQueryJob(XmlQueryJob *job, QDeclarativeXmlQueryResult *currentResult);
-    void getValuesOfKeyRoles(const XmlQueryJob& currentJob, QStringList *values, QXmlQuery *query) const;
-    void addIndexToRangeList(QList<QDeclarativeXmlListRange> *ranges, int index) const;
-
-    QMutex m_mutex;
-    QDeclarativeXmlQueryThreadObject *m_threadObject;
-    QList<XmlQueryJob> m_jobs;
-    QSet<int> m_cancelledJobs;
-    QAtomicInt m_queryIds;
-
-    QDeclarativeEngine *m_engine;
-    QObject *m_eventLoopQuitHack;
-
-    static QHash<QDeclarativeEngine *,QDeclarativeXmlQueryEngine*> queryEngines;
-    static QMutex queryEnginesMutex;
-};
-QHash<QDeclarativeEngine *,QDeclarativeXmlQueryEngine*> QDeclarativeXmlQueryEngine::queryEngines;
-QMutex QDeclarativeXmlQueryEngine::queryEnginesMutex;
-
-
-QDeclarativeXmlQueryThreadObject::QDeclarativeXmlQueryThreadObject(QDeclarativeXmlQueryEngine *e)
-    : m_queryEngine(e)
-{
-}
-
-void QDeclarativeXmlQueryThreadObject::processJobs()
-{
-    QCoreApplication::postEvent(this, new QEvent(QEvent::User));
-}
-
-bool QDeclarativeXmlQueryThreadObject::event(QEvent *e)
-{
-    if (e->type() == QEvent::User) {
-        m_queryEngine->processJobs();
-        return true;
-    } else {
-        return QObject::event(e);
+    QDeclarativeXmlQuery(QObject *parent=0)
+        : QObject(parent), m_queryIds(XMLLISTMODEL_CLEAR_ID + 1) {
+        qRegisterMetaType<QDeclarativeXmlQueryResult>("QDeclarativeXmlQueryResult");
+        moveToThread(&m_thread);
+        m_thread.start(QThread::IdlePriority);
     }
-}
-
-
-
-QDeclarativeXmlQueryEngine::QDeclarativeXmlQueryEngine(QDeclarativeEngine *eng)
-: QThread(eng), m_threadObject(0), m_queryIds(XMLLISTMODEL_CLEAR_ID + 1), m_engine(eng), m_eventLoopQuitHack(0)
-{
-    qRegisterMetaType<QDeclarativeXmlQueryResult>("QDeclarativeXmlQueryResult");
-
-    m_eventLoopQuitHack = new QObject;
-    m_eventLoopQuitHack->moveToThread(this);
-    connect(m_eventLoopQuitHack, SIGNAL(destroyed(QObject*)), SLOT(quit()), Qt::DirectConnection);
-    start(QThread::IdlePriority);
-}
-
-QDeclarativeXmlQueryEngine::~QDeclarativeXmlQueryEngine()
-{
-    queryEnginesMutex.lock();
-    queryEngines.remove(m_engine);
-    queryEnginesMutex.unlock();
 
-    m_eventLoopQuitHack->deleteLater();
-    wait();
-}
-
-int QDeclarativeXmlQueryEngine::doQuery(QString query, QString namespaces, QByteArray data, QList<QDeclarativeXmlListModelRole *>* roleObjects, QStringList keyRoleResultsCache) {
-    {
-        QMutexLocker m1(&m_mutex);
-        m_queryIds.ref();
-        if (m_queryIds <= 0)
-            m_queryIds = 1;
-    }
-
-    XmlQueryJob job;
-    job.queryId = m_queryIds;
-    job.data = data;
-    job.query = QLatin1String("doc($src)") + query;
-    job.namespaces = namespaces;
-    job.keyRoleResultsCache = keyRoleResultsCache;
-
-    for (int i=0; i<roleObjects->count(); i++) {
-        if (!roleObjects->at(i)->isValid()) {
-            job.roleQueries << QString();
-            continue;
+    ~QDeclarativeXmlQuery() {
+        if(m_thread.isRunning()) {
+            m_thread.quit();
+            m_thread.wait();
         }
-        job.roleQueries << roleObjects->at(i)->query();
-        job.roleQueryErrorId << static_cast<void*>(roleObjects->at(i));
-        if (roleObjects->at(i)->isKey())
-            job.keyRoleQueries << job.roleQueries.last();
     }
 
-    {
+    void abort(int id) {
         QMutexLocker ml(&m_mutex);
-        m_jobs.append(job);
-        if (m_threadObject)
-            m_threadObject->processJobs();
+        if (id != -1) {
+            m_jobs.remove(id);
+        }
     }
 
-    return job.queryId;
-}
+    int doQuery(QString query, QString namespaces, QByteArray data, QList<QDeclarativeXmlListModelRole *>* roleObjects, QStringList keyRoleResultsCache) {
+        {
+            QMutexLocker m1(&m_mutex);
+            m_queryIds.ref();
+            if (m_queryIds <= 0)
+                m_queryIds = 1;
+        }
 
-void QDeclarativeXmlQueryEngine::abort(int id)
-{
-    QMutexLocker ml(&m_mutex);
-    if (id != -1) {
-        m_cancelledJobs.insert(id);
-        if (m_threadObject)
-            m_threadObject->processJobs();
-    }
-}
+        XmlQueryJob job;
+        job.queryId = m_queryIds;
+        job.data = data;
+        job.query = QLatin1String("doc($src)") + query;
+        job.namespaces = namespaces;
+        job.keyRoleResultsCache = keyRoleResultsCache;
+
+        for (int i=0; i<roleObjects->count(); i++) {
+            if (!roleObjects->at(i)->isValid()) {
+                job.roleQueries << QString();
+                continue;
+            }
+            job.roleQueries << roleObjects->at(i)->query();
+            job.roleQueryErrorId << static_cast<void*>(roleObjects->at(i));
+            if (roleObjects->at(i)->isKey())
+                job.keyRoleQueries << job.roleQueries.last();
+        }
 
-void QDeclarativeXmlQueryEngine::run()
-{
-    m_mutex.lock();
-    m_threadObject = new QDeclarativeXmlQueryThreadObject(this);
-    m_mutex.unlock();
+        {
+            QMutexLocker ml(&m_mutex);
+            m_jobs.insert(m_queryIds, job);
+        }
 
-    processJobs();
-    exec();
+        QMetaObject::invokeMethod(this, "processQuery", Qt::QueuedConnection, Q_ARG(int, job.queryId));
+        return job.queryId;
+    }
 
-    delete m_threadObject;
-    m_threadObject = 0;
-}
+private slots:
+    void processQuery(int queryId) {
+        XmlQueryJob job;
 
-void QDeclarativeXmlQueryEngine::processJobs()
-{
-    QMutexLocker locker(&m_mutex);
+        {
+            QMutexLocker ml(&m_mutex);
+            if (!m_jobs.contains(queryId))
+                return;
+            job = m_jobs.value(queryId);
+        }
 
-    while (true) {
-        if (m_cancelledJobs.isEmpty() && m_jobs.isEmpty())
-            return;
+        QDeclarativeXmlQueryResult result;
+        result.queryId = job.queryId;
+        doQueryJob(&job, &result);
+        doSubQueryJob(&job, &result);
 
-        if (!m_cancelledJobs.isEmpty()) {
-            for (QList<XmlQueryJob>::Iterator it = m_jobs.begin(); it != m_jobs.end(); ++it) {
-                int queryId = (*it).queryId;
-                if (m_cancelledJobs.remove(queryId))
-                    it = m_jobs.erase(it);
+        {
+            QMutexLocker ml(&m_mutex);
+            if (m_jobs.contains(queryId)) {
+                emit queryCompleted(result);
+                m_jobs.remove(queryId);
             }
-            m_cancelledJobs.clear();
         }
+    }
 
-        if (!m_jobs.isEmpty()) {
-            XmlQueryJob currentJob = m_jobs.takeLast();
+Q_SIGNALS:
+    void queryCompleted(const QDeclarativeXmlQueryResult &);
+    void error(void*, const QString&);
 
-            locker.unlock();
-            processQuery(&currentJob);
-            locker.relock();
-        }
-    }
-}
+protected:
 
-QDeclarativeXmlQueryEngine *QDeclarativeXmlQueryEngine::instance(QDeclarativeEngine *engine)
-{
-    queryEnginesMutex.lock();
-    QDeclarativeXmlQueryEngine *queryEng = queryEngines.value(engine);
-    if (!queryEng) {
-        queryEng = new QDeclarativeXmlQueryEngine(engine);
-        queryEngines.insert(engine, queryEng);
-    }
-    queryEnginesMutex.unlock();
 
-    return queryEng;
-}
+private:
+    void doQueryJob(XmlQueryJob *job, QDeclarativeXmlQueryResult *currentResult);
+    void doSubQueryJob(XmlQueryJob *job, QDeclarativeXmlQueryResult *currentResult);
+    void getValuesOfKeyRoles(const XmlQueryJob& currentJob, QStringList *values, QXmlQuery *query) const;
+    void addIndexToRangeList(QList<QDeclarativeXmlListRange> *ranges, int index) const;
 
-void QDeclarativeXmlQueryEngine::processQuery(XmlQueryJob *job)
-{
-    QDeclarativeXmlQueryResult result;
-    result.queryId = job->queryId;
-    doQueryJob(job, &result);
-    doSubQueryJob(job, &result);
+private:
+    QMutex m_mutex;
+    QThread m_thread;
+    QMap<int, XmlQueryJob> m_jobs;
+    QAtomicInt m_queryIds;
+};
 
-    {
-        QMutexLocker ml(&m_mutex);
-        if (m_cancelledJobs.contains(job->queryId)) {
-            m_cancelledJobs.remove(job->queryId);
-        } else {
-            emit queryCompleted(result);
-        }
-    }
-}
+Q_GLOBAL_STATIC(QDeclarativeXmlQuery, globalXmlQuery)
 
-void QDeclarativeXmlQueryEngine::doQueryJob(XmlQueryJob *currentJob, QDeclarativeXmlQueryResult *currentResult)
+void QDeclarativeXmlQuery::doQueryJob(XmlQueryJob *currentJob, QDeclarativeXmlQueryResult *currentResult)
 {
     Q_ASSERT(currentJob->queryId != -1);
 
@@ -405,7 +293,7 @@ void QDeclarativeXmlQueryEngine::doQueryJob(XmlQueryJob *currentJob, QDeclarativ
     currentResult->size = (count > 0 ? count : 0);
 }
 
-void QDeclarativeXmlQueryEngine::getValuesOfKeyRoles(const XmlQueryJob& currentJob, QStringList *values, QXmlQuery *query) const
+void QDeclarativeXmlQuery::getValuesOfKeyRoles(const XmlQueryJob& currentJob, QStringList *values, QXmlQuery *query) const
 {
     const QStringList &keysQueries = currentJob.keyRoleQueries;
     QString keysQuery;
@@ -426,7 +314,7 @@ void QDeclarativeXmlQueryEngine::getValuesOfKeyRoles(const XmlQueryJob& currentJ
     }
 }
 
-void QDeclarativeXmlQueryEngine::addIndexToRangeList(QList<QDeclarativeXmlListRange> *ranges, int index) const {
+void QDeclarativeXmlQuery::addIndexToRangeList(QList<QDeclarativeXmlListRange> *ranges, int index) const {
     if (ranges->isEmpty())
         ranges->append(qMakePair(index, 1));
     else if (ranges->last().first + ranges->last().second == index)
@@ -435,7 +323,7 @@ void QDeclarativeXmlQueryEngine::addIndexToRangeList(QList<QDeclarativeXmlListRa
         ranges->append(qMakePair(index, 1));
 }
 
-void QDeclarativeXmlQueryEngine::doSubQueryJob(XmlQueryJob *currentJob, QDeclarativeXmlQueryResult *currentResult)
+void QDeclarativeXmlQuery::doSubQueryJob(XmlQueryJob *currentJob, QDeclarativeXmlQueryResult *currentResult)
 {
     Q_ASSERT(currentJob->queryId != -1);
 
@@ -695,6 +583,10 @@ void QDeclarativeXmlListModelPrivate::clear_role(QDeclarativeListProperty<QDecla
 QDeclarativeXmlListModel::QDeclarativeXmlListModel(QObject *parent)
     : QListModelInterface(*(new QDeclarativeXmlListModelPrivate), parent)
 {
+    connect(globalXmlQuery(), SIGNAL(queryCompleted(QDeclarativeXmlQueryResult)),
+            this, SLOT(queryCompleted(QDeclarativeXmlQueryResult)));
+    connect(globalXmlQuery(), SIGNAL(error(void*,QString)),
+            this, SLOT(queryError(void*,QString)));
 }
 
 QDeclarativeXmlListModel::~QDeclarativeXmlListModel()
@@ -960,12 +852,6 @@ void QDeclarativeXmlListModel::classBegin()
 {
     Q_D(QDeclarativeXmlListModel);
     d->isComponentComplete = false;
-
-    QDeclarativeXmlQueryEngine *queryEngine = QDeclarativeXmlQueryEngine::instance(qmlEngine(this));
-    connect(queryEngine, SIGNAL(queryCompleted(QDeclarativeXmlQueryResult)),
-            SLOT(queryCompleted(QDeclarativeXmlQueryResult)));
-    connect(queryEngine, SIGNAL(error(void*,QString)),
-            SLOT(queryError(void*,QString)));
 }
 
 void QDeclarativeXmlListModel::componentComplete()
@@ -995,7 +881,7 @@ void QDeclarativeXmlListModel::reload()
     if (!d->isComponentComplete)
         return;
 
-    QDeclarativeXmlQueryEngine::instance(qmlEngine(this))->abort(d->queryId);
+    globalXmlQuery()->abort(d->queryId);
     d->queryId = -1;
 
     if (d->size < 0)
@@ -1011,7 +897,7 @@ void QDeclarativeXmlListModel::reload()
     }
 
     if (!d->xml.isEmpty()) {
-        d->queryId = QDeclarativeXmlQueryEngine::instance(qmlEngine(this))->doQuery(d->query, d->namespaces, d->xml.toUtf8(), &d->roleObjects, d->keyRoleResultsCache);
+        d->queryId = globalXmlQuery()->doQuery(d->query, d->namespaces, d->xml.toUtf8(), &d->roleObjects, d->keyRoleResultsCache);
         d->notifyQueryStarted(false);
 
     } else if (d->src.isEmpty()) {
@@ -1072,7 +958,7 @@ void QDeclarativeXmlListModel::requestFinished()
             d->queryId = XMLLISTMODEL_CLEAR_ID;
             QTimer::singleShot(0, this, SLOT(dataCleared()));
         } else {
-            d->queryId = QDeclarativeXmlQueryEngine::instance(qmlEngine(this))->doQuery(d->query, d->namespaces, data, &d->roleObjects, d->keyRoleResultsCache);
+            d->queryId = globalXmlQuery()->doQuery(d->query, d->namespaces, data, &d->roleObjects, d->keyRoleResultsCache);
         }
         disconnect(d->reply, 0, this, 0);
         d->reply->deleteLater();