/
qqmltypeloader.cpp
1964 lines (1626 loc) · 57.1 KB
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qqmltypeloader.cpp
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/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/
**
** This file is part of the QtQml module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** This file may be used under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation and
** appearing in the file LICENSE.LGPL included in the packaging of this
** file. Please review the following information to ensure the GNU Lesser
** General Public License version 2.1 requirements will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of this
** file. Please review the following information to ensure the GNU General
** Public License version 3.0 requirements will be met:
** http://www.gnu.org/copyleft/gpl.html.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qqmltypeloader_p.h"
#include <private/qqmlengine_p.h>
#include <private/qqmlglobal_p.h>
#include <private/qqmlthread_p.h>
#include <private/qqmlcompiler_p.h>
#include <private/qqmlcomponent_p.h>
#include <private/qqmlprofilerservice_p.h>
#include <QtCore/qdir.h>
#include <QtCore/qfile.h>
#include <QtCore/qdebug.h>
#include <QtCore/qmutex.h>
#include <QtCore/qthread.h>
#include <QtCore/qdiriterator.h>
#include <QtCore/qwaitcondition.h>
#include <QtQml/qqmlcomponent.h>
#include <QtQml/qqmlextensioninterface.h>
#if defined (Q_OS_UNIX)
#include <sys/types.h>
#include <dirent.h>
#endif
#if defined (QT_LINUXBASE)
// LSB doesn't declare NAME_MAX. Use SYMLINK_MAX instead, which seems to
// always be identical to NAME_MAX
#ifndef NAME_MAX
# define NAME_MAX _POSIX_SYMLINK_MAX
#endif
// LSB has a broken version of offsetof that can't be used at compile time
// https://lsbbugs.linuxfoundation.org/show_bug.cgi?id=3462
#undef offsetof
#define offsetof(TYPE, MEMBER) __builtin_offsetof (TYPE, MEMBER)
#endif
// #define DATABLOB_DEBUG
#ifdef DATABLOB_DEBUG
#define ASSERT_MAINTHREAD() do { if(m_thread->isThisThread()) qFatal("QQmlDataLoader: Caller not in main thread"); } while(false)
#define ASSERT_LOADTHREAD() do { if(!m_thread->isThisThread()) qFatal("QQmlDataLoader: Caller not in load thread"); } while(false)
#define ASSERT_CALLBACK() do { if(!m_manager || !m_manager->m_thread->isThisThread()) qFatal("QQmlDataBlob: An API call was made outside a callback"); } while(false)
#else
#define ASSERT_MAINTHREAD()
#define ASSERT_LOADTHREAD()
#define ASSERT_CALLBACK()
#endif
QT_BEGIN_NAMESPACE
// This is a lame object that we need to ensure that slots connected to
// QNetworkReply get called in the correct thread (the loader thread).
// As QQmlDataLoader lives in the main thread, and we can't use
// Qt::DirectConnection connections from a QNetworkReply (because then
// sender() wont work), we need to insert this object in the middle.
class QQmlDataLoaderNetworkReplyProxy : public QObject
{
Q_OBJECT
public:
QQmlDataLoaderNetworkReplyProxy(QQmlDataLoader *l);
public slots:
void finished();
void downloadProgress(qint64, qint64);
private:
QQmlDataLoader *l;
};
class QQmlDataLoaderThread : public QQmlThread
{
typedef QQmlDataLoaderThread This;
public:
QQmlDataLoaderThread(QQmlDataLoader *loader);
QNetworkAccessManager *networkAccessManager() const;
QQmlDataLoaderNetworkReplyProxy *networkReplyProxy() const;
void load(QQmlDataBlob *b);
void loadAsync(QQmlDataBlob *b);
void loadWithStaticData(QQmlDataBlob *b, const QByteArray &);
void loadWithStaticDataAsync(QQmlDataBlob *b, const QByteArray &);
void callCompleted(QQmlDataBlob *b);
void callDownloadProgressChanged(QQmlDataBlob *b, qreal p);
void initializeEngine(QQmlExtensionInterface *, const char *);
protected:
virtual void shutdownThread();
private:
void loadThread(QQmlDataBlob *b);
void loadWithStaticDataThread(QQmlDataBlob *b, const QByteArray &);
void callCompletedMain(QQmlDataBlob *b);
void callDownloadProgressChangedMain(QQmlDataBlob *b, qreal p);
void initializeEngineMain(QQmlExtensionInterface *iface, const char *uri);
QQmlDataLoader *m_loader;
mutable QNetworkAccessManager *m_networkAccessManager;
mutable QQmlDataLoaderNetworkReplyProxy *m_networkReplyProxy;
};
QQmlDataLoaderNetworkReplyProxy::QQmlDataLoaderNetworkReplyProxy(QQmlDataLoader *l)
: l(l)
{
}
void QQmlDataLoaderNetworkReplyProxy::finished()
{
Q_ASSERT(sender());
Q_ASSERT(qobject_cast<QNetworkReply *>(sender()));
QNetworkReply *reply = static_cast<QNetworkReply *>(sender());
l->networkReplyFinished(reply);
}
void QQmlDataLoaderNetworkReplyProxy::downloadProgress(qint64 bytesReceived, qint64 bytesTotal)
{
Q_ASSERT(sender());
Q_ASSERT(qobject_cast<QNetworkReply *>(sender()));
QNetworkReply *reply = static_cast<QNetworkReply *>(sender());
l->networkReplyProgress(reply, bytesReceived, bytesTotal);
}
/*
Returns the set of QML files in path (qmldir, *.qml, *.js). The caller
is responsible for deleting the returned data.
Returns 0 if the directory does not exist.
*/
#if defined (Q_OS_UNIX) && !defined(Q_OS_DARWIN)
static QStringHash<bool> *qmlFilesInDirectory(const QString &path)
{
QByteArray name(QFile::encodeName(path));
DIR *dd = opendir(name);
if (!dd)
return 0;
struct dirent *result;
union {
struct dirent d;
char b[offsetof (struct dirent, d_name) + NAME_MAX + 1];
} u;
QStringHash<bool> *files = new QStringHash<bool>;
while (readdir_r(dd, &u.d, &result) == 0 && result != 0) {
if (!strcmp(u.d.d_name, "qmldir")) {
files->insert(QLatin1String("qmldir"), true);
continue;
}
int len = strlen(u.d.d_name);
if (len < 4)
continue;
if (!strcmp(u.d.d_name+len-4, ".qml") || !strcmp(u.d.d_name+len-3, ".js"))
files->insert(QFile::decodeName(u.d.d_name), true);
#if defined(Q_OS_DARWIN)
else if ((len > 6 && !strcmp(u.d.d_name+len-6, ".dylib")) || !strcmp(u.d.d_name+len-3, ".so")
|| (len > 7 && !strcmp(u.d.d_name+len-7, ".bundle")))
files->insert(QFile::decodeName(u.d.d_name), true);
#else // Unix
else if (!strcmp(u.d.d_name+len-3, ".so") || !strcmp(u.d.d_name+len-3, ".sl"))
files->insert(QFile::decodeName(u.d.d_name), true);
#endif
}
closedir(dd);
return files;
}
#else
static QStringHash<bool> *qmlFilesInDirectory(const QString &path)
{
QDirIterator dir(path, QDir::Files);
if (!dir.hasNext())
return 0;
QStringHash<bool> *files = new QStringHash<bool>;
while (dir.hasNext()) {
dir.next();
QString fileName = dir.fileName();
if (fileName == QLatin1String("qmldir")
|| fileName.endsWith(QLatin1String(".qml"))
|| fileName.endsWith(QLatin1String(".js"))
#if defined(Q_OS_WIN32) || defined(Q_OS_WINCE)
|| fileName.endsWith(QLatin1String(".dll"))
#elif defined(Q_OS_DARWIN)
|| fileName.endsWith(QLatin1String(".dylib"))
|| fileName.endsWith(QLatin1String(".so"))
|| fileName.endsWith(QLatin1String(".bundle"))
#else // Unix
|| fileName.endsWith(QLatin1String(".so"))
|| fileName.endsWith(QLatin1String(".sl"))
#endif
) {
#if defined(Q_OS_WIN32) || defined(Q_OS_WINCE) || defined(Q_OS_DARWIN)
fileName = fileName.toLower();
#endif
files->insert(fileName, true);
}
}
return files;
}
#endif
/*!
\class QQmlDataBlob
\brief The QQmlDataBlob encapsulates a data request that can be issued to a QQmlDataLoader.
\internal
QQmlDataBlob's are loaded by a QQmlDataLoader. The user creates the QQmlDataBlob
and then calls QQmlDataLoader::load() or QQmlDataLoader::loadWithStaticData() to load it.
The QQmlDataLoader invokes callbacks on the QQmlDataBlob as data becomes available.
*/
/*!
\enum QQmlDataBlob::Status
This enum describes the status of the data blob.
\list
\li Null The blob has not yet been loaded by a QQmlDataLoader
\li Loading The blob is loading network data. The QQmlDataBlob::setData() callback has not yet been
invoked or has not yet returned.
\li WaitingForDependencies The blob is waiting for dependencies to be done before continueing. This status
only occurs after the QQmlDataBlob::setData() callback has been made, and when the blob has outstanding
dependencies.
\li Complete The blob's data has been loaded and all dependencies are done.
\li Error An error has been set on this blob.
\endlist
*/
/*!
\enum QQmlDataBlob::Type
This enum describes the type of the data blob.
\list
\li QmlFile This is a QQmlTypeData
\li JavaScriptFile This is a QQmlScriptData
\li QmldirFile This is a QQmlQmldirData
\endlist
*/
/*!
Create a new QQmlDataBlob for \a url and of the provided \a type.
*/
QQmlDataBlob::QQmlDataBlob(const QUrl &url, Type type)
: m_type(type), m_url(url), m_finalUrl(url), m_manager(0), m_redirectCount(0),
m_inCallback(false), m_isDone(false)
{
}
/*! \internal */
QQmlDataBlob::~QQmlDataBlob()
{
Q_ASSERT(m_waitingOnMe.isEmpty());
cancelAllWaitingFor();
}
/*!
Returns the type provided to the constructor.
*/
QQmlDataBlob::Type QQmlDataBlob::type() const
{
return m_type;
}
/*!
Returns the blob's status.
*/
QQmlDataBlob::Status QQmlDataBlob::status() const
{
return m_data.status();
}
/*!
Returns true if the status is Null.
*/
bool QQmlDataBlob::isNull() const
{
return status() == Null;
}
/*!
Returns true if the status is Loading.
*/
bool QQmlDataBlob::isLoading() const
{
return status() == Loading;
}
/*!
Returns true if the status is WaitingForDependencies.
*/
bool QQmlDataBlob::isWaiting() const
{
return status() == WaitingForDependencies;
}
/*!
Returns true if the status is Complete.
*/
bool QQmlDataBlob::isComplete() const
{
return status() == Complete;
}
/*!
Returns true if the status is Error.
*/
bool QQmlDataBlob::isError() const
{
return status() == Error;
}
/*!
Returns true if the status is Complete or Error.
*/
bool QQmlDataBlob::isCompleteOrError() const
{
Status s = status();
return s == Error || s == Complete;
}
/*!
Returns the data download progress from 0 to 1.
*/
qreal QQmlDataBlob::progress() const
{
quint8 p = m_data.progress();
if (p == 0xFF) return 1.;
else return qreal(p) / qreal(0xFF);
}
/*!
Returns the blob url passed to the constructor. If a network redirect
happens while fetching the data, this url remains the same.
\sa finalUrl()
*/
QUrl QQmlDataBlob::url() const
{
return m_url;
}
/*!
Returns the final url of the data. Initially this is the same as
url(), but if a network redirect happens while fetching the data, this url
is updated to reflect the new location.
May only be called from the load thread, or after the blob isCompleteOrError().
*/
QUrl QQmlDataBlob::finalUrl() const
{
Q_ASSERT(isCompleteOrError() || (m_manager && m_manager->m_thread->isThisThread()));
return m_finalUrl;
}
/*!
Returns the finalUrl() as a string.
*/
QString QQmlDataBlob::finalUrlString() const
{
Q_ASSERT(isCompleteOrError() || (m_manager && m_manager->m_thread->isThisThread()));
if (m_finalUrlString.isEmpty())
m_finalUrlString = m_finalUrl.toString();
return m_finalUrlString;
}
/*!
Return the errors on this blob.
May only be called from the load thread, or after the blob isCompleteOrError().
*/
QList<QQmlError> QQmlDataBlob::errors() const
{
Q_ASSERT(isCompleteOrError() || (m_manager && m_manager->m_thread->isThisThread()));
return m_errors;
}
/*!
Mark this blob as having \a errors.
All outstanding dependencies will be cancelled. Requests to add new dependencies
will be ignored. Entry into the Error state is irreversable.
The setError() method may only be called from within a QQmlDataBlob callback.
*/
void QQmlDataBlob::setError(const QQmlError &errors)
{
ASSERT_CALLBACK();
QList<QQmlError> l;
l << errors;
setError(l);
}
/*!
\overload
*/
void QQmlDataBlob::setError(const QList<QQmlError> &errors)
{
ASSERT_CALLBACK();
Q_ASSERT(status() != Error);
Q_ASSERT(m_errors.isEmpty());
m_errors = errors; // Must be set before the m_data fence
m_data.setStatus(Error);
cancelAllWaitingFor();
if (!m_inCallback)
tryDone();
}
/*!
Wait for \a blob to become complete or to error. If \a blob is already
complete or in error, or this blob is already complete, this has no effect.
The setError() method may only be called from within a QQmlDataBlob callback.
*/
void QQmlDataBlob::addDependency(QQmlDataBlob *blob)
{
ASSERT_CALLBACK();
Q_ASSERT(status() != Null);
if (!blob ||
blob->status() == Error || blob->status() == Complete ||
status() == Error || status() == Complete || m_isDone ||
m_waitingFor.contains(blob))
return;
blob->addref();
m_data.setStatus(WaitingForDependencies);
m_waitingFor.append(blob);
blob->m_waitingOnMe.append(this);
}
/*!
\fn void QQmlDataBlob::dataReceived(const QByteArray &data)
Invoked when data for the blob is received. Implementors should use this callback
to determine a blob's dependencies. Within this callback you may call setError()
or addDependency().
*/
/*!
Invoked once data has either been received or a network error occurred, and all
dependencies are complete.
You can set an error in this method, but you cannot add new dependencies. Implementors
should use this callback to finalize processing of data.
The default implementation does nothing.
XXX Rename processData() or some such to avoid confusion between done() (processing thread)
and completed() (main thread)
*/
void QQmlDataBlob::done()
{
}
/*!
Invoked if there is a network error while fetching this blob.
The default implementation sets an appropriate QQmlError.
*/
void QQmlDataBlob::networkError(QNetworkReply::NetworkError networkError)
{
Q_UNUSED(networkError);
QQmlError error;
error.setUrl(m_finalUrl);
const char *errorString = 0;
switch (networkError) {
default:
errorString = "Network error";
break;
case QNetworkReply::ConnectionRefusedError:
errorString = "Connection refused";
break;
case QNetworkReply::RemoteHostClosedError:
errorString = "Remote host closed the connection";
break;
case QNetworkReply::HostNotFoundError:
errorString = "Host not found";
break;
case QNetworkReply::TimeoutError:
errorString = "Timeout";
break;
case QNetworkReply::ProxyConnectionRefusedError:
case QNetworkReply::ProxyConnectionClosedError:
case QNetworkReply::ProxyNotFoundError:
case QNetworkReply::ProxyTimeoutError:
case QNetworkReply::ProxyAuthenticationRequiredError:
case QNetworkReply::UnknownProxyError:
errorString = "Proxy error";
break;
case QNetworkReply::ContentAccessDenied:
errorString = "Access denied";
break;
case QNetworkReply::ContentNotFoundError:
errorString = "File not found";
break;
case QNetworkReply::AuthenticationRequiredError:
errorString = "Authentication required";
break;
};
error.setDescription(QLatin1String(errorString));
setError(error);
}
/*!
Called if \a blob, which was previously waited for, has an error.
The default implementation does nothing.
*/
void QQmlDataBlob::dependencyError(QQmlDataBlob *blob)
{
Q_UNUSED(blob);
}
/*!
Called if \a blob, which was previously waited for, has completed.
The default implementation does nothing.
*/
void QQmlDataBlob::dependencyComplete(QQmlDataBlob *blob)
{
Q_UNUSED(blob);
}
/*!
Called when all blobs waited for have completed. This occurs regardless of
whether they are in error, or complete state.
The default implementation does nothing.
*/
void QQmlDataBlob::allDependenciesDone()
{
}
/*!
Called when the download progress of this blob changes. \a progress goes
from 0 to 1.
This callback is only invoked if an asynchronous load for this blob is
made. An asynchronous load is one in which the Asynchronous mode is
specified explicitly, or one that is implicitly delayed due to a network
operation.
The default implementation does nothing.
*/
void QQmlDataBlob::downloadProgressChanged(qreal progress)
{
Q_UNUSED(progress);
}
/*!
Invoked on the main thread sometime after done() was called on the load thread.
You cannot modify the blobs state at all in this callback and cannot depend on the
order or timeliness of these callbacks. Implementors should use this callback to notify
dependencies on the main thread that the blob is done and not a lot else.
This callback is only invoked if an asynchronous load for this blob is
made. An asynchronous load is one in which the Asynchronous mode is
specified explicitly, or one that is implicitly delayed due to a network
operation.
The default implementation does nothing.
*/
void QQmlDataBlob::completed()
{
}
void QQmlDataBlob::tryDone()
{
if (status() != Loading && m_waitingFor.isEmpty() && !m_isDone) {
m_isDone = true;
addref();
#ifdef DATABLOB_DEBUG
qWarning("QQmlDataBlob::done() %s", qPrintable(url().toString()));
#endif
done();
if (status() != Error)
m_data.setStatus(Complete);
notifyAllWaitingOnMe();
// Locking is not required here, as anyone expecting callbacks must
// already be protected against the blob being completed (as set above);
if (m_data.isAsync()) {
#ifdef DATABLOB_DEBUG
qWarning("QQmlDataBlob: Dispatching completed");
#endif
m_manager->m_thread->callCompleted(this);
}
release();
}
}
void QQmlDataBlob::cancelAllWaitingFor()
{
while (m_waitingFor.count()) {
QQmlDataBlob *blob = m_waitingFor.takeLast();
Q_ASSERT(blob->m_waitingOnMe.contains(this));
blob->m_waitingOnMe.removeOne(this);
blob->release();
}
}
void QQmlDataBlob::notifyAllWaitingOnMe()
{
while (m_waitingOnMe.count()) {
QQmlDataBlob *blob = m_waitingOnMe.takeLast();
Q_ASSERT(blob->m_waitingFor.contains(this));
blob->notifyComplete(this);
}
}
void QQmlDataBlob::notifyComplete(QQmlDataBlob *blob)
{
Q_ASSERT(m_waitingFor.contains(blob));
Q_ASSERT(blob->status() == Error || blob->status() == Complete);
m_inCallback = true;
if (blob->status() == Error) {
dependencyError(blob);
} else if (blob->status() == Complete) {
dependencyComplete(blob);
}
m_waitingFor.removeOne(blob);
blob->release();
if (!isError() && m_waitingFor.isEmpty())
allDependenciesDone();
m_inCallback = false;
tryDone();
}
#define TD_STATUS_MASK 0x0000FFFF
#define TD_STATUS_SHIFT 0
#define TD_PROGRESS_MASK 0x00FF0000
#define TD_PROGRESS_SHIFT 16
#define TD_ASYNC_MASK 0x80000000
QQmlDataBlob::ThreadData::ThreadData()
: _p(0)
{
}
QQmlDataBlob::Status QQmlDataBlob::ThreadData::status() const
{
return QQmlDataBlob::Status((_p.load() & TD_STATUS_MASK) >> TD_STATUS_SHIFT);
}
void QQmlDataBlob::ThreadData::setStatus(QQmlDataBlob::Status status)
{
while (true) {
int d = _p.load();
int nd = (d & ~TD_STATUS_MASK) | ((status << TD_STATUS_SHIFT) & TD_STATUS_MASK);
if (d == nd || _p.testAndSetOrdered(d, nd)) return;
}
}
bool QQmlDataBlob::ThreadData::isAsync() const
{
return _p.load() & TD_ASYNC_MASK;
}
void QQmlDataBlob::ThreadData::setIsAsync(bool v)
{
while (true) {
int d = _p.load();
int nd = (d & ~TD_ASYNC_MASK) | (v?TD_ASYNC_MASK:0);
if (d == nd || _p.testAndSetOrdered(d, nd)) return;
}
}
quint8 QQmlDataBlob::ThreadData::progress() const
{
return quint8((_p.load() & TD_PROGRESS_MASK) >> TD_PROGRESS_SHIFT);
}
void QQmlDataBlob::ThreadData::setProgress(quint8 v)
{
while (true) {
int d = _p.load();
int nd = (d & ~TD_PROGRESS_MASK) | ((v << TD_PROGRESS_SHIFT) & TD_PROGRESS_MASK);
if (d == nd || _p.testAndSetOrdered(d, nd)) return;
}
}
QQmlDataLoaderThread::QQmlDataLoaderThread(QQmlDataLoader *loader)
: m_loader(loader), m_networkAccessManager(0), m_networkReplyProxy(0)
{
}
QNetworkAccessManager *QQmlDataLoaderThread::networkAccessManager() const
{
Q_ASSERT(isThisThread());
if (!m_networkAccessManager) {
m_networkAccessManager = QQmlEnginePrivate::get(m_loader->engine())->createNetworkAccessManager(0);
m_networkReplyProxy = new QQmlDataLoaderNetworkReplyProxy(m_loader);
}
return m_networkAccessManager;
}
QQmlDataLoaderNetworkReplyProxy *QQmlDataLoaderThread::networkReplyProxy() const
{
Q_ASSERT(isThisThread());
Q_ASSERT(m_networkReplyProxy); // Must call networkAccessManager() first
return m_networkReplyProxy;
}
void QQmlDataLoaderThread::load(QQmlDataBlob *b)
{
b->addref();
callMethodInThread(&This::loadThread, b);
}
void QQmlDataLoaderThread::loadAsync(QQmlDataBlob *b)
{
b->addref();
postMethodToThread(&This::loadThread, b);
}
void QQmlDataLoaderThread::loadWithStaticData(QQmlDataBlob *b, const QByteArray &d)
{
b->addref();
callMethodInThread(&This::loadWithStaticDataThread, b, d);
}
void QQmlDataLoaderThread::loadWithStaticDataAsync(QQmlDataBlob *b, const QByteArray &d)
{
b->addref();
postMethodToThread(&This::loadWithStaticDataThread, b, d);
}
void QQmlDataLoaderThread::callCompleted(QQmlDataBlob *b)
{
b->addref();
postMethodToMain(&This::callCompletedMain, b);
}
void QQmlDataLoaderThread::callDownloadProgressChanged(QQmlDataBlob *b, qreal p)
{
b->addref();
postMethodToMain(&This::callDownloadProgressChangedMain, b, p);
}
void QQmlDataLoaderThread::initializeEngine(QQmlExtensionInterface *iface,
const char *uri)
{
callMethodInMain(&This::initializeEngineMain, iface, uri);
}
void QQmlDataLoaderThread::shutdownThread()
{
delete m_networkAccessManager;
m_networkAccessManager = 0;
delete m_networkReplyProxy;
m_networkReplyProxy = 0;
}
void QQmlDataLoaderThread::loadThread(QQmlDataBlob *b)
{
m_loader->loadThread(b);
b->release();
}
void QQmlDataLoaderThread::loadWithStaticDataThread(QQmlDataBlob *b, const QByteArray &d)
{
m_loader->loadWithStaticDataThread(b, d);
b->release();
}
void QQmlDataLoaderThread::callCompletedMain(QQmlDataBlob *b)
{
#ifdef DATABLOB_DEBUG
qWarning("QQmlDataLoaderThread: %s completed() callback", qPrintable(b->url().toString()));
#endif
b->completed();
b->release();
}
void QQmlDataLoaderThread::callDownloadProgressChangedMain(QQmlDataBlob *b, qreal p)
{
#ifdef DATABLOB_DEBUG
qWarning("QQmlDataLoaderThread: %s downloadProgressChanged(%f) callback",
qPrintable(b->url().toString()), p);
#endif
b->downloadProgressChanged(p);
b->release();
}
void QQmlDataLoaderThread::initializeEngineMain(QQmlExtensionInterface *iface,
const char *uri)
{
Q_ASSERT(m_loader->engine()->thread() == QThread::currentThread());
iface->initializeEngine(m_loader->engine(), uri);
}
/*!
\class QQmlDataLoader
\brief The QQmlDataLoader class abstracts loading files and their dependencies over the network.
\internal
The QQmlDataLoader class is provided for the exclusive use of the QQmlTypeLoader class.
Clients create QQmlDataBlob instances and submit them to the QQmlDataLoader class
through the QQmlDataLoader::load() or QQmlDataLoader::loadWithStaticData() methods.
The loader then fetches the data over the network or from the local file system in an efficient way.
QQmlDataBlob is an abstract class, so should always be specialized.
Once data is received, the QQmlDataBlob::dataReceived() method is invoked on the blob. The
derived class should use this callback to process the received data. Processing of the data can
result in an error being set (QQmlDataBlob::setError()), or one or more dependencies being
created (QQmlDataBlob::addDependency()). Dependencies are other QQmlDataBlob's that
are required before processing can fully complete.
To complete processing, the QQmlDataBlob::done() callback is invoked. done() is called when
one of these three preconditions are met.
\list 1
\li The QQmlDataBlob has no dependencies.
\li The QQmlDataBlob has an error set.
\li All the QQmlDataBlob's dependencies are themselves "done()".
\endlist
Thus QQmlDataBlob::done() will always eventually be called, even if the blob has an error set.
*/
/*!
Create a new QQmlDataLoader for \a engine.
*/
QQmlDataLoader::QQmlDataLoader(QQmlEngine *engine)
: m_engine(engine), m_thread(new QQmlDataLoaderThread(this))
{
}
/*! \internal */
QQmlDataLoader::~QQmlDataLoader()
{
for (NetworkReplies::Iterator iter = m_networkReplies.begin(); iter != m_networkReplies.end(); ++iter)
(*iter)->release();
m_thread->shutdown();
delete m_thread;
}
void QQmlDataLoader::lock()
{
m_thread->lock();
}
void QQmlDataLoader::unlock()
{
m_thread->unlock();
}
/*!
Load the provided \a blob from the network or filesystem.
The loader must be locked.
*/
void QQmlDataLoader::load(QQmlDataBlob *blob, Mode mode)
{
#ifdef DATABLOB_DEBUG
qWarning("QQmlDataLoader::load(%s): %s thread", qPrintable(blob->m_url.toString()),
m_thread->isThisThread()?"Compile":"Engine");
#endif
Q_ASSERT(blob->status() == QQmlDataBlob::Null);
Q_ASSERT(blob->m_manager == 0);
blob->m_data.setStatus(QQmlDataBlob::Loading);
blob->m_manager = this;
if (m_thread->isThisThread()) {
unlock();
loadThread(blob);
lock();
} else if (mode == PreferSynchronous) {
unlock();
m_thread->load(blob);
lock();
if (!blob->isCompleteOrError())
blob->m_data.setIsAsync(true);
} else {
Q_ASSERT(mode == Asynchronous);
blob->m_data.setIsAsync(true);
unlock();
m_thread->loadAsync(blob);
lock();
}
}
/*!
Load the provided \a blob with \a data. The blob's URL is not used by the data loader in this case.
The loader must be locked.
*/
void QQmlDataLoader::loadWithStaticData(QQmlDataBlob *blob, const QByteArray &data, Mode mode)
{
#ifdef DATABLOB_DEBUG
qWarning("QQmlDataLoader::loadWithStaticData(%s, data): %s thread", qPrintable(blob->m_url.toString()),
m_thread->isThisThread()?"Compile":"Engine");
#endif
Q_ASSERT(blob->status() == QQmlDataBlob::Null);
Q_ASSERT(blob->m_manager == 0);
blob->m_data.setStatus(QQmlDataBlob::Loading);
blob->m_manager = this;
if (m_thread->isThisThread()) {
unlock();
loadWithStaticDataThread(blob, data);
lock();
} else if (mode == PreferSynchronous) {
unlock();
m_thread->loadWithStaticData(blob, data);
lock();
if (!blob->isCompleteOrError())
blob->m_data.setIsAsync(true);
} else {
Q_ASSERT(mode == Asynchronous);
blob->m_data.setIsAsync(true);
unlock();
m_thread->loadWithStaticDataAsync(blob, data);
lock();
}