plasma-framework/plasma/private/dataenginemanager.cpp
2013-01-30 13:43:33 +01:00

214 lines
5.9 KiB
C++

/*
* Copyright 2006-2007 Aaron Seigo <aseigo@kde.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Library General Public License as
* published by the Free Software Foundation; either version 2, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details
*
* You should have received a copy of the GNU Library General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include "dataenginemanager_p.h"
#include <QFile>
#include <QTextStream>
#include <kdebug.h>
#include <klocale.h>
#include <kservicetypetrader.h>
#include <qstandardpaths.h>
#include "datacontainer.h"
#include "pluginloader.h"
#include "private/componentinstaller_p.h"
#include "private/dataengine_p.h"
#include "private/datacontainer_p.h"
#include "scripting/scriptengine.h"
namespace Plasma
{
class NullEngine : public DataEngine
{
public:
NullEngine(QObject *parent = 0)
: DataEngine(parent)
{
setValid(false);
// ref() ourselves to ensure we never get deleted
d->ref();
}
};
class DataEngineManagerPrivate
{
public:
DataEngineManagerPrivate()
: nullEng(0)
{}
~DataEngineManagerPrivate()
{
foreach (Plasma::DataEngine *engine, engines) {
delete engine;
}
engines.clear();
delete nullEng;
}
DataEngine *nullEngine()
{
if (!nullEng) {
nullEng = new NullEngine;
}
return nullEng;
}
DataEngine::Dict engines;
DataEngine *nullEng;
};
class DataEngineManagerSingleton
{
public:
DataEngineManager self;
};
Q_GLOBAL_STATIC(DataEngineManagerSingleton, privateDataEngineManagerSelf)
DataEngineManager *DataEngineManager::self()
{
return &privateDataEngineManagerSelf()->self;
}
DataEngineManager::DataEngineManager()
: d(new DataEngineManagerPrivate)
{
//startTimer(30000);
}
DataEngineManager::~DataEngineManager()
{
delete d;
}
Plasma::DataEngine *DataEngineManager::engine(const QString &name) const
{
if (name.isEmpty()) {
return d->nullEngine();
}
Plasma::DataEngine::Dict::const_iterator it = d->engines.constFind(name);
if (it != d->engines.constEnd()) {
// ref and return the engine
//Plasma::DataEngine *engine = *it;
return *it;
}
return d->nullEngine();
}
Plasma::DataEngine *DataEngineManager::loadEngine(const QString &name)
{
Plasma::DataEngine::Dict::const_iterator it = d->engines.constFind(name);
if (it != d->engines.constEnd()) {
DataEngine *engine = *it;
engine->d->ref();
return engine;
}
DataEngine *engine = PluginLoader::self()->loadDataEngine(name);
if (!engine) {
// Try installing the engine. However, it's too late for this request.
ComponentInstaller::self()->installMissingComponent("dataengine", name);
return d->nullEngine();
}
engine->init();
d->engines[name] = engine;
return engine;
}
void DataEngineManager::unloadEngine(const QString &name)
{
Plasma::DataEngine::Dict::iterator it = d->engines.find(name);
if (it != d->engines.end()) {
Plasma::DataEngine *engine = *it;
engine->d->deref();
if (!engine->d->isUsed()) {
d->engines.erase(it);
delete engine;
}
}
}
void DataEngineManager::timerEvent(QTimerEvent *)
{
#ifndef NDEBUG
QString path = QStandardPaths::writableLocation(QStandardPaths::DataLocation) + QLatin1Char('/') + "plasma_dataenginemanager_log";
QFile f(path);
if (!f.open(QIODevice::WriteOnly | QIODevice::Append | QIODevice::Text)) {
kDebug() << "faild to open" << path;
return;
}
QTextStream out(&f);
QHashIterator<QString, DataEngine*> it(d->engines);
out << "================================== " << KLocale::global()->formatDateTime(QDateTime::currentDateTime()) << endl;
while (it.hasNext()) {
it.next();
DataEngine *engine = it.value();
out << "DataEngine: " << it.key() << ' ' << engine << endl;
out << " Claimed # of sources: " << engine->sources().count() << endl;
out << " Actual # of sources: " << engine->containerDict().count() << endl;
out << endl << " Source Details" << endl;
foreach (DataContainer *dc, engine->containerDict()) {
out << " * " << dc->objectName() << endl;
out << " Data count: " << dc->d->data.count() << endl;
out << " Stored: " << dc->isStorageEnabled() << ' ' << endl;
const int directs = dc->receivers(SIGNAL(dataUpdated(QString,Plasma::DataEngine::Data)));
if (directs > 0) {
out << " Direction Connections: " << directs << ' ' << endl;
}
const int relays = dc->d->relays.count();
if (relays > 0) {
out << " Relays: " << dc->d->relays.count() << endl;
QString times;
foreach (SignalRelay *relay, dc->d->relays) {
times.append(' ').append(QString::number(relay->m_interval));
}
out << " Relay Timeouts: " << times << ' ' << endl;
}
}
out << endl << "-----" << endl;
}
out << endl << endl;
#endif
// killTimer(event->timerId());
}
} // namespace Plasma
#include "moc_dataenginemanager_p.cpp"