771 lines
20 KiB
C++
771 lines
20 KiB
C++
/*
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* Copyright 2006-2007 Aaron Seigo <aseigo@kde.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Library General Public License as
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* published by the Free Software Foundation; either version 2, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include "dataengine.h"
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#include "private/dataengine_p.h"
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#include "private/datacontainer_p.h"
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#include <QQueue>
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#include <QTimer>
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#include <QTime>
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#include <QTimerEvent>
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#include <QVariant>
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#include <kdebug.h>
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#include <kplugininfo.h>
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#include <kservice.h>
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#include <kstandarddirs.h>
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#include "datacontainer.h"
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#include "package.h"
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#include "pluginloader.h"
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#include "remote/authorizationmanager.h"
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#include "remote/authorizationmanager_p.h"
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#include "service.h"
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#include "scripting/dataenginescript.h"
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#include "private/datacontainer_p.h"
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#include "private/dataengineservice_p.h"
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#include "private/remotedataengine_p.h"
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#include "private/service_p.h"
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#include "private/storage_p.h"
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namespace Plasma
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{
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DataEngine::DataEngine(QObject *parent, KService::Ptr service)
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: QObject(parent),
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d(new DataEnginePrivate(this, KPluginInfo(service)))
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{
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}
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DataEngine::DataEngine(QObject *parent, const QVariantList &args)
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: QObject(parent),
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d(new DataEnginePrivate(this, KPluginInfo(KService::serviceByStorageId(args.count() > 0 ? args[0].toString() : QString()))))
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{
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}
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DataEngine::~DataEngine()
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{
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//kDebug() << objectName() << ": bye bye birdy! ";
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delete d;
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}
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QStringList DataEngine::sources() const
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{
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if (d->script) {
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return d->script->sources();
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} else {
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return d->sources.keys();
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}
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}
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Service *DataEngine::serviceForSource(const QString &source)
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{
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if (d->script) {
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Service * s = d->script->serviceForSource(source);
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if (s) {
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return s;
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}
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}
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return new NullService(source, this);
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}
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void DataEngine::connectSource(const QString &source, QObject *visualization,
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uint pollingInterval,
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Plasma::IntervalAlignment intervalAlignment) const
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{
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//kDebug() << "connectSource" << source;
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bool newSource;
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DataContainer *s = d->requestSource(source, &newSource);
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if (s) {
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// we suppress the immediate invocation of dataUpdated here if the
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// source was prexisting and they don't request delayed updates
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// (we want to do an immediate update in that case so they don't
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// have to wait for the first time out)
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if (newSource && !s->data().isEmpty()) {
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newSource = false;
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}
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d->connectSource(s, visualization, pollingInterval, intervalAlignment,
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!newSource || pollingInterval > 0);
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//kDebug() << " ==> source connected";
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}
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}
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void DataEngine::connectAllSources(QObject *visualization, uint pollingInterval,
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Plasma::IntervalAlignment intervalAlignment) const
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{
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foreach (DataContainer *s, d->sources) {
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d->connectSource(s, visualization, pollingInterval, intervalAlignment);
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}
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}
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void DataEngine::disconnectSource(const QString &source, QObject *visualization) const
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{
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DataContainer *s = d->source(source, false);
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if (s) {
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s->disconnectVisualization(visualization);
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}
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}
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DataContainer *DataEngine::containerForSource(const QString &source)
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{
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return d->source(source, false);
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}
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DataEngine::Data DataEngine::query(const QString &source) const
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{
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bool newSource;
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DataContainer *s = d->requestSource(source, &newSource);
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if (!s) {
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return DataEngine::Data();
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} else if (!newSource && d->minPollingInterval >= 0 &&
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s->timeSinceLastUpdate() >= uint(d->minPollingInterval)) {
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DataEngine *unconstThis = const_cast<DataEngine*>(this);
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if (unconstThis->updateSourceEvent(source)) {
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unconstThis->scheduleSourcesUpdated();
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}
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}
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DataEngine::Data data = s->data();
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s->d->checkUsage();
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return data;
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}
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void DataEngine::init()
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{
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if (d->script) {
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d->setupScriptSupport();
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d->script->init();
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} else {
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// kDebug() << "called";
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// default implementation does nothing. this is for engines that have to
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// start things in motion external to themselves before they can work
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}
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}
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bool DataEngine::sourceRequestEvent(const QString &name)
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{
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if (d->script) {
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return d->script->sourceRequestEvent(name);
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} else {
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return false;
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}
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}
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bool DataEngine::updateSourceEvent(const QString &source)
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{
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if (d->script) {
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return d->script->updateSourceEvent(source);
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} else {
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//kDebug() << source;
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return false; //TODO: should this be true to trigger, even needless, updates on every tick?
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}
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}
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void DataEngine::setData(const QString &source, const QVariant &value)
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{
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setData(source, source, value);
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}
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void DataEngine::setData(const QString &source, const QString &key, const QVariant &value)
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{
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DataContainer *s = d->source(source, false);
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bool isNew = !s;
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if (isNew) {
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s = d->source(source);
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}
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s->setData(key, value);
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if (isNew && source != d->waitingSourceRequest) {
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emit sourceAdded(source);
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}
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scheduleSourcesUpdated();
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}
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void DataEngine::setData(const QString &source, const Data &data)
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{
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DataContainer *s = d->source(source, false);
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bool isNew = !s;
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if (isNew) {
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s = d->source(source);
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}
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Data::const_iterator it = data.constBegin();
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while (it != data.constEnd()) {
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s->setData(it.key(), it.value());
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++it;
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}
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if (isNew && source != d->waitingSourceRequest) {
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emit sourceAdded(source);
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}
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scheduleSourcesUpdated();
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}
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void DataEngine::removeAllData(const QString &source)
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{
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DataContainer *s = d->source(source, false);
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if (s) {
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s->removeAllData();
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scheduleSourcesUpdated();
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}
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}
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void DataEngine::removeData(const QString &source, const QString &key)
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{
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DataContainer *s = d->source(source, false);
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if (s) {
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s->setData(key, QVariant());
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scheduleSourcesUpdated();
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}
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}
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void DataEngine::addSource(DataContainer *source)
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{
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if (d->sources.contains(source->objectName())) {
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#ifndef NDEBUG
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kDebug() << "source named \"" << source->objectName() << "\" already exists.";
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#endif
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return;
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}
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QObject::connect(source, SIGNAL(updateRequested(DataContainer*)),
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this, SLOT(internalUpdateSource(DataContainer*)));
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QObject::connect(source, SIGNAL(destroyed(QObject*)), this, SLOT(sourceDestroyed(QObject*)));
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d->sources.insert(source->objectName(), source);
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emit sourceAdded(source->objectName());
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scheduleSourcesUpdated();
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}
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void DataEngine::setMaxSourceCount(uint limit)
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{
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if (d->limit == limit) {
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return;
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}
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d->limit = limit;
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if (d->limit > 0) {
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d->trimQueue();
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} else {
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d->sourceQueue.clear();
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}
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}
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uint DataEngine::maxSourceCount() const
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{
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return d->limit;
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}
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void DataEngine::setMinimumPollingInterval(int minimumMs)
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{
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d->minPollingInterval = minimumMs;
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}
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int DataEngine::minimumPollingInterval() const
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{
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return d->minPollingInterval;
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}
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void DataEngine::setPollingInterval(uint frequency)
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{
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killTimer(d->updateTimerId);
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d->updateTimerId = 0;
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if (frequency > 0) {
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d->updateTimerId = startTimer(frequency);
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}
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}
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void DataEngine::removeSource(const QString &source)
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{
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SourceDict::iterator it = d->sources.find(source);
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if (it != d->sources.end()) {
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DataContainer *s = it.value();
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// remove it from the limit queue if we're keeping one
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if (d->limit > 0) {
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QQueue<DataContainer*>::iterator it = d->sourceQueue.begin();
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while (it != d->sourceQueue.end()) {
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if (*it == s) {
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d->sourceQueue.erase(it);
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break;
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}
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++it;
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}
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}
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s->d->store();
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s->disconnect(this);
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s->deleteLater();
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d->sources.erase(it);
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emit sourceRemoved(source);
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}
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}
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void DataEngine::removeAllSources()
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{
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QMutableHashIterator<QString, Plasma::DataContainer*> it(d->sources);
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while (it.hasNext()) {
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it.next();
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const QString source = it.key();
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Plasma::DataContainer *s = it.value();
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it.remove();
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emit sourceRemoved(source);
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delete s;
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}
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}
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bool DataEngine::isValid() const
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{
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return d->valid;
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}
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bool DataEngine::isEmpty() const
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{
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return d->sources.isEmpty();
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}
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void DataEngine::setValid(bool valid)
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{
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d->valid = valid;
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}
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DataEngine::SourceDict DataEngine::containerDict() const
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{
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return d->sources;
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}
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void DataEngine::timerEvent(QTimerEvent *event)
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{
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//kDebug();
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if (event->timerId() == d->updateTimerId) {
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// if the freq update is less than 0, don't bother
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if (d->minPollingInterval < 0) {
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//kDebug() << "uh oh.. no polling allowed!";
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return;
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}
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// minPollingInterval
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if (d->updateTimestamp.elapsed() < d->minPollingInterval) {
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//kDebug() << "hey now.. slow down!";
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return;
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}
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d->updateTimestamp.restart();
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updateAllSources();
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} else if (event->timerId() == d->checkSourcesTimerId) {
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killTimer(d->checkSourcesTimerId);
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d->checkSourcesTimerId = 0;
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QHashIterator<QString, Plasma::DataContainer*> it(d->sources);
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while (it.hasNext()) {
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it.next();
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it.value()->checkForUpdate();
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}
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} else {
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QObject::timerEvent(event);
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}
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}
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void DataEngine::updateAllSources()
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{
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QHashIterator<QString, Plasma::DataContainer*> it(d->sources);
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while (it.hasNext()) {
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it.next();
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//kDebug() << "updating" << it.key();
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updateSourceEvent(it.key());
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}
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scheduleSourcesUpdated();
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}
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void DataEngine::forceImmediateUpdateOfAllVisualizations()
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{
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foreach (DataContainer *source, d->sources) {
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source->forceImmediateUpdate();
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}
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}
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void DataEngine::setIcon(const QString &icon)
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{
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d->icon = icon;
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}
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QString DataEngine::icon() const
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{
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return d->icon;
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}
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QString DataEngine::pluginName() const
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{
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if (!d->dataEngineDescription.isValid()) {
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return QString();
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}
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return d->dataEngineDescription.pluginName();
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}
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void DataEngine::setDefaultService(const QString &serviceName)
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{
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d->serviceName = serviceName;
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}
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Service* DataEngine::createDefaultService(QObject *parent)
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{
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QVariantList args;
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args << QVariant::fromValue<DataEngine*>(this);
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return PluginLoader::self()->loadService(d->serviceName, args, parent);
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}
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void DataEnginePrivate::publish(AnnouncementMethods methods, const QString &name)
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{
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if (!publishedService) {
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publishedService = new DataEngineService(q);
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}
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//QString resourceName =
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//i18nc("%1 is the name of a dataengine, %2 the name of the machine that engine is published
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//on",
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//"%1 dataengine on %2", name(), AuthorizationManager::self()->d->myCredentials.name());
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#ifndef NDEBUG
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kDebug() << "name: " << name;
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#endif
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publishedService->d->publish(methods, name);
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}
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void DataEnginePrivate::unpublish(const QString &name)
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{
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Q_UNUSED(name)
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if (publishedService) {
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publishedService->d->unpublish();
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}
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}
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bool DataEnginePrivate::isPublished() const
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{
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if (publishedService) {
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return publishedService->d->isPublished();
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} else {
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return false;
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}
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}
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Package DataEngine::package() const
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{
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return d->package ? *d->package : Package();
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}
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void DataEngine::scheduleSourcesUpdated()
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{
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if (d->checkSourcesTimerId) {
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return;
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}
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d->checkSourcesTimerId = startTimer(0);
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}
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QString DataEngine::name() const
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{
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return d->engineName;
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}
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void DataEngine::setName(const QString &name)
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{
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d->engineName = name;
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setObjectName(name);
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}
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void DataEngine::setStorageEnabled(const QString &source, bool store)
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{
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DataContainer *s = d->source(source, false);
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if (s) {
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s->setStorageEnabled(store);
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}
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}
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// Private class implementations
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DataEnginePrivate::DataEnginePrivate(DataEngine *e, const KPluginInfo &info)
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: q(e),
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dataEngineDescription(info),
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refCount(-1), // first ref
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checkSourcesTimerId(0),
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updateTimerId(0),
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minPollingInterval(-1),
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limit(0),
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valid(true),
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script(0),
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package(0),
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publishedService(0)
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{
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updateTimestamp.start();
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if (!info.isValid()) {
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engineName = i18n("Unnamed");
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return;
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}
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engineName = info.name();
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if (engineName.isEmpty()) {
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engineName = i18n("Unnamed");
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}
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e->setObjectName(engineName);
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icon = info.icon();
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if (dataEngineDescription.isValid()) {
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QString api = dataEngineDescription.property("X-Plasma-API").toString();
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if (!api.isEmpty()) {
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const QString path =
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KStandardDirs::locate("data",
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"plasma/dataengines/" + dataEngineDescription.pluginName() + '/');
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package = new Package(PluginLoader::self()->loadPackage("Plasma/DataEngine", api));
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package->setPath(path);
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if (package->isValid()) {
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script = Plasma::loadScriptEngine(api, q);
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}
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if (!script) {
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#ifndef NDEBUG
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kDebug() << "Could not create a" << api << "ScriptEngine for the"
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<< dataEngineDescription.name() << "DataEngine.";
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#endif
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delete package;
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package = 0;
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}
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}
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}
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}
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DataEnginePrivate::~DataEnginePrivate()
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{
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delete script;
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script = 0;
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delete package;
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package = 0;
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}
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void DataEnginePrivate::internalUpdateSource(DataContainer *source)
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{
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if (minPollingInterval > 0 &&
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source->timeSinceLastUpdate() < (uint)minPollingInterval) {
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// skip updating this source; it's been too soon
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//kDebug() << "internal update source is delaying" << source->timeSinceLastUpdate() << minPollingInterval;
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//but fake an update so that the signalrelay that triggered this gets the data from the
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//recent update. this way we don't have to worry about queuing - the relay will send a
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//signal immediately and everyone else is undisturbed.
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source->setNeedsUpdate();
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return;
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}
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if (q->updateSourceEvent(source->objectName())) {
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//kDebug() << "queuing an update";
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q->scheduleSourcesUpdated();
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}/* else {
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#ifndef NDEBUG
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kDebug() << "no update";
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#endif
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}*/
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}
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void DataEnginePrivate::ref()
|
|
{
|
|
--refCount;
|
|
}
|
|
|
|
void DataEnginePrivate::deref()
|
|
{
|
|
++refCount;
|
|
}
|
|
|
|
bool DataEnginePrivate::isUsed() const
|
|
{
|
|
return refCount != 0;
|
|
}
|
|
|
|
DataContainer *DataEnginePrivate::source(const QString &sourceName, bool createWhenMissing)
|
|
{
|
|
DataEngine::SourceDict::const_iterator it = sources.constFind(sourceName);
|
|
if (it != sources.constEnd()) {
|
|
DataContainer *s = it.value();
|
|
if (limit > 0) {
|
|
QQueue<DataContainer*>::iterator it = sourceQueue.begin();
|
|
while (it != sourceQueue.end()) {
|
|
if (*it == s) {
|
|
sourceQueue.erase(it);
|
|
break;
|
|
}
|
|
++it;
|
|
}
|
|
sourceQueue.enqueue(s);
|
|
}
|
|
return s;
|
|
}
|
|
|
|
if (!createWhenMissing) {
|
|
return 0;
|
|
}
|
|
|
|
//kDebug() << "DataEngine " << q->objectName() << ": could not find DataContainer " << sourceName << ", creating";
|
|
DataContainer *s = new DataContainer(q);
|
|
s->setObjectName(sourceName);
|
|
sources.insert(sourceName, s);
|
|
QObject::connect(s, SIGNAL(destroyed(QObject *)), q, SLOT(sourceDestroyed(QObject *)));
|
|
QObject::connect(s, SIGNAL(updateRequested(DataContainer*)),
|
|
q, SLOT(internalUpdateSource(DataContainer*)));
|
|
|
|
if (limit > 0) {
|
|
trimQueue();
|
|
sourceQueue.enqueue(s);
|
|
}
|
|
return s;
|
|
}
|
|
|
|
void DataEnginePrivate::connectSource(DataContainer *s, QObject *visualization,
|
|
uint pollingInterval,
|
|
Plasma::IntervalAlignment align,
|
|
bool immediateCall)
|
|
{
|
|
//kDebug() << "connect source called" << s->objectName() << "with interval" << pollingInterval;
|
|
|
|
//FIXME: at the moment a remote dataengine can only poll, a push mechanism will be needed instead
|
|
if (pollingInterval == 0 && qobject_cast<RemoteDataEngine *>(q)) {
|
|
pollingInterval = 5000;
|
|
}
|
|
if (pollingInterval > 0) {
|
|
// never more frequently than allowed, never more than 20 times per second
|
|
uint min = qMax(50, minPollingInterval); // for qMax below
|
|
pollingInterval = qMax(min, pollingInterval);
|
|
|
|
// align on the 50ms
|
|
pollingInterval = pollingInterval - (pollingInterval % 50);
|
|
}
|
|
|
|
if (immediateCall) {
|
|
// we don't want to do an immediate call if we are simply
|
|
// reconnecting
|
|
//kDebug() << "immediate call requested, we have:" << s->visualizationIsConnected(visualization);
|
|
immediateCall = !s->data().isEmpty() &&
|
|
!s->visualizationIsConnected(visualization);
|
|
}
|
|
|
|
s->connectVisualization(visualization, pollingInterval, align);
|
|
|
|
if (immediateCall) {
|
|
QMetaObject::invokeMethod(visualization, "dataUpdated",
|
|
Q_ARG(QString, s->objectName()),
|
|
Q_ARG(Plasma::DataEngine::Data, s->data()));
|
|
s->d->dirty = false;
|
|
}
|
|
}
|
|
|
|
void DataEnginePrivate::sourceDestroyed(QObject *object)
|
|
{
|
|
DataEngine::SourceDict::iterator it = sources.begin();
|
|
while (it != sources.end()) {
|
|
if (it.value() == object) {
|
|
sources.erase(it);
|
|
break;
|
|
}
|
|
++it;
|
|
}
|
|
}
|
|
|
|
DataContainer *DataEnginePrivate::requestSource(const QString &sourceName, bool *newSource)
|
|
{
|
|
if (newSource) {
|
|
*newSource = false;
|
|
}
|
|
|
|
//kDebug() << "requesting source " << sourceName;
|
|
DataContainer *s = source(sourceName, false);
|
|
|
|
if (!s) {
|
|
// we didn't find a data source, so give the engine an opportunity to make one
|
|
/*kDebug() << "DataEngine " << q->objectName()
|
|
<< ": could not find DataContainer " << sourceName
|
|
<< " will create on request" << endl;*/
|
|
waitingSourceRequest = sourceName;
|
|
if (q->sourceRequestEvent(sourceName)) {
|
|
s = source(sourceName, false);
|
|
if (s) {
|
|
// now we have a source; since it was created on demand, assume
|
|
// it should be removed when not used
|
|
if (newSource) {
|
|
*newSource = true;
|
|
}
|
|
QObject::connect(s, SIGNAL(becameUnused(QString)), q, SLOT(removeSource(QString)));
|
|
emit q->sourceAdded(sourceName);
|
|
}
|
|
}
|
|
waitingSourceRequest.clear();
|
|
}
|
|
|
|
return s;
|
|
}
|
|
|
|
void DataEnginePrivate::trimQueue()
|
|
{
|
|
uint queueCount = sourceQueue.count();
|
|
while (queueCount >= limit && !sourceQueue.isEmpty()) {
|
|
DataContainer *punted = sourceQueue.dequeue();
|
|
q->removeSource(punted->objectName());
|
|
queueCount = sourceQueue.count();
|
|
}
|
|
}
|
|
|
|
// put all setup routines for script here. at this point we can assume that
|
|
// package exists and that we have a script engine
|
|
void DataEnginePrivate::setupScriptSupport()
|
|
{
|
|
if (!package) {
|
|
return;
|
|
}
|
|
|
|
/*
|
|
#ifndef NDEBUG
|
|
kDebug() << "sletting up script support, package is in" << package->path()
|
|
#endif
|
|
<< "which is a" << package->structure()->type() << "package"
|
|
<< ", main script is" << package->filePath("mainscript");
|
|
*/
|
|
|
|
const QString translationsPath = package->filePath("translations");
|
|
if (!translationsPath.isEmpty()) {
|
|
KGlobal::dirs()->addResourceDir("locale", translationsPath);
|
|
KGlobal::locale()->insertCatalog(dataEngineDescription.pluginName());
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
#include "dataengine.moc"
|