361 lines
10 KiB
C++
361 lines
10 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 "datacontainer.h"
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#include "private/datacontainer_p.h"
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#include "private/storage_p.h"
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#include <kdebug.h>
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#include "plasma.h"
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namespace Plasma
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{
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DataContainer::DataContainer(QObject *parent)
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: QObject(parent),
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d(new DataContainerPrivate(this))
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{
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}
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DataContainer::~DataContainer()
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{
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delete d;
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}
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const DataEngine::Data DataContainer::data() const
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{
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return d->data;
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}
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void DataContainer::setData(const QString &key, const QVariant &value)
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{
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if (!value.isValid()) {
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d->data.remove(key);
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} else {
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d->data.insert(key, value);
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}
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d->dirty = true;
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d->updateTs.start();
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//check if storage is enabled and if storage is needed.
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//If it is not set to be stored,then this is the first
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//setData() since the last time it was stored. This
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//gives us only one singleShot timer.
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if (isStorageEnabled() || !needsToBeStored()) {
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d->storageTimer.start(180000, this);
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}
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setNeedsToBeStored(true);
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}
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void DataContainer::removeAllData()
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{
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if (d->data.isEmpty()) {
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// avoid an update if we don't have any data anyways
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return;
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}
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d->data.clear();
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d->dirty = true;
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d->updateTs.start();
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}
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bool DataContainer::visualizationIsConnected(QObject *visualization) const
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{
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return d->relayObjects.contains(visualization);
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}
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void DataContainer::connectVisualization(QObject *visualization, uint pollingInterval,
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Plasma::IntervalAlignment alignment)
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{
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//kDebug() << "connecting visualization" << visualization << "at interval of"
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// << pollingInterval << "to" << objectName();
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QMap<QObject *, SignalRelay *>::iterator objIt = d->relayObjects.find(visualization);
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bool connected = objIt != d->relayObjects.end();
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if (connected) {
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// this visualization is already connected. just adjust the update
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// frequency if necessary
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SignalRelay *relay = objIt.value();
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if (relay) {
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// connected to a relay
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//kDebug() << " already connected, but to a relay";
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if (relay->m_interval == pollingInterval) {
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//kDebug() << " already connected to a relay of the same interval of"
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// << pollingInterval << ", nothing to do";
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return;
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}
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if (relay->receiverCount() == 1) {
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//kDebug() << " removing relay, as it is now unused";
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d->relays.remove(relay->m_interval);
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delete relay;
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} else {
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disconnect(relay, SIGNAL(dataUpdated(QString,Plasma::DataEngine::Data)),
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visualization, SLOT(dataUpdated(QString,Plasma::DataEngine::Data)));
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//relay->isUnused();
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}
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} else if (pollingInterval < 1) {
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// the visualization was connected already, but not to a relay
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// and it still doesn't want to connect to a relay, so we have
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// nothing to do!
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//kDebug() << " already connected, nothing to do";
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return;
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} else {
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disconnect(this, SIGNAL(dataUpdated(QString,Plasma::DataEngine::Data)),
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visualization, SLOT(dataUpdated(QString,Plasma::DataEngine::Data)));
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}
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} else {
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connect(visualization, SIGNAL(destroyed(QObject*)),
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this, SLOT(disconnectVisualization(QObject*)));//, Qt::QueuedConnection);
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}
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if (pollingInterval < 1) {
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//kDebug() << " connecting directly";
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d->relayObjects[visualization] = 0;
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connect(this, SIGNAL(dataUpdated(QString,Plasma::DataEngine::Data)),
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visualization, SLOT(dataUpdated(QString,Plasma::DataEngine::Data)));
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} else {
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//kDebug() << " connecting to a relay";
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// we only want to do an imediate update if this is not the first object to connect to us
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// if it is the first visualization, then the source will already have been populated
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// engine's sourceRequested method
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bool immediateUpdate = connected || d->relayObjects.count() > 1;
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SignalRelay *relay = d->signalRelay(this, visualization, pollingInterval,
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alignment, immediateUpdate);
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connect(relay, SIGNAL(dataUpdated(QString,Plasma::DataEngine::Data)),
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visualization, SLOT(dataUpdated(QString,Plasma::DataEngine::Data)));
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}
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}
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void DataContainer::setStorageEnabled(bool store)
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{
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QTime time = QTime::currentTime();
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qsrand((uint)time.msec());
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d->enableStorage = store;
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if (store) {
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QTimer::singleShot(qrand() % (2000 + 1) , this, SLOT(retrieve()));
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}
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}
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bool DataContainer::isStorageEnabled() const
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{
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return d->enableStorage;
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}
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bool DataContainer::needsToBeStored() const
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{
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return !d->isStored;
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}
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void DataContainer::setNeedsToBeStored(bool store)
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{
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d->isStored = !store;
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}
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DataEngine* DataContainer::getDataEngine()
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{
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QObject *o = this;
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DataEngine *de = NULL;
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while (de == NULL)
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{
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o = dynamic_cast<QObject *> (o->parent());
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if (o == NULL) {
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return NULL;
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}
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de = dynamic_cast<DataEngine *> (o);
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}
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return de;
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}
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void DataContainerPrivate::store()
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{
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if (!q->needsToBeStored() || !q->isStorageEnabled()) {
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return;
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}
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DataEngine* de = q->getDataEngine();
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if (!de) {
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return;
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}
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q->setNeedsToBeStored(false);
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if (!storage) {
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storage = new Storage(q);
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}
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KConfigGroup op = storage->operationDescription("save");
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op.writeEntry("group", q->objectName());
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StorageJob *job = static_cast<StorageJob *>(storage->startOperationCall(op));
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job->setData(data);
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storageCount++;
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QObject::connect(job, SIGNAL(finished(KJob*)), q, SLOT(storeJobFinished(KJob*)));
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}
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void DataContainerPrivate::storeJobFinished(KJob* )
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{
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--storageCount;
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if (storageCount < 1) {
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storage->deleteLater();
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storage = 0;
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}
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}
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void DataContainerPrivate::retrieve()
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{
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DataEngine* de = q->getDataEngine();
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if (de == NULL) {
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return;
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}
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if (!storage) {
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storage = new Storage(q);
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}
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KConfigGroup retrieveGroup = storage->operationDescription("retrieve");
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retrieveGroup.writeEntry("group", q->objectName());
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ServiceJob* retrieveJob = storage->startOperationCall(retrieveGroup);
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QObject::connect(retrieveJob, SIGNAL(result(KJob*)), q,
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SLOT(populateFromStoredData(KJob*)));
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}
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void DataContainerPrivate::populateFromStoredData(KJob *job)
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{
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if (job->error()) {
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return;
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}
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StorageJob *ret = dynamic_cast<StorageJob*>(job);
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if (!ret) {
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return;
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}
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// Only fill the source with old stored
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// data if it is not already populated with new data.
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if (data.isEmpty() && !ret->data().isEmpty()) {
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data = ret->data();
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dirty = true;
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q->forceImmediateUpdate();
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}
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KConfigGroup expireGroup = storage->operationDescription("expire");
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//expire things older than 4 days
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expireGroup.writeEntry("age", 345600);
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storage->startOperationCall(expireGroup);
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}
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void DataContainer::disconnectVisualization(QObject *visualization)
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{
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QMap<QObject *, SignalRelay *>::iterator objIt = d->relayObjects.find(visualization);
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disconnect(visualization, SIGNAL(destroyed(QObject*)),
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this, SLOT(disconnectVisualization(QObject*)));//, Qt::QueuedConnection);
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if (objIt == d->relayObjects.end() || !objIt.value()) {
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// it is connected directly to the DataContainer itself
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disconnect(this, SIGNAL(dataUpdated(QString,Plasma::DataEngine::Data)),
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visualization, SLOT(dataUpdated(QString,Plasma::DataEngine::Data)));
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} else {
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SignalRelay *relay = objIt.value();
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if (relay->receiverCount() == 1) {
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d->relays.remove(relay->m_interval);
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delete relay;
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} else {
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disconnect(relay, SIGNAL(dataUpdated(QString,Plasma::DataEngine::Data)),
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visualization, SLOT(dataUpdated(QString,Plasma::DataEngine::Data)));
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}
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}
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d->relayObjects.erase(objIt);
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d->checkUsage();
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}
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void DataContainer::checkForUpdate()
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{
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//kDebug() << objectName() << d->dirty;
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if (d->dirty) {
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emit dataUpdated(objectName(), d->data);
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foreach (SignalRelay *relay, d->relays) {
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relay->checkQueueing();
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}
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d->dirty = false;
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}
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}
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void DataContainer::forceImmediateUpdate()
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{
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if (d->dirty) {
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d->dirty = false;
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emit dataUpdated(objectName(), d->data);
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}
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foreach (SignalRelay *relay, d->relays) {
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relay->forceImmediateUpdate();
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}
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}
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uint DataContainer::timeSinceLastUpdate() const
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{
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//FIXME: we still assume it's been <24h
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//and ignore possible daylight savings changes
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return d->updateTs.elapsed();
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}
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void DataContainer::setNeedsUpdate(bool update)
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{
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d->cached = update;
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}
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bool DataContainer::isUsed() const
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{
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return !d->relays.isEmpty() &&
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receivers(SIGNAL(dataUpdated(QString, Plasma::DataEngine::Data))) > 0;
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}
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void DataContainerPrivate::checkUsage()
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{
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if (!checkUsageTimer.isActive()) {
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checkUsageTimer.start(10, q);
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}
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}
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void DataContainer::timerEvent(QTimerEvent * event)
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{
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if (event->timerId() == d->checkUsageTimer.timerId()) {
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if (!isUsed()) {
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// DO NOT CALL ANYTHING AFTER THIS LINE AS IT MAY GET DELETED!
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//kDebug() << objectName() << "is unused";
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emit becameUnused(objectName());
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}
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d->checkUsageTimer.stop();
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} else if (event->timerId() == d->storageTimer.timerId()) {
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d->store();
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d->storageTimer.stop();
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}
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}
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} // Plasma namespace
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#include "moc_datacontainer.cpp"
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