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

249 lines
7.4 KiB
C++

/*
* Copyright © 2009 Rob Scheepmaker <r.scheepmaker@student.utwente.nl>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Library General Public License version 2 as
* published by the Free Software Foundation
*
* 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 "remotedataengine_p.h"
#include "remoteservice_p.h"
#include "../remote/accessmanager.h"
#include "../remote/serviceaccessjob.h"
#include "../service.h"
#include "../servicejob.h"
#include <QTimer>
#include <QUuid>
#include <qurl.h>
#include <qurlpathinfo.h>
namespace Plasma
{
RemoteDataEngine::RemoteDataEngine(const QUrl &location, QObject* parent, const QVariantList& args)
: Plasma::DataEngine(parent, args),
m_service(0),
m_location(location),
m_uuid("")
{
if (!location.isEmpty()) {
setLocation(location);
} else {
#ifndef NDEBUG
kDebug() << "LOCATION IS EMPTY";
#endif
}
}
RemoteDataEngine::~RemoteDataEngine()
{
}
void RemoteDataEngine::setLocation(const QUrl &location)
{
m_location = location;
setMinimumPollingInterval(1000);
setPollingInterval(5000);
m_uuid = QUuid::createUuid().toString();
Service *service = Service::access(location);
connect(service, SIGNAL(serviceReady(Plasma::Service*)),
this, SLOT(serviceReady(Plasma::Service*)));
}
Plasma::Service* RemoteDataEngine::serviceForSource(const QString& source)
{
if (m_serviceForSource.contains(source)) {
return m_serviceForSource[source];
} else {
RemoteService *service = new RemoteService(this);
initRemoteService(source, service);
return service;
}
}
void RemoteDataEngine::initRemoteService(const QString &source, RemoteService *service)
{
if (m_service) {
KConfigGroup op = m_service->operationDescription("ServiceForSource");
op.writeEntry("SourceName", source);
m_service->startOperationCall(op);
m_serviceForSource[source] = service;
} else {
m_pendingServices[source] = service;
}
}
void RemoteDataEngine::serviceReady(Plasma::Service *service)
{
m_service = service;
KConfigGroup op = m_service->operationDescription("GetSourceNames");
m_service->startOperationCall(op);
connect(m_service, SIGNAL(finished(Plasma::ServiceJob*)),
this, SLOT(remoteCallFinished(Plasma::ServiceJob*)));
//FIXME: every 5s? this MUST become push rather than pull
QTimer *timer = new QTimer(this);
timer->setInterval(5000);
connect(timer, SIGNAL(timeout()), this, SLOT(updateSources()));
timer->start();
}
QStringList RemoteDataEngine::sources() const
{
return m_sources.toList();
}
void RemoteDataEngine::remoteCallFinished(Plasma::ServiceJob *job)
{
if (job->operationName() == "GetSourceNames") {
#ifndef NDEBUG
kDebug() << "get source names";
#endif
const QSet<QString> oldsources = m_sources;
m_sources = QSet<QString>::fromList(job->result().toStringList());
//first check if there are sources that have to be removed:
foreach (const QString &source, oldsources) {
if (!m_sources.contains(source)) {
#ifndef NDEBUG
kDebug() << "source no longer exists... remove that data.";
#endif
removeSource(source);
emit sourceRemoved(source);
}
}
//are there sources that have to be added?
{
// we have to check the current container dict, because we may have added
// an empty data set in a call to sourceRequestEvent before the service was
// ready; in this case, it will already exist in the engine's container
// collection and be listed in pendingSources.
// we also have to check oldSources since it may be in there, but never
// actually connected to from the local side
const SourceDict s = containerDict();
foreach (const QString &source, m_sources) {
if (!oldsources.contains(source) && !s.contains(source)) {
#ifndef NDEBUG
kDebug() << "new source = " << source;
#endif
emit sourceAdded(source);
}
}
}
//and now check and update any pending resources
foreach (const QString &pendingSource, m_pendingSources) {
createSource(pendingSource);
}
m_pendingSources.clear();
} else if (job->operationName() == "GetSource") {
QString source = job->parameters().value("SourceName").toString();
#ifndef NDEBUG
kDebug() << "setting data for " << source;
#endif
bool newSource = !m_sources.contains(source);
if (job->result().type() == QVariant::Bool && job->result().toBool() == false) {
#ifndef NDEBUG
kDebug() << "there is no update";
#endif
if (newSource) {
// the source doesn't exist on the remote side!
removeSource(source);
emit sourceRemoved(source);
m_pendingServices.remove(source);
}
} else {
if (newSource) {
m_sources.insert(source);
emit sourceAdded(source);
RemoteService *rs = m_pendingServices.value(source);
if (rs) {
m_pendingServices.remove(source);
initRemoteService(source, rs);
}
}
setData(source, static_cast<Plasma::DataEngine::Data>(job->result().toHash()));
}
} else {
QString source = job->parameters().value("SourceName").toString();
#ifndef NDEBUG
kDebug() << "setting serviceForSource for " << source;
#endif
QString resource = job->result().toString();
QUrlPathInfo loc(m_location);
loc.setFileName(resource);
RemoteService *rs = m_serviceForSource.value(source);
if (rs) {
rs->setLocation(loc.url());
} else {
#ifndef NDEBUG
kDebug() << "no such service?" << source;
#endif
}
}
}
bool RemoteDataEngine::updateSourceEvent(const QString &source)
{
if (!m_service) {
return false;
}
KConfigGroup op = m_service->operationDescription("GetSource");
op.writeEntry("SourceName", source);
op.writeEntry("UUID", m_uuid);
m_service->startOperationCall(op);
return false;
}
bool RemoteDataEngine::sourceRequestEvent(const QString &source)
{
setData(source, Data());
if (m_service) {
createSource(source);
} else {
m_pendingSources.append(source);
}
return true;
}
void RemoteDataEngine::createSource(const QString &source)
{
KConfigGroup op = m_service->operationDescription("GetSource");
op.writeEntry("SourceName", source);
op.writeEntry("UUID", m_uuid);
m_service->startOperationCall(op);
}
void RemoteDataEngine::updateSources()
{
if (m_service) {
KConfigGroup op = m_service->operationDescription("GetSourceNames");
m_service->startOperationCall(op);
}
}
}
#include "moc_remotedataengine_p.cpp"