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/*
KMix -- KDE's full featured mini mixer
Copyright (C) 2012 Christian Esken <esken@kde.org>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, 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 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 "ControlManager.h"
#include "core/GlobalConfig.h"
#include "kmix_debug.h"
#include <QMutableListIterator>
ControlManager ControlManager::instanceSingleton;
ControlManager &ControlManager::instance()
{
return instanceSingleton;
}
ControlManager::ControlManager()
{
listenersChanged = false;
}
/**
* Announce a change for one or all mixers.
*
* @param mixerId The mixerId. Use an empty QString() to announce a change for all mixers
* @param changeType A bit array of ControlChangeType flags
* @param sourceId Only for logging
*
*/
void ControlManager::announce(const QString &mixerId, ControlManager::ChangeType changeType, const QString &sourceId)
{
bool listenersModified = false;
QSet<Listener *> processedListeners;
do
{
listenersModified = false;
for (QList<Listener *>::const_iterator it = listeners.constBegin(); it!=listeners.constEnd(); ++it)
{
Listener *listener = (*it);
bool mixerIsOfInterest = listener->getMixerId().isEmpty() || mixerId.isEmpty()
|| listener->getMixerId() == mixerId;
bool listenerAlreadyProcesed = processedListeners.contains(listener);
if ( listenerAlreadyProcesed )
{
if (GlobalConfig::instance().data.debugControlManager)
qCDebug(KMIX_LOG) << "Skipping already processed listener";
continue;
}
if (mixerIsOfInterest && listener->getChangeType() == changeType)
{
bool success = QMetaObject::invokeMethod(listener->getTarget(),
"controlsChange",
Qt::DirectConnection,
Q_ARG(ControlManager::ChangeType, changeType));
if (GlobalConfig::instance().data.debugControlManager)
{
qCDebug(KMIX_LOG) << "Listener" << listener->getSourceId()
<< "is interested in" << mixerId
<< "type" << changeType;
}
if (!success)
{
qCCritical(KMIX_LOG) << "Listener failed to send to " << listener->getTarget()->metaObject()->className();
}
processedListeners.insert(listener);
if (listenersChanged)
{
// The invokeMethod() above has changed the listeners => my Iterator is invalid => restart loop
if (GlobalConfig::instance().data.debugControlManager)
qCDebug(KMIX_LOG) << "Listeners modified => restart loop";
listenersChanged = false;
listenersModified = true;
break; // break inner loop => restart via outer loop
}
}
}
}
while (listenersModified);
if (GlobalConfig::instance().data.debugControlManager)
{
qCDebug(KMIX_LOG)
<< "Announcing" << changeType << "for"
<< (mixerId.isEmpty() ? "all cards" : mixerId) << "by" << sourceId;
}
}
/**
* Adds a listener for the given mixerId and changeType.
* Listeners are informed about all corresponding changes via a signal.
* Listeners are not informed about changes that originate from oneself (according to sourceId).
*
* @param mixerId The id of the Mixer you are interested in
* @param changetType The changeType of interest
* @param target The QObject, where the notification signal is sent to. It must implement the SLOT controlChanged(QString mixerId,ControlManager::ChangeType changeType).
* @param sourceId Only for logging
*/
void ControlManager::addListener(const QString &mixerId, ControlManager::ChangeTypes changeTypes,
QObject *target, const QString &sourceId)
{
if (GlobalConfig::instance().data.debugControlManager)
{
qCDebug(KMIX_LOG)
<< "Listening to" << changeTypes << "for"
<< (mixerId.isEmpty() ? "all cards" : mixerId) << "by" << sourceId
<< "sent to" << target;
}
for (ControlManager::ChangeType ct = ChangeType::First; ct!=ChangeType::Last;
ct = static_cast<ControlManager::ChangeType>(ct << 1))
{
if (changeTypes & ct)
{
// Add all listeners.
Listener *listener = new Listener(mixerId, ct, target, sourceId);
listeners.append(listener);
listenersChanged = true;
}
}
if (GlobalConfig::instance().data.debugControlManager)
{
qCDebug(KMIX_LOG) << "We now have" << listeners.size() << "listeners";
}
}
/**
* Removes all listeners of the given target.
* @param target The QObject that was used to register via addListener()
* @param sourceId Optional: Only for logging
*/
void ControlManager::removeListener(QObject *target, const QString &sourceId)
{
QString src = sourceId;
if (src.isEmpty()) src = target->metaObject()->className();
QMutableListIterator<Listener *> it(listeners);
while (it.hasNext())
{
Listener *listener = it.next();
if (listener->getTarget() == target)
{
if (GlobalConfig::instance().data.debugControlManager)
qCDebug(KMIX_LOG)
<< "Stop Listening of" << listener->getSourceId() << "requested by" << src << "from" << target;
it.remove();
// Hint: As we have actual objects no explicit delete is needed
listenersChanged = true;
}
}
}
void ControlManager::warnUnexpectedChangeType(ControlManager::ChangeType type, QObject *obj)
{
qCWarning(KMIX_LOG) << "Unexpected type " << type << " received by " << obj->metaObject()->className();
}
void ControlManager::shutdownNow()
{
if (GlobalConfig::instance().data.debugControlManager)
qCDebug(KMIX_LOG) << "Shutting down ControlManager";
for (QList<Listener *>::const_iterator it = listeners.constBegin(); it!=listeners.constEnd(); ++it)
{
Listener *listener = (*it);
if (GlobalConfig::instance().data.debugControlManager)
qCDebug(KMIX_LOG)
<< "Listener still connected. Closing it. source" << listener->getSourceId()
<< "target" << listener->getTarget()->metaObject()->className();
}
}
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