qcopchannel_qws.cpp

奇趣公司比较新的qt/emd版本

    \sa channel(), send()
*/

bool QCopChannel::isRegistered(const QString&  channel)
{
    QByteArray data;
    QDataStream s(&data, QIODevice::WriteOnly);
    s << channel;
    if (!send(QLatin1String(""), QLatin1String("isRegistered()"), data))
        return false;

    QWSQCopMessageEvent *e = qt_fbdpy->waitForQCopResponse();
    bool known = e->message == "known";
    delete e;
    return known;
}

/*!
    \fn bool QCopChannel::send(const QString& channel, const QString& message)
    \overload
*/

bool QCopChannel::send(const QString& channel, const QString& msg)
{
    QByteArray data;
    return send(channel, msg, data);
}

/*!
    \fn bool QCopChannel::send(const QString& channel, const QString& message,
                       const QByteArray &data)

    Sends the given \a message on the specified \a channel with the
    given \a data. The message will be distributed to all clients
    subscribed to the channel. Returns true if the message is sent
    successfully; otherwise returns false.

    It is recommended to use the DCOP convention. This is not a
    requirement, but you must ensure that the sender and receiver
    agree on the argument types.

    Note that QDataStream provides a convenient way to fill the byte
    array with auxiliary data. For example:

    \code
        QByteArray data;
        QDataStream out(&data, QIODevice::WriteOnly);
        out << QString("cat") << QString("file.txt");
        QCopChannel::send("System/Shell", "execute(QString,QString)", data);
    \endcode

    In the code above the channel is \c "System/Shell". The \c message
    is an arbitrary string, but in the example we've used the DCOP
    convention of passing a function signature. Such a signature is
    formatted as \c "functionname(types)" where \c types is a list of
    zero or more comma-separated type names, with no whitespace, no
    consts and no pointer or reference marks, i.e. no "*" or "&".

    \sa receive(), isRegistered()
*/

bool QCopChannel::send(const QString& channel, const QString& msg,
                       const QByteArray &data)
{
    if (!qt_fbdpy) {
        qFatal("QCopChannel::send: Must construct a QApplication "
                "before using QCopChannel");
        return false;
    }

    qt_fbdpy->sendMessage(channel, msg, data);

    return true;
}

/*!
    \since 4.2

    Flushes all queued messages to the registered listeners.

    Note that this function returns false if no QApplication has been
    constructed, otherwise it returns true.

    \sa send()

*/
bool QCopChannel::flush()
{
    if (!qt_fbdpy) {
        qFatal("QCopChannel::flush: Must construct a QApplication "
                "before using QCopChannel");
        return false;
    }

    qt_fbdpy->flushCommands();

    return true;
}

class QWSServerSignalBridge : public QObject {
  Q_OBJECT

public:
  void emitNewChannel(const QString& channel);
  void emitRemovedChannel(const QString& channel);

  signals:
  void newChannel(const QString& channel);
  void removedChannel(const QString& channel);
};

void QWSServerSignalBridge::emitNewChannel(const QString& channel){
  emit newChannel(channel);
}

void QWSServerSignalBridge::emitRemovedChannel(const QString& channel) {
  emit removedChannel(channel);
}

/*!
    \internal
    Server side: subscribe client \a cl on channel \a ch.
*/

void QCopChannel::registerChannel(const QString& ch, QWSClient *cl)
{
    if (!qcopServerMap)
        qcopServerMap = new QCopServerMap;

    // do we need a new channel list ?
    QCopServerMap::Iterator it = qcopServerMap->find(ch);
    if (it == qcopServerMap->end())
      it = qcopServerMap->insert(ch, QList<QWSClient*>());

    // If the channel name contains wildcard characters, then we also
    // register it on the server regexp matching list.
    if (containsWildcards( ch )) {
	QCopServerRegexp item(ch, cl);
	if (!qcopServerRegexpList)
	    qcopServerRegexpList = new QCopServerRegexpList;
	qcopServerRegexpList->append( item );
    }

    // If this is the first client in the channel, announce the channel as being created.
    if (it.value().count() == 0) {
      QWSServerSignalBridge* qwsBridge = new QWSServerSignalBridge();
      connect(qwsBridge, SIGNAL(newChannel(QString)), qwsServer, SIGNAL(newChannel(QString)));
      qwsBridge->emitNewChannel(ch);
      delete qwsBridge;
    }

    it.value().append(cl);
}

/*!
    \internal
    Server side: unsubscribe \a cl from all channels.
*/

void QCopChannel::detach(QWSClient *cl)
{
    if (!qcopServerMap)
        return;

    QCopServerMap::Iterator it = qcopServerMap->begin();
    for (; it != qcopServerMap->end(); ++it) {
      if (it.value().contains(cl)) {
        it.value().removeAll(cl);
        // If this was the last client in the channel, announce the channel as dead.
        if (it.value().count() == 0) {
          QWSServerSignalBridge* qwsBridge = new QWSServerSignalBridge();
          connect(qwsBridge, SIGNAL(removedChannel(QString)), qwsServer, SIGNAL(removedChannel(QString)));
          qwsBridge->emitRemovedChannel(it.key());
          delete qwsBridge;
        }
      }
    }

    if (!qcopServerRegexpList)
	return;

    QCopServerRegexpList::Iterator it2 = qcopServerRegexpList->begin();
    while(it2 != qcopServerRegexpList->end()) {
	if ((*it2).client == cl)
	    it2 = qcopServerRegexpList->erase(it2);
	else
	    ++it2;
    }
}

/*!
    \internal
    Server side: transmit the message to all clients registered to the
    specified channel.
*/

void QCopChannel::answer(QWSClient *cl, const QString& ch,
                          const QString& msg, const QByteArray &data)
{
    // internal commands
    if (ch.isEmpty()) {
        if (msg == QLatin1String("isRegistered()")) {
            QString c;
            QDataStream s(data);
            s >> c;
            bool known = qcopServerMap && qcopServerMap->contains(c)
                        && !((*qcopServerMap)[c]).isEmpty();
            QLatin1String ans = QLatin1String(known ? "known" : "unkown");
            QWSServerPrivate::sendQCopEvent(cl, QLatin1String(""),
                                            ans, data, true);
            return;
        } else if (msg == QLatin1String("detach()")) {
            QString c;
            QDataStream s(data);
            s >> c;
            Q_ASSERT(qcopServerMap);
            QCopServerMap::Iterator it = qcopServerMap->find(c);
            if (it != qcopServerMap->end()) {
                //Q_ASSERT(it.value().contains(cl));
                it.value().removeAll(cl);
                if (it.value().isEmpty()) {
                  // If this was the last client in the channel, announce the channel as dead
                  QWSServerSignalBridge* qwsBridge = new QWSServerSignalBridge();
                  connect(qwsBridge, SIGNAL(removedChannel(QString)), qwsServer, SIGNAL(removedChannel(QString)));
                  qwsBridge->emitRemovedChannel(it.key());
                  delete qwsBridge;
                  qcopServerMap->erase(it);
                }
            }
	    if (qcopServerRegexpList && containsWildcards(c)) {
		// Remove references to a wildcarded channel.
		QCopServerRegexpList::Iterator it
		    = qcopServerRegexpList->begin();
		while(it != qcopServerRegexpList->end()) {
		    if ((*it).client == cl && (*it).channel == c)
			it = qcopServerRegexpList->erase(it);
		    else
			++it;
		}
	    }
            return;
        }
        qWarning("QCopChannel: unknown internal command %s", qPrintable(msg));
        QWSServerPrivate::sendQCopEvent(cl, QLatin1String(""),
                                        QLatin1String("bad"), data);
        return;
    }

    if (qcopServerMap) {
        QList<QWSClient*> clist = qcopServerMap->value(ch);
        for (int i=0; i < clist.size(); ++i) {
            QWSClient *c = clist.at(i);
            QWSServerPrivate::sendQCopEvent(c, ch, msg, data);
        }
    }

    if(qcopServerRegexpList && !containsWildcards(ch)) {
	// Search for wildcard matches and forward the message on.
	QCopServerRegexpList::ConstIterator it = qcopServerRegexpList->constBegin();
	for (; it != qcopServerRegexpList->constEnd(); ++it) {
	    if ((*it).regexp.exactMatch(ch)) {
		QByteArray newData;
		{
		    QDataStream stream
			(&newData, QIODevice::WriteOnly | QIODevice::Append);
		    stream << ch;
		    stream << msg;
		    stream << data;
		    // Stream is flushed and closed at this point.
		}
		QWSServerPrivate::sendQCopEvent
		    ((*it).client, (*it).channel,
		     QLatin1String("forwardedMessage(QString,QString,QByteArray)"),
		     newData);
	    }
	}
    }
}

/*!
    \internal
    Client side: distribute received event to the QCop instance managing the
    channel.
*/
void QCopChannel::sendLocally(const QString& ch, const QString& msg,
                                const QByteArray &data)
{
    Q_ASSERT(qcopClientMap);

    // filter out internal events
    if (ch.isEmpty())
        return;

    // feed local clients with received data
    QList< QPointer<QCopChannel> > clients;
    {
	QMutexLocker locker(qcopClientMapMutex());
	clients = (*qcopClientMap)[ch];
    }
    for (int i = 0; i < clients.size(); ++i) {
	QCopChannel *channel = (QCopChannel *)clients.at(i);
	if ( channel )
	    channel->receive(msg, data);
    }
}
#include "qcopchannel_qws.moc"

#endif