qcopchannel_qws.cpp

奇趣公司比较新的qt/emd版本

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#include "qcopchannel_qws.h"

#ifndef QT_NO_COP

#include "qwsdisplay_qws.h"
#include "qwscommand_qws_p.h"
#include "qwindowsystem_qws.h"
#include "qwindowsystem_p.h"
#include "qlist.h"
#include "qmap.h"
#include "qdatastream.h"
#include "qpointer.h"
#include "qmutex.h"

#include "qdebug.h"

typedef QMap<QString, QList<QWSClient*> > QCopServerMap;
static QCopServerMap *qcopServerMap = 0;

class QCopServerRegexp
{
public:
    QCopServerRegexp( const QString& channel, QWSClient *client );
    QCopServerRegexp( const QCopServerRegexp& other );

    QString channel;
    QWSClient *client;
    QRegExp regexp;
};

QCopServerRegexp::QCopServerRegexp( const QString& channel, QWSClient *client )
{
    this->channel = channel;
    this->client = client;
    this->regexp = QRegExp( channel, Qt::CaseSensitive, QRegExp::Wildcard );
}

QCopServerRegexp::QCopServerRegexp( const QCopServerRegexp& other )
{
    channel = other.channel;
    client = other.client;
    regexp = other.regexp;
}

typedef QList<QCopServerRegexp> QCopServerRegexpList;
static QCopServerRegexpList *qcopServerRegexpList = 0;

typedef QMap<QString, QList< QPointer<QCopChannel> > > QCopClientMap;
static QCopClientMap *qcopClientMap = 0;

Q_GLOBAL_STATIC(QMutex, qcopClientMapMutex)

// Determine if a channel name contains wildcard characters.
static bool containsWildcards( const QString& channel )
{
    return channel.contains(QLatin1Char('*'));
}

class QCopChannelPrivate
{
public:
    QString channel;
};

/*!
    \class QCopChannel
    \ingroup qws

    \brief The QCopChannel class provides communication capabilities
    between clients in Qtopia Core.

    Note that this class is only available in \l {Qtopia Core}.

    QCOP is a many-to-many communication protocol for transferring
    messages on various channels. A channel is identified by a name,
    and anyone who wants to can listen to it as well as send messages
    to it. The QCOP protocol allows clients to communicate both within
    the same address space and between different processes.

    To send messages to a given channel, QCopChannel provides the
    static send() function. Using this function alone, the messages
    are queued until Qt re-enters the event loop. To immediately flush
    all queued messages to the registered listeners, call the static
    flush() function.

    To listen to the traffic on a given channel, you typically
    instantiate a QCopChannel object for the given channel and connect
    to its received() signal that is emitted whenever there is
    incoming data.  Use the static isRegistered() function to query
    the server for the existence of a given channel. QCopChannel
    provides the channel() function returning the name of this
    QCopChannel object's channel.

    In additon, QCopChannel provides the virtual receive() function
    that can be reimplemented to filter the incoming messages and
    data. The default implementation simply emits the received()
    signal.

    \sa QWSServer, QWSClient, {Qtopia Core Architecture}
*/

/*!
    Constructs a QCopChannel object for the specified \a channel, with
    the given \a parent. Once created, the channel is registered by
    the server.

    \sa isRegistered(), channel()
*/

QCopChannel::QCopChannel(const QString& channel, QObject *parent) :
    QObject(parent)
{
    init(channel);
}

#ifdef QT3_SUPPORT
/*!
    Use the two argument overload instead, and call the
    QObject::setObjectName() function to \a name the instance.
*/
QCopChannel::QCopChannel(const QString& channel, QObject *parent, const char *name) :
    QObject(parent)
{
    setObjectName(QString::fromAscii(name));
    init(channel);
}
#endif

void QCopChannel::init(const QString& channel)
{
    d = new QCopChannelPrivate;
    d->channel = channel;

    if (!qt_fbdpy) {
        qFatal("QCopChannel: Must construct a QApplication "
                "before QCopChannel");
        return;
    }

    {
	QMutexLocker locker(qcopClientMapMutex());

	if (!qcopClientMap)
	    qcopClientMap = new QCopClientMap;

	// do we need a new channel list ?
	QCopClientMap::Iterator it = qcopClientMap->find(channel);
	if (it != qcopClientMap->end()) {
	    it.value().append(this);
	    return;
	}

	it = qcopClientMap->insert(channel, QList< QPointer<QCopChannel> >());
	it.value().append(QPointer<QCopChannel>(this));
    }

    // inform server about this channel
    qt_fbdpy->registerChannel(channel);
}

/*!
  \internal

  Resend all channel registrations
  */
void QCopChannel::reregisterAll()
{
    if(qcopClientMap)
        for(QCopClientMap::Iterator iter = qcopClientMap->begin();
            iter != qcopClientMap->end();
            ++iter)
            qt_fbdpy->registerChannel(iter.key());
}

/*!
    Destroys this QCopChannel object.

    The server is notified that this particular listener has closed
    its connection. The server will keep the channel open until the
    last registered listener detaches.

    \sa isRegistered(), channel()
*/

QCopChannel::~QCopChannel()
{
    QMutexLocker locker(qcopClientMapMutex());
    QCopClientMap::Iterator it = qcopClientMap->find(d->channel);
    Q_ASSERT(it != qcopClientMap->end());
    it.value().removeAll(this);
    // still any clients connected locally ?
    if (it.value().isEmpty()) {
        QByteArray data;
        QDataStream s(&data, QIODevice::WriteOnly);
        s << d->channel;
        if (qt_fbdpy)
            send(QLatin1String(""), QLatin1String("detach()"), data);
        qcopClientMap->remove(d->channel);
    }

    delete d;
}

/*!
    Returns the name of this object's channel.

    \sa isRegistered()
*/

QString QCopChannel::channel() const
{
    return d->channel;
}

/*!
    \fn void QCopChannel::receive(const QString& message, const QByteArray &data)

    Processes the incoming \a message and \a data.

    This function is called by the server when this object's channel
    receives new messages. Note that the default implementation simply
    emits the received() signal; reimplement this function to process
    the incoming \a message and \a data.

    Note that the format of the given \a data has to be well defined
    in order to extract the information it contains. In addition, 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. For example:

    \code
        void MyClass::receive(const QString &message, const QByteArray &data)
        {
            QDataStream in(data);
            if (message == "execute(QString,QString)") {
                QString cmd;
                QString arg;
                in >> cmd >> arg;
                ...
            } else if (message == "delete(QString)") {
                QString fileName;
                in >> fileName;
                ...
            } else {
                ...
            }
        }
    \endcode

    The above code assumes that the \c message is a DCOP-style
    function signature and the \c data contains the function's
    arguments.

    \sa send(), channel(), received()
 */
void QCopChannel::receive(const QString& msg, const QByteArray &data)
{
    emit received(msg, data);
}

/*!
    \fn void QCopChannel::received(const QString& message, const QByteArray &data)

    This signal is emitted whenever this object's channel receives new
    messages (i.e., it is emitted by the receive() function), passing
    the incoming \a message and \a data as parameters.

    \sa receive(), channel()
*/

/*!
    Queries the server for the existence of the given \a channel. Returns true
    if the channel is registered; otherwise returns false.