source: trunk/src/gui/embedded/qcopchannel_qws.cpp@ 748

/****************************************************************************
**
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation ([email protected])
**
** This file is part of the QtGui module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights.  These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you have questions regarding the use of this file, please contact
** Nokia at [email protected].
** $QT_END_LICENSE$
**
****************************************************************************/

#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"

QT_BEGIN_NAMESPACE

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 \l{Qt for Embedded Linux}.

    Note that this class is only available in \l{Qt for Embedded Linux}.

    The Qt COmmunication Protocol (QCOP) is a many-to-many protocol
    for transferring messages across registered channels. A channel is
    registered by name, and anyone who wants to can listen to the
    channel as well as send messages through 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, {Qt for Embedded Linux 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;