From 38be0d13830efd2d98281c645c3a60afe05ffece Mon Sep 17 00:00:00 2001 From: Qt by Nokia Date: Wed, 27 Apr 2011 12:05:43 +0200 Subject: Initial import from the monolithic Qt. This is the beginning of revision history for this module. If you want to look at revision history older than this, please refer to the Qt Git wiki for how to use Git history grafting. At the time of writing, this wiki is located here: http://qt.gitorious.org/qt/pages/GitIntroductionWithQt If you have already performed the grafting and you don't see any history beyond this commit, try running "git log" with the "--follow" argument. Branched from the monolithic repo, Qt master branch, at commit 896db169ea224deb96c59ce8af800d019de63f12 --- src/dbus/qdbuspendingreply.cpp | 281 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 281 insertions(+) create mode 100644 src/dbus/qdbuspendingreply.cpp (limited to 'src/dbus/qdbuspendingreply.cpp') diff --git a/src/dbus/qdbuspendingreply.cpp b/src/dbus/qdbuspendingreply.cpp new file mode 100644 index 0000000000..4dc1c77b8e --- /dev/null +++ b/src/dbus/qdbuspendingreply.cpp @@ -0,0 +1,281 @@ +/**************************************************************************** +** +** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies). +** All rights reserved. +** Contact: Nokia Corporation (qt-info@nokia.com) +** +** This file is part of the QtDBus module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** No Commercial Usage +** This file contains pre-release code and may not be distributed. +** You may use this file in accordance with the terms and conditions +** contained in the Technology Preview License Agreement accompanying +** this package. +** +** 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. +** +** If you have questions regarding the use of this file, please contact +** Nokia at qt-info@nokia.com. +** +** +** +** +** +** +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "qdbuspendingreply.h" +#include "qdbuspendingcall_p.h" +#include "qdbusmetatype.h" + +#ifndef QT_NO_DBUS + +/*! + \class QDBusPendingReply + \inmodule QtDBus + \since 4.5 + + \brief The QDBusPendingReply class contains the reply to an asynchronous method call + + The QDBusPendingReply is a template class with up to 8 template + parameters. Those parameters are the types that will be used to + extract the contents of the reply's data. + + This class is similar in functionality to QDBusReply, but with two + important differences: + + \list + \o QDBusReply accepts exactly one return type, whereas + QDBusPendingReply can have from 1 to 8 types + \o QDBusReply only works on already completed replies, whereas + QDBusPendingReply allows one to wait for replies from pending + calls + \endlist + + Where with QDBusReply you would write: + + \snippet doc/src/snippets/code/src_qdbus_qdbusreply.cpp 0 + + with QDBusPendingReply, the equivalent code (including the blocking + wait for the reply) would be: + + \snippet doc/src/snippets/code/src.qdbus.qdbuspendingreply.cpp 0 + + For method calls that have more than one output argument, with + QDBusReply, you would write: + + \snippet doc/src/snippets/code/src_qdbus_qdbusreply.cpp 1 + + whereas with QDBusPendingReply, all of the output arguments should + be template parameters: + + \snippet doc/src/snippets/code/src.qdbus.qdbuspendingreply.cpp 2 + + QDBusPendingReply objects can be associated with + QDBusPendingCallWatcher objects, which emit signals when the reply + arrives. + + \sa QDBusPendingCallWatcher, QDBusReply, + QDBusAbstractInterface::asyncCall() +*/ + +/*! + \fn QDBusPendingReply::QDBusPendingReply() + + Creates an empty QDBusPendingReply object. Without assigning a + QDBusPendingCall object to this reply, QDBusPendingReply cannot do + anything. All functions return their failure values. +*/ + +/*! + \fn QDBusPendingReply::QDBusPendingReply(const QDBusPendingReply &other) + + Creates a copy of the \a other QDBusPendingReply object. Just like + QDBusPendingCall and QDBusPendingCallWatcher, this QDBusPendingReply + object will share the same pending call reference. All copies + share the same return values. +*/ + +/*! + \fn QDBusPendingReply::QDBusPendingReply(const QDBusPendingCall &call) + + Creates a QDBusPendingReply object that will take its contents from + the \a call pending asynchronous call. This QDBusPendingReply object + will share the same pending call reference as \a call. +*/ + +/*! + \fn QDBusPendingReply::QDBusPendingReply(const QDBusMessage &message) + + Creates a QDBusPendingReply object that will take its contents from + the message \a message. In this case, this object will be already + in its finished state and the reply's contents will be accessible. + + \sa isFinished() +*/ + +/*! + \fn QDBusPendingReply &QDBusPendingReply::operator=(const QDBusPendingReply &other) + + Makes a copy of \a other and drops the reference to the current + pending call. If the current reference is to an unfinished pending + call and this is the last reference, the pending call will be + canceled and there will be no way of retrieving the reply's + contents, when they arrive. +*/ + +/*! + \fn QDBusPendingReply &QDBusPendingReply::operator=(const QDBusPendingCall &call) + + Makes this object take its contents from the \a call pending call + and drops the reference to the current pending call. If the + current reference is to an unfinished pending call and this is the + last reference, the pending call will be canceled and there will + be no way of retrieving the reply's contents, when they arrive. +*/ + +/*! + \fn QDBusPendingReply &QDBusPendingReply::operator=(const QDBusMessage &message) + + Makes this object take its contents from the \a message message + and drops the reference to the current pending call. If the + current reference is to an unfinished pending call and this is the + last reference, the pending call will be canceled and there will + be no way of retrieving the reply's contents, when they arrive. + + After this function is finished, the QDBusPendingReply object will + be in its "finished" state and the \a message contents will be + accessible. + + \sa isFinished() +*/ + +/*! + \fn int QDBusPendingReply::count() const + + Return the number of arguments the reply is supposed to have. This + number matches the number of non-void template parameters in this + class. + + If the reply arrives with a different number of arguments (or with + different types), it will be transformed into an error reply + indicating a bad signature. +*/ + +/*! + \fn QVariant QDBusPendingReply::argumentAt(int index) const + + Returns the argument at position \a index in the reply's + contents. If the reply doesn't have that many elements, this + function's return value is undefined (will probably cause an + assertion failure), so it is important to verify that the + processing is finished and the reply is valid. +*/ + +/*! + \fn Type QDBusPendingReply::argumentAt() const + + Returns the argument at position \c Index (which is a template + parameter) cast to type \c Type. This function uses template code + to determine the proper \c Type type, according to the type list + used in the construction of this object. + + Note that, if the reply hasn't arrived, this function causes the + calling thread to block until the reply is processed. +*/ + +/*! + \fn T1 QDBusPendingReply::value() const + + Returns the first argument in this reply, cast to type \c T1 (the + first template parameter of this class). This is equivalent to + calling argumentAt<0>(). + + This function is provided as a convenience, matching the + QDBusReply::value() function. + + Note that, if the reply hasn't arrived, this function causes the + calling thread to block until the reply is processed. +*/ + +/*! + \fn QDBusPendingReply::operator T1() const + + Returns the first argument in this reply, cast to type \c T1 (the + first template parameter of this class). This is equivalent to + calling argumentAt<0>(). + + This function is provided as a convenience, matching the + QDBusReply::value() function. + + Note that, if the reply hasn't arrived, this function causes the + calling thread to block until the reply is processed. +*/ + +/*! + \fn void QDBusPendingReply::waitForFinished() + + Suspends the execution of the calling thread until the reply is + received and processed. After this function returns, isFinished() + should return true, indicating the reply's contents are ready to + be processed. + + \sa QDBusPendingCallWatcher::waitForFinished() +*/ + +QDBusPendingReplyData::QDBusPendingReplyData() + : QDBusPendingCall(0) // initialize base class empty +{ +} + +QDBusPendingReplyData::~QDBusPendingReplyData() +{ +} + +void QDBusPendingReplyData::assign(const QDBusPendingCall &other) +{ + QDBusPendingCall::operator=(other); +} + +void QDBusPendingReplyData::assign(const QDBusMessage &message) +{ + d = new QDBusPendingCallPrivate(QDBusMessage(), 0); // drops the reference to the old one + d->replyMessage = message; +} + +QVariant QDBusPendingReplyData::argumentAt(int index) const +{ + if (d) + d->waitForFinished(); // bypasses "const" + + Q_ASSERT_X(d && index >= 0 && index < d->replyMessage.arguments().count(), + "QDBusPendingReply::argumentAt", + "Index out of bounds"); + + return d->replyMessage.arguments().at(index); +} + +void QDBusPendingReplyData::setMetaTypes(int count, const int *types) +{ + Q_ASSERT(d); + QMutexLocker locker(&d->mutex); + d->setMetaTypes(count, types); + d->checkReceivedSignature(); +} + +#endif // QT_NO_DBUS -- cgit v1.2.3