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/*
Copyright (C) 2012 Sebastian Herbord. All rights reserved.
This file is part of Mod Organizer.
Mod Organizer 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 3 of the License, or
(at your option) any later version.
Mod Organizer 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 Mod Organizer. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef SINGLEINSTANCE_H
#define SINGLEINSTANCE_H
#include <QObject>
#include <QSharedMemory>
#include <QLocalServer>
/**
* used to ensure only a single instance of Mod Organizer is started and to
* allow ephemeral instances to send messages to the primary (visible) one.
* This way, other instances can start a download in the primary one
**/
class SingleInstance : public QObject
{
Q_OBJECT
public:
enum Flag
{
NoFlags = 0x00,
// if another instance is running, run this one disconnected from the
// shared memory
AllowMultiple = 0x01
};
using Flags = QFlags<Flag>;
explicit SingleInstance(Flags flags, QObject *parent = 0);
/**
* @return true if this instance's job is to forward data to the primary
* instance through shared memory
**/
bool ephemeral() const
{
return m_Ephemeral;
}
// returns true if this is not the primary instance, but was allowed because
// of the AllowMultiple flag
//
bool secondary() const
{
return !m_Ephemeral && !m_OwnsSM;
}
/**
* send a message to the primary instance. This can be used to transmit download urls
*
* @param message message to send
**/
void sendMessage(const QString &message);
signals:
/**
* @brief emitted when an ephemeral instance has sent a message (to us)
*
* @param message the message we received
**/
void messageSent(const QString &message);
public slots:
private slots:
void receiveMessage();
private:
bool m_Ephemeral;
bool m_OwnsSM;
QSharedMemory m_SharedMem;
QLocalServer m_Server;
};
Q_DECLARE_OPERATORS_FOR_FLAGS(SingleInstance::Flags);
#endif // SINGLEINSTANCE_H
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