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90 lines
2.9 KiB
90 lines
2.9 KiB
/***************************************************************************
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* Copyright (C) 2007 by Ken Werner *
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* ken.werner@web.de *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, write to the *
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* Free Software Foundation, Inc., *
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. *
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***************************************************************************/
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#ifndef THREADEDTRIGGER_H
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#define THREADEDTRIGGER_H
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#include "source.h"
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#include "updateevent.h"
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#include "triggeredsource.h"
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#include <qwaitcondition.h>
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#include <qmutex.h>
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#include <qthread.h>
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#include <qevent.h>
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#include <qobject.h>
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/**
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* ThreadedTrigger calls the fetchValue method of a source asynchronous using a thread
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* @author Ken Werner
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*/
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class ThreadedTrigger : public QObject, QThread{
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Q_OBJECT //macro which activates signals and slots (moc)
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public:
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/**
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* Creates a new ThreadedTrigger
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*/
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ThreadedTrigger(TriggeredSource* inSource, unsigned long inRefreshSleep = 1000);
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virtual ~ThreadedTrigger();
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protected:
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/**
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* fetches tcalls the fetchValue method periodically
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* and sends an UpdateEvent to the source
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*/
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virtual void run();
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protected slots:
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/**
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* enables (starts the thread) or disables (stops the thread)
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* this method is called if mSource gets enabled or disabled
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*/
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void enable(bool inEnable);
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private:
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/**
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* pointer to the TriggeredSource
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**/
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TriggeredSource* mSource;
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/**
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* time in milli seconds between two value fetches
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*/
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unsigned long mRefreshSleep;
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/**
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* indicates whether this thread runs
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*/
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bool mRunning;
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/*
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* this is the condition, on which this thread sleeps
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* mRefreshSleep milliseconds.
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*/
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QWaitCondition mWaitCond;
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/*
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* this mutex ensures that the thread always sleeps on the
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* condition, if we signal it.
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*/
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QMutex mWaitMutex;
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};
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#endif //THREADEDTRIGGER_H
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