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Diffstat (limited to 'src/sources/threadedtrigger.h')
-rw-r--r-- | src/sources/threadedtrigger.h | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/src/sources/threadedtrigger.h b/src/sources/threadedtrigger.h new file mode 100644 index 0000000..8d84d5f --- /dev/null +++ b/src/sources/threadedtrigger.h @@ -0,0 +1,89 @@ +/*************************************************************************** + * Copyright (C) 2007 by Ken Werner * + * ken.werner@web.de * + * * + * This program 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 2 of the License, or * + * (at your option) any later version. * + * * + * This program 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 this program; if not, write to the * + * Free Software Foundation, Inc., * + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. * + ***************************************************************************/ + +#ifndef THREADEDTRIGGER_H +#define THREADEDTRIGGER_H + +#include "source.h" +#include "updateevent.h" +#include "triggeredsource.h" +#include <qwaitcondition.h> +#include <qmutex.h> +#include <qthread.h> +#include <qevent.h> +#include <qobject.h> + +/** + * ThreadedTrigger calls the fetchValue method of a source asynchronous using a thread + * @author Ken Werner + */ +class ThreadedTrigger : public QObject, QThread{ + Q_OBJECT //macro which activates signals and slots (moc) +public: + /** + * Creates a new ThreadedTrigger + */ + ThreadedTrigger(TriggeredSource* inSource, unsigned long inRefreshSleep = 1000); + + virtual ~ThreadedTrigger(); + +protected: + /** + * fetches tcalls the fetchValue method periodically + * and sends an UpdateEvent to the source + */ + virtual void run(); + +protected slots: + /** + * enables (starts the thread) or disables (stops the thread) + * this method is called if mSource gets enabled or disabled + */ + void enable(bool inEnable); + +private: + /** + * pointer to the TriggeredSource + **/ + TriggeredSource* mSource; + + /** + * time in milli seconds between two value fetches + */ + unsigned long mRefreshSleep; + + /** + * indicates whether this thread runs + */ + bool mRunning; + + /* + * this is the condition, on which this thread sleeps + * mRefreshSleep milliseconds. + */ + QWaitCondition mWaitCond; + + /* + * this mutex ensures that the thread always sleeps on the + * condition, if we signal it. + */ + QMutex mWaitMutex; +}; +#endif //THREADEDTRIGGER_H |