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/home/tommi/cxxtools/include/cxxtools/eventloop.h

/*
 * Copyright (C) 2006-2007 Laurentiu-Gheorghe Crisan
 * Copyright (C) 2006-2008 Marc Boris Duerner
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * As a special exception, you may use this file as part of a free
 * software library without restriction. Specifically, if other files
 * instantiate templates or use macros or inline functions from this
 * file, or you compile this file and link it with other files to
 * produce an executable, this file does not by itself cause the
 * resulting executable to be covered by the GNU General Public
 * License. This exception does not however invalidate any other
 * reasons why the executable file might be covered by the GNU Library
 * General Public License.
 * 
 * This library 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
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */
#ifndef CXXTOOLS_SYSTEM_EVENTLOOP_H
#define CXXTOOLS_SYSTEM_EVENTLOOP_H

#include <cxxtools/event.h>
#include <cxxtools/signal.h>
#include <cxxtools/allocator.h>
#include <cxxtools/api.h>
#include <cxxtools/mutex.h>
#include <cxxtools/selector.h>
#include <cxxtools/eventsink.h>
#include <deque>

namespace cxxtools {

    class Selectable;

    class EventLoopBase : public SelectorBase
                        , public EventSink
    {
        public:
            virtual ~EventLoopBase()
            {}

            void run()
            { this->onRun(); }

            void processEvents()
            { this->onProcessEvents(); }

            void exit()
            { this->onExit(); }

            void setIdleTimeout(size_t msecs)
            { _timeout = msecs; }

            unsigned int idleTimeout() const
            { return _timeout; }

            Signal<> timeout;

            Signal<const Event&> event;

            Signal<> exited;

        protected:
            EventLoopBase()
            : _timeout(WaitInfinite)
            {}

            virtual void onRun() = 0;

            virtual void onExit() = 0;

            virtual void onProcessEvents() = 0;

        private:
            size_t _timeout;
    };

    class CXXTOOLS_API EventLoop : public EventLoopBase
    {
        public:
            EventLoop();

            virtual ~EventLoop();

        protected:
            virtual void onAdd( Selectable& s );

            virtual void onRemove( Selectable& s );

            virtual void onReinit(Selectable& s);

            virtual void onChanged(Selectable& s);

            virtual void onRun();

            virtual bool onWait(std::size_t msecs);

            virtual void onWake();

            virtual void onExit();

            virtual void onCommitEvent(const Event& event);

            virtual void onProcessEvents();

        private:
            bool _exitLoop;
            SelectorImpl* _selector;
            Allocator _allocator;
            std::deque<Event* > _eventQueue;
            RecursiveMutex _queueMutex;
    };

} // namespace cxxtools

#endif

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