EventSwitch.h

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/*
 * EventSwitch.h
 *
 * Copyright (C) 2011 IBR, TU Braunschweig
 *
 * Written-by: Johannes Morgenroth <morgenroth@ibr.cs.tu-bs.de>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

#ifndef EVENTSWITCH_H_
#define EVENTSWITCH_H_

#include "Component.h"
#include "core/Event.h"
#include <ibrcommon/Exceptions.h>
#include <ibrcommon/thread/Mutex.h>
#include <ibrcommon/thread/Conditional.h>
#include <ibrcommon/TimeMeasurement.h>

#include <list>
#include <queue>
#include <map>

namespace dtn
{
        namespace core
        {
                class EventSwitch : public dtn::daemon::IntegratedComponent
                {
                private:
                        EventSwitch();
                        virtual ~EventSwitch();

                        bool _running;
                        bool _shutdown;

                        virtual const std::string getName() const;

                        class Task
                        {
                        public:
                                Task(EventProcessor &proc, dtn::core::Event *evt);
                                ~Task();

                                EventProcessor &processor;
                                dtn::core::Event *event;
                        };

                        class Worker : public ibrcommon::JoinableThread
                        {
                        public:
                                Worker(EventSwitch &sw, bool profiling);
                                ~Worker();

                                bool isStalled();

                        protected:
                                void run() throw ();
                                virtual void __cancellation() throw ();

                        private:
                                EventSwitch &_switch;
                                bool _running;
                                ibrcommon::TimeMeasurement _tm;
                                bool _inprogress;
                                bool _profiling;
                        };

                        class WatchDog : public ibrcommon::JoinableThread
                        {
                        public:
                                WatchDog(EventSwitch &sw, std::list<Worker*> &workers);
                                ~WatchDog();

                                void up();
                                void down();

                        protected:
                                void run() throw ();
                                virtual void __cancellation() throw ();

                        private:
                                EventSwitch &_switch;
                                std::list<Worker*> &_workers;

                                bool _running;
                                ibrcommon::Conditional _cond;
                        };

                        ibrcommon::Conditional _queue_cond;
                        std::queue<Task*> _queue;
                        std::queue<Task*> _prio_queue;
                        std::queue<Task*> _low_queue;

                        WatchDog _wd;
                        std::list<Worker*> _wlist;

                        ibrcommon::TimeMeasurement _tm;
                        bool _inprogress;

                        void process(ibrcommon::TimeMeasurement &tm, bool &inprogress, bool profiling);

                protected:
                        virtual void componentUp() throw ();
                        virtual void componentDown() throw ();

                        bool isStalled();

                public:
                        static EventSwitch& getInstance();
                        void loop(size_t threads, bool profiling = false);

                        bool empty() const;

                        void shutdown();

                        static void queue(EventProcessor &proc, Event *evt);

                        friend class Worker;
                };
        }
}

#endif /* EVENTSWITCH_H_ */