Timer.cpp

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/*
 * Timer.cpp
 *
 * 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.
 *
 */

#include "ibrcommon/config.h"
#include "ibrcommon/thread/Timer.h"
#include "ibrcommon/thread/MutexLock.h"

#include <iostream>
#include <queue>
#include <utility>
#include <sstream>

namespace ibrcommon
{
        Timer::time_t Timer::get_current_time()
        {
                ::time_t rawtime = ::time(NULL);
                tm * ptm;

                ptm = ::gmtime ( &rawtime );

                return ::mktime(ptm);
        }

        Timer::Timer(TimerCallback &callback, size_t timeout)
         : _state(TIMER_UNSET), _callback(callback), _timeout(timeout * 1000)
        {
        }

        Timer::~Timer()
        {
                stop();
                join();
        }

        void Timer::__cancellation() throw ()
        {
                MutexLock l(_state);
                _state.setState(TIMER_CANCELLED);
                _state.abort();
        }

        void Timer::set(size_t timeout)
        {
                MutexLock l(_state);
                _timeout = timeout * 1000;
                _state.setState(TIMER_RESET);
        }

        void Timer::reset()
        {
                MutexLock l(_state);
                _state.setState(TIMER_RESET);
        }

        void Timer::pause()
        {
                MutexLock l(_state);
                _state.setState(TIMER_STOPPED);
        }

        size_t Timer::getTimeout() const
        {
                return _timeout / 1000;
        }

        void Timer::run() throw ()
        {
                MutexLock l(_state);
                _state.setState(TIMER_RUNNING);

                while (_state.ifState(TIMER_RUNNING) || _state.ifState(TIMER_STOPPED))
                {
                        try {
                                if(_state.ifState(TIMER_RUNNING))
                                {
                                        if(_timeout > 0)
                                        {
                                                _state.wait(_timeout);
                                        }
                                        else
                                        {
                                                throw ibrcommon::Conditional::ConditionalAbortException(ibrcommon::Conditional::ConditionalAbortException::COND_ABORT);
                                        }
                                }
                                else
                                {
                                        _state.wait();
                                }

                                // got signal, check for reset request
                                if (_state.ifState(TIMER_RESET))
                                {
                                        _state.setState(TIMER_RUNNING);
                                }
                                else if(!_state.ifState(TIMER_STOPPED))
                                {
                                        // stop the timer
                                        _state.setState(TIMER_CANCELLED);
                                }
                        }
                        catch (const ibrcommon::Conditional::ConditionalAbortException &ex)
                        {
                                switch (ex.reason)
                                {
                                        case ibrcommon::Conditional::ConditionalAbortException::COND_TIMEOUT:
                                        {
                                                try
                                                {
                                                        // timeout exceeded, call callback method
                                                        _timeout = _callback.timeout(this) * 1000;
                                                        _state.setState(TIMER_RUNNING);
                                                }
                                                catch(const StopTimerException &ex)
                                                {
                                                        // stop the timer
                                                        _state.setState(TIMER_STOPPED);
                                                }
                                                break;
                                        }

                                        case ibrcommon::Conditional::ConditionalAbortException::COND_ABORT:
                                        case ibrcommon::Conditional::ConditionalAbortException::COND_ERROR:
                                        {
                                                _state.setState(TIMER_CANCELLED);
                                                return;
                                        }
                                }
                        }

                        yield();
                }
        }
}