WallClock.cpp

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/*
 * Clock.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 "core/WallClock.h"
#include "core/TimeEvent.h"
#include <ibrdtn/utils/Clock.h>
#include <ibrcommon/thread/MutexLock.h>
#include <ibrcommon/Logger.h>

namespace dtn
{
        namespace core
        {
                WallClock::WallClock(const dtn::data::Timeout &frequency) : _frequency(frequency), _next(0), _timer(*this, frequency)
                {
                }

                WallClock::~WallClock()
                {
                }

                void WallClock::sync()
                {
                        try {
                                ibrcommon::MutexLock l(*this);
                                wait();
                        } catch (const ibrcommon::Conditional::ConditionalAbortException &ex) {

                        }
                }

                void WallClock::componentUp() throw ()
                {
                        // routine checked for throw() on 15.02.2013
                        if(_timer.isRunning())
                        {
                                _timer.reset();
                        }
                        else
                        {
                                try {
                                        _timer.start();
                                } catch (const ibrcommon::ThreadException &ex) {
                                        IBRCOMMON_LOGGER_TAG("WallClock", error) << ex.what() << IBRCOMMON_LOGGER_ENDL;
                                }
                        }
                }

                void WallClock::componentDown() throw ()
                {
                        _timer.pause();
                }

                size_t WallClock::timeout(ibrcommon::Timer*)
                {
                        dtn::data::Timestamp ts = dtn::utils::Clock::getMonotonicTimestamp();

                        if (ts >= _next)
                        {
                                TimeEvent::raise(dtn::utils::Clock::getTime(), TIME_SECOND_TICK);
                                _next = ts.get<size_t>() + _frequency;

                                ibrcommon::MutexLock l(*this);
                                signal(true);
                        }

                        return _frequency;
                }

                const std::string WallClock::getName() const
                {
                        return "WallClock";
                }
        }
}