DobbyTimer.h

/*
* If not stated otherwise in this file or this component's LICENSE file the
* following copyright and licenses apply:
*
* Copyright 2016 Sky UK
*
* 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.
*/
/*
 * File:   DobbyTimer.h
 *
 */
#ifndef DOBBYTIMER_H
#define DOBBYTIMER_H
 
#include <IDGenerator.h>
 
#include <time.h>
 
#include <functional>
#include <set>
#include <thread>
#include <mutex>
#include <chrono>
 
 
// -----------------------------------------------------------------------------
class DobbyTimer
{
public:
    DobbyTimer();
    ~DobbyTimer();
 
public:
    void stop();
 
public:
    int add(const std::chrono::milliseconds& timeout, bool oneShot,
            const std::function<bool()>& func);
    bool remove(int timerId);
 
private:
    void timerThread();
 
    void updateTimerFd() const;
    struct timespec calcAbsTime(const struct timespec& now,
                                const std::chrono::milliseconds& timeout) const;
 
 
private:
    typedef struct tagTimerEntry
    {
        int id;
        bool oneshot;
        struct timespec expiry;
        std::function<bool()> func;
        std::chrono::milliseconds timeout;
 
        bool isLessThanOrEqualTo(const struct timespec& rhs) const
        {
            return (expiry.tv_sec < rhs.tv_sec) ||
                    ((expiry.tv_sec == rhs.tv_sec) &&
                     (expiry.tv_nsec <= rhs.tv_nsec));
        }
 
    } TimerEntry;
 
    class TimerEntryCompare
    {
    public:
        bool operator() (const TimerEntry& a, const TimerEntry& b)
        {
            return (a.expiry.tv_sec < b.expiry.tv_sec) ||
                   ((a.expiry.tv_sec == b.expiry.tv_sec) &&
                    (a.expiry.tv_nsec < b.expiry.tv_nsec));
        }
    };
 
    std::multiset<TimerEntry, TimerEntryCompare> mTimersQueue;
 
private:
    std::recursive_mutex mLock;
    std::thread mThread;
    int mTimerFd;
    int mEventFd;
 
    AICommon::IDGenerator<6> mIdGenerator;
};
 
 
#endif // !defined(DOBBYTIMER_H)