/*
 * =====================================================================================
 *
 *       Filename:  shm_queue.h
 *
 *    Description:  
 *
 *        Version:  1.0
 *        Created:  2021年03月25日 10时35分09秒
 *       Revision:  none
 *       Compiler:  gcc
 *
 *         Author:  Li Chao (), 
 *   Organization:  
 *
 * =====================================================================================
 */

#ifndef SHM_QUEUE_JE0OEUP3
#define SHM_QUEUE_JE0OEUP3

#include "shm.h"
#include "msg.h"
#include <boost/circular_buffer.hpp>
#include <boost/date_time/posix_time/posix_time.hpp>

namespace bhome_shm {
	
template <class D> using Circular = boost::circular_buffer<D, Allocator<D> >;

typedef boost::uuids::uuid MQId;

template <class D>
class SyncedQueue : private Circular<D>
{
    typedef Circular<D> Super;
    Mutex mutex_;
    Cond cond_read_;
    Cond cond_write_;
    Mutex & mutex() { return mutex_; }
    const MQId id_;

    static boost::posix_time::ptime MSFromNow(const int ms)
    {
        using namespace boost::posix_time;
        ptime cur = boost::posix_time::microsec_clock::universal_time();
        return cur + millisec(ms);
    }

public:
    // template <class...T> SyncedQueue(const MQId &id, T&&...t):Super(t...), id_(id) {}
    SyncedQueue(const MQId &id, const uint32_t len, Allocator<D> const& alloc):Super(len, alloc), id_(id) {}
    using Super::size;
    using Super::capacity;
    const MQId &Id() const { return id_; }
    bool Write(const D &buf, const int timeout_ms) {
        Guard lock(mutex());
        if (cond_write_.timed_wait(lock, MSFromNow(timeout_ms), [&]() { return !this->full(); })) {
            this->push_back(buf);
            cond_read_.notify_one();
            return true;
        } else {
            return false;
        }
    }

    bool Read(D &buf, const int timeout_ms){
        Guard lock(mutex());
        if (cond_read_.timed_wait(lock, MSFromNow(timeout_ms), [&]() { return !this->empty(); })) {
            using std::swap;
            swap(buf, this->front());
            this->pop_front();
            cond_write_.notify_one();
            return true;
        } else {
            return false;
        }
    }
};

class ShmMsgQueue : private ShmObject<SyncedQueue<Msg> >
{
    typedef ShmObject<SyncedQueue<Msg> > SharedQueue;
    typedef SharedQueue::Data Queue;
    bool Write(const Msg &buf, const int timeout_ms) { return data()->Write(buf, timeout_ms); }
    bool Read(Msg &buf, const int timeout_ms) { return data()->Read(buf, timeout_ms); }
public:
    ShmMsgQueue(const MQId &id, ShmType &segment, const uint32_t len);
    ShmMsgQueue(ShmType &segment, const uint32_t len);
    ~ShmMsgQueue();
    bool Send(const MQId &remote_id, const void *data, const size_t size, const int timeout_ms);
    bool Recv(MQId &source_id, void *&data, size_t &size, const int timeout_ms);
    const MQId &Id() const { return data()->Id(); }
    bool Send(const MQId &remote_id, const Msg &msg, const int timeout_ms);
};

} // namespace bhome_shm

#endif // end of include guard: SHM_QUEUE_JE0OEUP3