/*
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* =====================================================================================
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*
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* Filename: shm_queue.h
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*
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* Description:
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*
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* Version: 1.0
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* Created: 2021年03月25日 10时35分09秒
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* Revision: none
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* Compiler: gcc
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*
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* Author: Li Chao (),
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* Organization:
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*
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* =====================================================================================
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*/
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#ifndef SHM_QUEUE_JE0OEUP3
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#define SHM_QUEUE_JE0OEUP3
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#include "msg.h"
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#include "shm.h"
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#include <atomic>
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#include <boost/circular_buffer.hpp>
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#include <boost/date_time/posix_time/posix_time.hpp>
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namespace bhome_shm
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{
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template <class D>
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using Circular = boost::circular_buffer<D, Allocator<D>>;
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template <class D>
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class SharedQueue : private Circular<D>
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{
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typedef Circular<D> Super;
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Mutex mutex_;
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Cond cond_read_;
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Cond cond_write_;
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Mutex &mutex() { return mutex_; }
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static boost::posix_time::ptime MSFromNow(const int ms)
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{
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using namespace boost::posix_time;
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ptime cur = boost::posix_time::microsec_clock::universal_time();
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return cur + millisec(ms);
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}
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auto TimedReadPred(const int timeout_ms)
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{
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auto endtime = MSFromNow(timeout_ms);
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return [this, endtime](Guard &lock) {
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return (cond_read_.timed_wait(lock, endtime, [&]() { return !this->empty(); }));
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};
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}
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auto TryReadPred()
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{
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return [this](Guard &lock) { return !this->empty(); };
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}
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template <class Pred, class OnData>
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int ReadAllOnCond(Pred const &pred, OnData const &onData)
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{
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Guard lock(this->mutex());
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int n = 0;
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while (pred(lock)) {
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++n;
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onData(this->front());
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this->pop_front();
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this->cond_write_.notify_one();
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}
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return n;
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}
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template <class Pred>
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bool ReadOnCond(D &buf, Pred const &pred)
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{
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int flag = 0;
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auto only_once = [&](Guard &lock) { return flag++ == 0 && pred(lock); };
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auto onData = [&buf](D &d) {
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using std::swap;
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swap(buf, d);
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};
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return ReadAllOnCond(only_once, onData);
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}
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template <class Iter, class Pred, class OnWrite>
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int WriteAllOnCond(Iter begin, Iter end, Pred const &pred, OnWrite const &onWrite)
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{
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if (begin == end) { return 0; }
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int n = 0;
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Guard lock(mutex());
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while (pred(lock)) {
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onWrite(*begin);
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this->push_back(*begin);
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++n;
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cond_read_.notify_one();
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if (++begin == end) {
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break;
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}
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}
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return n;
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}
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public:
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SharedQueue(const uint32_t len, Allocator<D> const &alloc) :
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Super(len, alloc) {}
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template <class Iter, class OnWrite>
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int TryWrite(Iter begin, Iter end, const OnWrite &onWrite)
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{
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auto tryWritePred = [this](Guard &lock) { return !this->full(); };
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return WriteAllOnCond(begin, end, tryWritePred, onWrite);
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}
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template <class OnWrite>
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bool TryWrite(const D &buf, const OnWrite &onWrite) { return TryWrite(&buf, (&buf) + 1, onWrite); }
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bool TryWrite(const D &buf)
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{
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return TryWrite(buf, [](const D &buf) {});
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}
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template <class OnData>
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int ReadAll(const int timeout_ms, OnData const &onData) { return ReadAllOnCond(TimedReadPred(timeout_ms), onData); }
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template <class OnData>
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int TryReadAll(OnData const &onData) { return ReadAllOnCond(TryReadPred(), onData); }
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bool Read(D &buf, const int timeout_ms) { return ReadOnCond(buf, TimedReadPred(timeout_ms)); }
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bool TryRead(D &buf) { return ReadOnCond(buf, TryReadPred()); }
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};
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using namespace bhome_msg;
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class ShmMsgQueue : public StaticDataRef<std::atomic<uint64_t>, ShmMsgQueue>
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{
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typedef ShmObject<SharedQueue<MsgI>> Shmq;
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typedef Shmq::ShmType ShmType;
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typedef Shmq::Data Queue;
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typedef std::function<void()> OnSend;
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public:
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typedef uint64_t MQId;
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static MQId NewId();
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ShmMsgQueue(const MQId id, ShmType &segment, const int len);
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ShmMsgQueue(ShmType &segment, const int len);
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~ShmMsgQueue();
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static bool Remove(SharedMemory &shm, const MQId id);
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MQId Id() const { return id_; }
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ShmType &shm() const { return queue_.shm(); }
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bool Recv(MsgI &msg, const int timeout_ms) { return queue_.data()->Read(msg, timeout_ms); }
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bool TryRecv(MsgI &msg) { return queue_.data()->TryRead(msg); }
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template <class OnData>
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int TryRecvAll(OnData const &onData) { return queue_.data()->TryReadAll(onData); }
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static Queue *Find(SharedMemory &shm, const MQId remote_id);
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static bool TrySend(SharedMemory &shm, const MQId remote_id, const MsgI &msg, OnSend const &onsend = OnSend());
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template <class Iter>
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static int TrySendAll(SharedMemory &shm, const MQId remote_id, const Iter begin, const Iter end, OnSend const &onsend = OnSend())
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{
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Queue *remote = Find(shm, remote_id);
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if (remote) {
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if (onsend) {
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return remote->TryWrite(begin, end, [&onsend](const MsgI &msg) { onsend(); msg.AddRef(); });
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} else {
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return remote->TryWrite(begin, end, [](const MsgI &msg) { msg.AddRef(); });
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}
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} else {
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// SetLestError(eNotFound);
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return 0;
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}
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}
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template <class... Rest>
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bool TrySend(const MQId remote_id, Rest const &...rest) { return TrySend(shm(), remote_id, rest...); }
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template <class... Rest>
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int TrySendAll(const MQId remote_id, Rest const &...rest) { return TrySendAll(shm(), remote_id, rest...); }
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private:
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MQId id_;
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Shmq &queue() { return queue_; }
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Shmq queue_;
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};
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} // namespace bhome_shm
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#endif // end of include guard: SHM_QUEUE_JE0OEUP3
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