/*
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* =====================================================================================
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*
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* Filename: msg.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24日 16时49分20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 MSG_5BILLZET
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#define MSG_5BILLZET
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#include <stdint.h>
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#include "shm.h"
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#include <boost/interprocess/offset_ptr.hpp>
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#include <boost/uuid/uuid_generators.hpp>
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#include "bhome_msg.pb.h"
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namespace bhome_msg {
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using namespace bhome_shm;
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using namespace bhome::msg; // for serialized data in MsgI
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// MsgI is safe to be stored in shared memory, so POD data or offset_ptr is required.
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// message format: header(meta) + body(data).
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typedef boost::uuids::uuid MQId;
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// store ref count, msgs shareing the same data should also hold a pointer of the same RefCount object.
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class RefCount : private boost::noncopyable
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{
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public:
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int Inc() { Guard lk(mutex_); return ++num_; }
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int Dec() { Guard lk(mutex_); return --num_; }
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int Get() { Guard lk(mutex_); return num_; }
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private:
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Mutex mutex_;
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int num_ = 1;
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};
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BHMsg MakeRequest(const MQId &src_id, const void *data, const size_t size);
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BHMsg MakeReply(const void *data, const size_t size);
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BHMsg MakeSub(const std::vector<std::string> &topics);
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BHMsg MakeUnsub(const std::vector<std::string> &topics);
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BHMsg MakePub(const std::string &topic, const void *data, const size_t size);
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class MsgI {
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private:
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offset_ptr<void> ptr_;
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offset_ptr<RefCount> count_;
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bool BuildSubOrUnsub(SharedMemory &shm, const std::vector<std::string> &topics, const MsgType sub_unsub);
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public:
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MsgI(void *p=0, RefCount *c=0):ptr_(p), count_(c) {}
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void swap(MsgI &a) { std::swap(ptr_, a.ptr_); std::swap(count_, a.count_); }
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template <class T = void> T *get() { return static_cast<T*>(ptr_.get()); }
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// AddRef and Release works for both counted and not counted msg.
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int AddRef() const { return IsCounted() ? count_->Inc() : 1; }
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int Release(SharedMemory &shm);
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int Count() const{ return IsCounted() ? count_->Get() : 1; }
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bool IsCounted() const { return static_cast<bool>(count_); }
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bool Make(SharedMemory &shm, const BHMsg &msg);
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bool MakeRC(SharedMemory &shm, const BHMsg &msg);
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bool Unpack(BHMsg &msg) const;
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};
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inline void swap(MsgI &m1, MsgI &m2) { m1.swap(m2); }
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} // namespace bhome_msg
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#endif // end of include guard: MSG_5BILLZET
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