From c6964d5af25d4ec7ed9dbe7674dc4e3896b36ead Mon Sep 17 00:00:00 2001
From: lichao <lichao@aiotlink.com>
Date: 星期五, 16 四月 2021 16:10:02 +0800
Subject: [PATCH] node remove mq if never registered; refactor.
---
src/msg.h | 133 ++++++++++++++++++++++++++++++++++++--------
1 files changed, 109 insertions(+), 24 deletions(-)
diff --git a/src/msg.h b/src/msg.h
index 8fbb0c5..10ad0d2 100644
--- a/src/msg.h
+++ b/src/msg.h
@@ -18,40 +18,125 @@
#ifndef MSG_5BILLZET
#define MSG_5BILLZET
-#include <stdint.h>
+#include "bh_util.h"
+#include "proto.h"
+#include "shm.h"
#include <boost/interprocess/offset_ptr.hpp>
+#include <boost/uuid/uuid_generators.hpp>
+#include <functional>
+#include <stdint.h>
-namespace bhome_shm {
+namespace bhome_msg
+{
+using namespace bhome_shm;
+using namespace bhome::msg; // for serialized data in MsgI
-using namespace boost::interprocess;
-
-// safe to be stored in shared memory.
+// MsgI is safe to be stored in shared memory, so POD data or offset_ptr is required.
// message format: header(meta) + body(data).
-enum MsgType {
- kMsgTypeNull = 0,
- kMsgTypeNormal = 1,
- kMsgTypeMaxValue
+
+typedef boost::uuids::uuid MQId;
+
+// store ref count, msgs shareing the same data should also hold a pointer of the same RefCount object.
+class RefCount : private boost::noncopyable
+{
+public:
+ int Inc()
+ {
+ Guard lk(mutex_);
+ return ++num_;
+ }
+ int Dec()
+ {
+ Guard lk(mutex_);
+ return --num_;
+ }
+ int Get()
+ {
+ Guard lk(mutex_);
+ return num_;
+ }
+
+private:
+ Mutex mutex_;
+ int num_ = 1;
};
-const uint32_t kMsgMetaTag = 0xf1e2d3c4;
+// message content layout: header_size + header + data_size + data
+class MsgI
+{
+private:
+ offset_ptr<void> ptr_;
+ offset_ptr<RefCount> count_;
-struct MsgMetaV1 {
- uint16_t self_size_ = sizeof(MsgMetaV1); // sizeof(*this)
- uint16_t type_ = kMsgTypeNormal; // msg type.
- uint32_t tag_ = kMsgMetaTag;
- uint32_t data_size_ = 0;
- unsigned char src_id_[16] = {0};
- // more fields add at end, must not change
+ typedef std::function<void(void *p, int len)> ToArray;
+ void *Pack(SharedMemory &shm,
+ const uint32_t head_len, const ToArray &headToArray,
+ const uint32_t body_len, const ToArray &bodyToArray);
- MsgMetaV1(){}
- bool Parse(const void *p);
- void Pack(void *p);
+ template <class Body>
+ void *Pack(SharedMemory &shm, const BHMsgHead &head, const Body &body)
+ {
+ return Pack(
+ shm,
+ uint32_t(head.ByteSizeLong()), [&](void *p, int len) { head.SerializeToArray(p, len); },
+ uint32_t(body.ByteSizeLong()), [&](void *p, int len) { body.SerializeToArray(p, len); });
+ }
+
+ bool MakeRC(SharedMemory &shm, void *addr);
+ bool Make(SharedMemory &shm, void *addr);
+
+public:
+ MsgI(void *p = 0, RefCount *c = 0) :
+ ptr_(p), count_(c) {}
+
+ void swap(MsgI &a)
+ {
+ std::swap(ptr_, a.ptr_);
+ std::swap(count_, a.count_);
+ }
+ template <class T = void>
+ T *get() { return static_cast<T *>(ptr_.get()); }
+
+ // AddRef and Release works for both counted and not counted msg.
+ int AddRef() const { return IsCounted() ? count_->Inc() : 1; }
+ int Release(SharedMemory &shm);
+
+ int Count() const { return IsCounted() ? count_->Get() : 1; }
+ bool IsCounted() const { return static_cast<bool>(count_); }
+
+ template <class Body>
+ inline bool MakeRC(SharedMemory &shm, const BHMsgHead &head, const Body &body)
+ {
+ return MakeRC(shm, Pack(shm, head, body));
+ }
+
+ bool EnableRefCount(SharedMemory &shm);
+
+ template <class Body>
+ inline bool Make(SharedMemory &shm, const BHMsgHead &head, const Body &body)
+ {
+ void *p = Pack(shm, head, body);
+ auto NeedRefCount = [&]() { return head.type() == kMsgTypePublish; };
+ return NeedRefCount() ? MakeRC(shm, p) : Make(shm, p);
+ }
+
+ bool ParseHead(BHMsgHead &head) const;
+ template <class Body>
+ bool ParseBody(Body &body) const
+ {
+ auto p = static_cast<char *>(ptr_.get());
+ assert(p);
+ uint32_t size = Get32(p);
+ p += 4;
+ p += size;
+ size = Get32(p);
+ p += 4;
+ return body.ParseFromArray(p, size);
+ }
};
-typedef offset_ptr<void> Msg;
+inline void swap(MsgI &m1, MsgI &m2) { m1.swap(m2); }
-} // namespace bhome_shm
-
-
+} // namespace bhome_msg
#endif // end of include guard: MSG_5BILLZET
--
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