/*
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* =====================================================================================
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*
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* Filename: shm_queue.cpp
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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34分42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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#include "shm_queue.h"
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#include "bh_util.h"
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#include <boost/uuid/uuid_generators.hpp>
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#include <boost/uuid/uuid_io.hpp>
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// TODO !!! add garbage collection, and handshake with gc-center.
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// smart pointer will NOT work if user crash.
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// problem of process release mq: client query success; server exits; client send.
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// client query success; server exits; client send.
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namespace bhome_shm
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{
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using namespace bhome_msg;
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using namespace boost::interprocess;
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using namespace boost::uuids;
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namespace
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{
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std::string MsgQIdToName(const MQId &id) { return "shmq" + to_string(id); }
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// MQId EmptyId() { return nil_uuid(); }
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MQId NewId() { return random_generator()(); }
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const int AdjustMQLength(const int len)
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{
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const int kMaxLength = 10000;
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const int kDefaultLen = 12;
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if (len <= 0) {
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return kDefaultLen;
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} else if (len < kMaxLength) {
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return len;
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} else {
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return kMaxLength;
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}
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}
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} // namespace
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// ShmMsgQueue memory usage: (320 + 16*length) bytes, length >= 2
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ShmMsgQueue::ShmMsgQueue(const MQId &id, ShmType &segment, const int len) :
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Super(segment, MsgQIdToName(id), AdjustMQLength(len), segment.get_segment_manager()),
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id_(id)
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{
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}
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ShmMsgQueue::ShmMsgQueue(ShmType &segment, const int len) :
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ShmMsgQueue(NewId(), segment, len) {}
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ShmMsgQueue::~ShmMsgQueue() {}
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bool ShmMsgQueue::Remove(SharedMemory &shm, const MQId &id)
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{
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return Super::Remove(shm, MsgQIdToName(id));
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}
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bool ShmMsgQueue::Send(SharedMemory &shm, const MQId &remote_id, const MsgI &msg, const int timeout_ms, OnSend const &onsend)
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{
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Queue *remote = Find(shm, MsgQIdToName(remote_id));
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if (remote) {
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return remote->Write(msg, timeout_ms, [&onsend](const MsgI &msg) { onsend(); msg.AddRef(); });
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} else {
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// SetLestError(eNotFound);
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return false;
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}
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}
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bool ShmMsgQueue::Send(SharedMemory &shm, const MQId &remote_id, const MsgI &msg, const int timeout_ms)
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{
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Queue *remote = Find(shm, MsgQIdToName(remote_id));
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if (remote) {
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return remote->Write(msg, timeout_ms, [](const MsgI &msg) { msg.AddRef(); });
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} else {
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// SetLestError(eNotFound);
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return false;
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}
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}
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// Test shows that in the 2 cases:
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// 1) build msg first, then find remote queue;
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// 2) find remote queue first, then build msg;
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// 1 is about 50% faster than 2, maybe cache related.
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// bool ShmMsgQueue::Recv(MsgI &imsg, BHMsgHead &head, const int timeout_ms)
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// {
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// if (Read(imsg, timeout_ms)) {
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// // DEFER1(imsg.Release(shm()););
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// return imsg.ParseHead(head);
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// } else {
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// return false;
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// }
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// }
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} // namespace bhome_shm
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