perf_counter_ptr perf_counters::get_counter(const char* app, const char *section, const char *name, dsn_perf_counter_type_t flags, const char *dsptr, bool create_if_not_exist /*= false*/)
{
std::string full_name;
perf_counter::build_full_name(app, section, name, full_name);
if (create_if_not_exist)
{
utils::auto_write_lock l(_lock);
auto it = _counters.find(full_name);
if (it == _counters.end())
{
dassert(_quick_counters_empty_slots.size() > 0,
"no more slots for perf counters, please increase [core] perf_counter_max_count"
);
uint64_t idx = _quick_counters_empty_slots.front();
_quick_counters_empty_slots.pop();
// increase version
idx++;
perf_counter_ptr counter = _factory(app, section, name, flags, dsptr);
counter->_index = idx; // index << 32 | version
_quick_counters[idx >> 32] = counter.get();
_counters.emplace(std::piecewise_construct, std::forward_as_tuple(full_name), std::forward_as_tuple(counter));
return counter;
}
else
{
perf_counter_ptr perf_counters::get_counter(const char *section, const char *name, perf_counter_type flags, bool create_if_not_exist /*= false*/)
{
char section_name[512] = "";
//::GetModuleBaseNameA(::GetCurrentProcess(), ::GetModuleHandleA(nullptr), section_name, 256);
//strcat(section_name, ".");
strcat(section_name, section);
if (create_if_not_exist)
{
auto_write_lock l(_lock);
auto it = _counters.find(section_name);
if (it == _counters.end())
{
same_section_counters sc;
it = _counters.insert(all_counters::value_type(section_name, sc)).first;
}
auto it2 = it->second.find(name);
if (it2 == it->second.end())
{
perf_counter_ptr counter(_factory(section_name, name, flags));
it->second.insert(same_section_counters::value_type(name, std::make_pair(counter, flags)));
return counter;
}
else
{
dassert (it2->second.second == flags, "counters with the same name %s.%s with differnt types", section_name, name);
return it2->second.first;
}
}
else
{
auto_read_lock l(_lock);
auto it = _counters.find(section_name);
if (it == _counters.end())
return nullptr;
auto it2 = it->second.find(name);
if (it2 == it->second.end())
return nullptr;
return it2->second.first;
}
}
T& get() { return *(_value? _value : _value = _factory()); }
T const& get() const { return *(_value? _value : _value = _factory()); }
