Files
Waybar/include/modules/sni/host.hpp
Austin Horstman 4c71b2bf9f perf(memory): optimize C++ string operations to reduce heap fragmentation
- Replaced pass-by-value std::string parameters with const std::string&
or std::string_view to prevent SSO overallocations.

- Refactored static mapping functions in UPower to return
std::string_view instead of constructing std::string literals, enabling
perfect cache locality.

- Optimized string concatenation in hot loops (network IPs, inhibitor
lists, sway window marks) by using std::string::append() and
pre-reserving capacity instead of overloaded operator+ which produces
temporary heap instances.

These optimizations reduce high-frequency memory churn and overall heap
fragmentation within the main rendering loops.

Signed-off-by: Austin Horstman <khaneliman12@gmail.com>
2026-03-02 22:54:07 -06:00

49 lines
1.5 KiB
C++

#pragma once
#include <dbus-status-notifier-watcher.h>
#include <giomm.h>
#include <glibmm/refptr.h>
#include <json/json.h>
#include <tuple>
#include "bar.hpp"
#include "modules/sni/item.hpp"
namespace waybar::modules::SNI {
class Host {
public:
Host(const std::size_t id, const Json::Value&, const Bar&,
const std::function<void(std::unique_ptr<Item>&)>&,
const std::function<void(std::unique_ptr<Item>&)>&);
~Host();
private:
void busAcquired(const Glib::RefPtr<Gio::DBus::Connection>&, Glib::ustring);
void nameAppeared(const Glib::RefPtr<Gio::DBus::Connection>&, Glib::ustring,
const Glib::ustring&);
void nameVanished(const Glib::RefPtr<Gio::DBus::Connection>&, Glib::ustring);
static void proxyReady(GObject*, GAsyncResult*, gpointer);
static void registerHost(GObject*, GAsyncResult*, gpointer);
static void itemRegistered(SnWatcher*, const gchar*, gpointer);
static void itemUnregistered(SnWatcher*, const gchar*, gpointer);
std::tuple<std::string, std::string> getBusNameAndObjectPath(const std::string);
void addRegisteredItem(const std::string& service);
std::vector<std::unique_ptr<Item>> items_;
const std::string bus_name_;
const std::string object_path_;
std::size_t bus_name_id_;
std::size_t watcher_id_;
GCancellable* cancellable_ = nullptr;
SnWatcher* watcher_ = nullptr;
const Json::Value& config_;
const Bar& bar_;
const std::function<void(std::unique_ptr<Item>&)> on_add_;
const std::function<void(std::unique_ptr<Item>&)> on_remove_;
};
} // namespace waybar::modules::SNI