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#include <kapi/devices/device_registry.hpp>
#include <kapi/devices/device.hpp>
#include <kapi/system.hpp>
#include <kstd/memory.hpp>
#include <kstd/print.hpp>
#include <kstd/string.hpp>
#include <kstd/vector.hpp>
#include <optional>
#include <string_view>
#include <utility>
namespace kapi::devices
{
namespace
{
auto constinit instance = std::optional<device_registry>{};
}
auto device_registry::init() -> void
{
if (instance)
{
system::panic("[OS:DEV] Device registry has already been initialized");
}
instance = device_registry{};
}
auto device_registry::get() -> device_registry &
{
if (!instance)
{
system::panic("[OS:DEV] Device registry has not been initialized");
}
return *instance;
}
auto device_registry::add(kstd::shared_ptr<device> device) -> bool
{
if (!device)
{
return false;
}
kstd::println("[OS:DEV] Registering device {}", device->name());
auto added = false;
// TODO: lock the registry
auto found = m_devices.find(device->name());
if (found != m_devices.end())
{
if (!found->second.expired())
{
added = false;
}
found->second = device;
added = true;
}
else
{
added = m_devices.emplace(device->name(), device).second;
}
// TODO: unlock registry
if (!added)
{
return false;
}
// TODO: consider if we need to lock the registry observers here, since somebody may add an observer in the meantime
// once multiple codepaths can run at the same time.
for (auto const & observer : m_observers)
{
if (auto locked_observer = observer.lock())
{
locked_observer->on_device_added(device);
}
}
// TODO: lock registry
erase_if(m_observers, [](auto const & observer) { return observer.expired(); });
// TODO: unlock registry
return true;
}
auto device_registry::remove(device & device) -> bool
{
// TODO: lock registry
auto found = m_devices.find(device.name());
if (found == m_devices.end())
{
return false;
}
auto locked = found->second.lock();
if (!locked || locked.get() != &device)
{
return false;
}
found->second = kstd::weak_ptr<struct device>{};
// TODO: unlock registry
kstd::println("[OS:DEV] Unregistering device {}", device.name());
for (auto const & observer : m_observers)
{
if (auto locked_observer = observer.lock())
{
locked_observer->on_device_removed(device);
}
}
// TODO: lock registry
erase_if(m_observers, [](auto const & observer) { return observer.expired(); });
// TODO: unlock registry
return true;
}
auto device_registry::find(std::string_view name) const -> kstd::shared_ptr<device>
{
// TODO: lock registry
auto found = m_devices.find(kstd::string{name});
if (found == m_devices.end())
{
return nullptr;
}
return found->second.lock();
}
auto device_registry::all() const -> kstd::vector<kstd::shared_ptr<device>>
{
// TODO: lock registry
auto result = kstd::vector<kstd::shared_ptr<device>>{};
for (auto const & [name, weak_device] : m_devices)
{
if (auto device = weak_device.lock())
{
result.push_back(std::move(device));
}
}
return result;
}
auto device_registry::subscribe(kstd::weak_ptr<device_registry_observer> observer) -> void
{
// TODO: lock registry
erase_if(m_observers, [](auto const & observer) { return observer.expired(); });
m_observers.push_back(observer);
}
} // namespace kapi::devices
namespace kapi::test_support::devices
{
auto deinit_device_registry() -> void
{
kapi::devices::instance.reset();
}
} // namespace kapi::test_support::devices
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