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110 lines
2.9 KiB
C++
110 lines
2.9 KiB
C++
// Copyright 2023 Dolphin Emulator Project
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// SPDX-License-Identifier: GPL-2.0-or-later
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#pragma once
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#include <functional>
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#include <memory>
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#include <mutex>
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#include <vector>
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#include "Common/Logging/Log.h"
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namespace Common
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{
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struct HookBase
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{
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// A pure virtual destructor makes this class abstract to prevent accidental "slicing".
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virtual ~HookBase() = 0;
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};
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inline HookBase::~HookBase() = default;
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// EventHook is a handle a registered listener holds.
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// When the handle is destroyed, the HookableEvent will automatically remove the listener.
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// If the handle outlives the HookableEvent, the link will be properly disconnected.
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using EventHook = std::unique_ptr<HookBase>;
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// A hookable event system.
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//
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// Define Events as:
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//
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// HookableEvent<std::string, u32> my_lovely_event;
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//
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// Register listeners anywhere you need them as:
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//
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// EventHook my_hook = my_lovely_event.Register([](std::string foo, u32 bar) {
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// fmt::print("I've been triggered with {} and {}", foo, bar)
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// });
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//
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// The hook will be automatically unregistered when the EventHook object goes out of scope.
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// Trigger events by calling Trigger as:
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//
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// my_lovely_event.Trigger("Hello world", 42);
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//
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template <typename... CallbackArgs>
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class HookableEvent
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{
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public:
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using CallbackType = std::function<void(CallbackArgs...)>;
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// Returns a handle that will unregister the listener when destroyed.
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// Note: Attempting to add/remove hooks of the event within the callback itself will NOT work.
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[[nodiscard]] EventHook Register(CallbackType callback)
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{
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DEBUG_LOG_FMT(COMMON, "Registering event hook handler");
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auto handle = std::make_unique<HookImpl>(m_storage, std::move(callback));
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std::lock_guard lg(m_storage->listeners_mutex);
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m_storage->listeners.push_back(handle.get());
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return handle;
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}
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void Trigger(const CallbackArgs&... args)
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{
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std::lock_guard lg(m_storage->listeners_mutex);
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for (auto* const handle : m_storage->listeners)
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std::invoke(handle->callback, args...);
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}
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private:
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struct HookImpl;
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struct Storage
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{
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std::mutex listeners_mutex;
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std::vector<HookImpl*> listeners;
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};
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struct HookImpl final : HookBase
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{
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HookImpl(const std::shared_ptr<Storage> storage, CallbackType func)
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: weak_storage{storage}, callback{std::move(func)}
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{
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}
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~HookImpl() override
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{
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const auto storage = weak_storage.lock();
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if (storage == nullptr)
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{
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DEBUG_LOG_FMT(COMMON, "Handler outlived event hook");
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return;
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}
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DEBUG_LOG_FMT(COMMON, "Removing event hook handler");
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std::lock_guard lg(storage->listeners_mutex);
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std::erase(storage->listeners, this);
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}
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std::weak_ptr<Storage> weak_storage;
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const CallbackType callback;
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};
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// shared_ptr storage allows hooks to forget their connection if they outlive the event itself.
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std::shared_ptr<Storage> m_storage{std::make_shared<Storage>()};
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};
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} // namespace Common
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