1 files changed, 475 insertions, 0 deletions
diff --git a/Src/external_dependencies/openmpt-trunk/common/ComponentManager.cpp b/Src/external_dependencies/openmpt-trunk/common/ComponentManager.cpp
new file mode 100644
index 00000000..4c558ddc
--- /dev/null
+++ b/Src/external_dependencies/openmpt-trunk/common/ComponentManager.cpp
@@ -0,0 +1,475 @@
+/*
+ * ComponentManager.cpp
+ * --------------------
+ * Purpose: Manages loading of optional components.
+ * Notes  : (currently none)
+ * Authors: Joern Heusipp
+ *          OpenMPT Devs
+ * The OpenMPT source code is released under the BSD license. Read LICENSE for more details.
+ */
+
+#include "stdafx.h"
+#include "ComponentManager.h"
+
+#include "mpt/mutex/mutex.hpp"
+
+#include "Logging.h"
+
+OPENMPT_NAMESPACE_BEGIN
+
+
+ComponentBase::ComponentBase(ComponentType type)
+	: m_Type(type)
+	, m_Initialized(false)
+	, m_Available(false)
+{
+	return;
+}
+
+
+ComponentBase::~ComponentBase()
+{
+	return;
+}
+
+
+void ComponentBase::SetInitialized()
+{
+	m_Initialized = true;
+}
+
+
+void ComponentBase::SetAvailable()
+{
+	m_Available = true;
+}
+
+
+ComponentType ComponentBase::GetType() const
+{
+	return m_Type;
+}
+
+
+bool ComponentBase::IsInitialized() const
+{
+	return m_Initialized;
+}
+
+
+bool ComponentBase::IsAvailable() const
+{
+	return m_Initialized && m_Available;
+}
+
+
+mpt::ustring ComponentBase::GetVersion() const
+{
+	return mpt::ustring();
+}
+
+
+void ComponentBase::Initialize()
+{
+	if(IsInitialized())
+	{
+		return;
+	}
+	if(DoInitialize())
+	{
+		SetAvailable();
+	}
+	SetInitialized();
+}
+
+
+#if defined(MODPLUG_TRACKER)
+
+
+ComponentLibrary::ComponentLibrary(ComponentType type)
+	: ComponentBase(type)
+	, m_BindFailed(false)
+{
+	return;
+}
+
+
+ComponentLibrary::~ComponentLibrary()
+{
+	return;
+}
+
+
+bool ComponentLibrary::AddLibrary(const std::string &libName, const mpt::LibraryPath &libPath)
+{
+	if(m_Libraries[libName].IsValid())
+	{
+		// prefer previous
+		return true;
+	}
+	mpt::Library lib(libPath);
+	if(!lib.IsValid())
+	{
+		return false;
+	}
+	m_Libraries[libName] = lib;
+	return true;
+}
+
+
+void ComponentLibrary::ClearLibraries()
+{
+	m_Libraries.clear();
+}
+
+
+void ComponentLibrary::SetBindFailed()
+{
+	m_BindFailed = true;
+}
+
+
+void ComponentLibrary::ClearBindFailed()
+{
+	m_BindFailed = false;
+}
+
+
+bool ComponentLibrary::HasBindFailed() const
+{
+	return m_BindFailed;
+}
+
+
+mpt::Library ComponentLibrary::GetLibrary(const std::string &libName) const
+{
+	const auto it = m_Libraries.find(libName);
+	if(it == m_Libraries.end())
+	{
+		return mpt::Library();
+	}
+	return it->second;
+}
+
+
+#endif // MODPLUG_TRACKER
+
+
+#if MPT_COMPONENT_MANAGER
+
+
+ComponentFactoryBase::ComponentFactoryBase(const std::string &id, const std::string &settingsKey)
+	: m_ID(id)
+	, m_SettingsKey(settingsKey)
+{
+	return;
+}
+
+
+ComponentFactoryBase::~ComponentFactoryBase()
+{
+	return;
+}
+
+
+std::string ComponentFactoryBase::GetID() const
+{
+	return m_ID;
+}
+
+
+std::string ComponentFactoryBase::GetSettingsKey() const
+{
+	return m_SettingsKey;
+}
+
+
+void ComponentFactoryBase::PreConstruct() const
+{
+	MPT_LOG_GLOBAL(LogInformation, "Components", 
+		MPT_UFORMAT("Constructing Component {}")
+			( mpt::ToUnicode(mpt::Charset::ASCII, m_ID)
+			)
+		);
+}
+
+
+void ComponentFactoryBase::Initialize(ComponentManager &componentManager, std::shared_ptr<IComponent> component) const
+{
+	if(componentManager.IsComponentBlocked(GetSettingsKey()))
+	{
+		return;
+	}
+	componentManager.InitializeComponent(component);
+}
+
+
+// Global list of component register functions.
+// We do not use a global scope static list head because the corresponding
+//  mutex would be no POD type and would thus not be safe to be usable in
+//  zero-initialized state.
+// Function scope static initialization is guaranteed to be thread safe
+//  in C++11.
+// We use this implementation to be future-proof.
+// MSVC currently does not exploit the possibility of using multiple threads
+//  for global lifetime object's initialization.
+// An implementation with a simple global list head and no mutex at all would
+//  thus work fine for MSVC (currently).
+
+static mpt::mutex & ComponentListMutex()
+{
+	static mpt::mutex g_ComponentListMutex;
+	return g_ComponentListMutex;
+}
+
+static ComponentListEntry * & ComponentListHead()
+{
+	static ComponentListEntry g_ComponentListHeadEmpty = {nullptr, nullptr};
+	static ComponentListEntry *g_ComponentListHead = &g_ComponentListHeadEmpty;
+	return g_ComponentListHead;
+}
+
+bool ComponentListPush(ComponentListEntry *entry)
+{
+	mpt::lock_guard<mpt::mutex> guard(ComponentListMutex());
+#if MPT_MSVC_BEFORE(2019,0)
+	// Guard against VS2017 compiler bug causing repeated initialization of inline variables.
+	// See <https://developercommunity.visualstudio.com/t/static-inline-variable-gets-destroyed-multiple-tim/297876>.
+	if(entry->next)
+	{
+		return false;
+	}
+#endif
+	entry->next = ComponentListHead();
+	ComponentListHead() = entry;
+	return true;
+}
+
+
+static std::shared_ptr<ComponentManager> g_ComponentManager;
+
+
+void ComponentManager::Init(const IComponentManagerSettings &settings)
+{
+	MPT_LOG_GLOBAL(LogInformation, "Components", U_("Init"));
+	// cannot use make_shared because the constructor is private
+	g_ComponentManager = std::shared_ptr<ComponentManager>(new ComponentManager(settings));
+}
+
+
+void ComponentManager::Release()
+{
+	MPT_LOG_GLOBAL(LogInformation, "Components", U_("Release"));
+	g_ComponentManager = nullptr;
+}
+
+
+std::shared_ptr<ComponentManager> ComponentManager::Instance()
+{
+	return g_ComponentManager;
+}
+
+
+ComponentManager::ComponentManager(const IComponentManagerSettings &settings)
+	: m_Settings(settings)
+{
+	mpt::lock_guard<mpt::mutex> guard(ComponentListMutex());
+	for(ComponentListEntry *entry = ComponentListHead(); entry; entry = entry->next)
+	{
+		if(entry->reg)
+		{
+			entry->reg(*this);
+		}
+	}
+}
+
+
+void ComponentManager::Register(const IComponentFactory &componentFactory)
+{
+	if(m_Components.find(componentFactory.GetID()) != m_Components.end())
+	{
+		return;
+	}
+	RegisteredComponent registeredComponent;
+	registeredComponent.settingsKey = componentFactory.GetSettingsKey();
+	registeredComponent.factoryMethod = componentFactory.GetStaticConstructor();
+	registeredComponent.instance = nullptr;
+	registeredComponent.weakInstance = std::weak_ptr<IComponent>();
+	m_Components.insert(std::make_pair(componentFactory.GetID(), registeredComponent));
+}
+
+
+void ComponentManager::Startup()
+{
+	MPT_LOG_GLOBAL(LogDebug, "Components", U_("Startup"));
+	if(m_Settings.LoadOnStartup())
+	{
+		for(auto &it : m_Components)
+		{
+			it.second.instance = it.second.factoryMethod(*this);
+			it.second.weakInstance = it.second.instance;
+		}
+	}
+	if(!m_Settings.KeepLoaded())
+	{
+		for(auto &it : m_Components)
+		{
+			it.second.instance = nullptr;
+		}
+	}
+}
+
+
+bool ComponentManager::IsComponentBlocked(const std::string &settingsKey) const
+{
+	if(settingsKey.empty())
+	{
+		return false;
+	}
+	return m_Settings.IsBlocked(settingsKey);
+}
+
+
+void ComponentManager::InitializeComponent(std::shared_ptr<IComponent> component) const
+{
+	if(!component)
+	{
+		return;
+	}
+	if(component->IsInitialized())
+	{
+		return;
+	}
+	component->Initialize();
+}
+
+
+std::shared_ptr<const IComponent> ComponentManager::GetComponent(const IComponentFactory &componentFactory)
+{
+	std::shared_ptr<IComponent> component = nullptr;
+	auto it = m_Components.find(componentFactory.GetID());
+	if(it != m_Components.end())
+	{ // registered component
+		if((*it).second.instance)
+		{ // loaded
+			component = (*it).second.instance;
+		} else
+		{ // not loaded
+			component = (*it).second.weakInstance.lock();
+			if(!component)
+			{
+				component = (*it).second.factoryMethod(*this);
+			}
+			if(m_Settings.KeepLoaded())
+			{ // keep the component loaded
+				(*it).second.instance = component;
+			}
+			(*it).second.weakInstance = component;
+		}
+	} else
+	{ // unregistered component
+		component = componentFactory.Construct(*this);
+	}
+	MPT_ASSERT(component);
+	return component;
+}
+
+
+std::shared_ptr<const IComponent> ComponentManager::ReloadComponent(const IComponentFactory &componentFactory)
+{
+	std::shared_ptr<IComponent> component = nullptr;
+	auto it = m_Components.find(componentFactory.GetID());
+	if(it != m_Components.end())
+	{ // registered component
+		if((*it).second.instance)
+		{ // loaded
+			(*it).second.instance = nullptr;
+			if(!(*it).second.weakInstance.expired())
+			{
+				throw std::runtime_error("Component not completely unloaded. Cannot reload.");
+			}
+			(*it).second.weakInstance = std::weak_ptr<IComponent>();
+		}
+		// not loaded
+		component = (*it).second.factoryMethod(*this);
+		if(m_Settings.KeepLoaded())
+		{ // keep the component loaded
+			(*it).second.instance = component;
+		}
+		(*it).second.weakInstance = component;
+	} else
+	{ // unregistered component
+		component = componentFactory.Construct(*this);
+	}
+	MPT_ASSERT(component);
+	return component;
+}
+
+
+std::vector<std::string> ComponentManager::GetRegisteredComponents() const
+{
+	std::vector<std::string> result;
+	result.reserve(m_Components.size());
+	for(const auto &it : m_Components)
+	{
+		result.push_back(it.first);
+	}
+	return result;
+}
+
+
+ComponentInfo ComponentManager::GetComponentInfo(std::string name) const
+{
+	ComponentInfo result;
+	result.name = name;
+	result.state = ComponentStateUnregistered;
+	result.settingsKey = "";
+	result.type = ComponentTypeUnknown;
+	const auto it = m_Components.find(name);
+	if(it == m_Components.end())
+	{
+		result.state = ComponentStateUnregistered;
+		return result;
+	}
+	result.settingsKey = it->second.settingsKey;
+	if(IsComponentBlocked(it->second.settingsKey))
+	{
+		result.state = ComponentStateBlocked;
+		return result;
+	}
+	std::shared_ptr<IComponent> component = it->second.instance;
+	if(!component)
+	{
+		component = it->second.weakInstance.lock();
+	}
+	if(!component)
+	{
+		result.state = ComponentStateUnintialized;
+		return result;
+	}
+	result.type = component->GetType();
+	if(!component->IsInitialized())
+	{
+		result.state = ComponentStateUnintialized;
+		return result;
+	}
+	if(!component->IsAvailable())
+	{
+		result.state = ComponentStateUnavailable;
+		return result;
+	}
+	result.state = ComponentStateAvailable;
+	return result;
+}
+
+
+mpt::PathString ComponentManager::GetComponentPath() const
+{
+	return m_Settings.Path();
+}
+
+
+#endif // MPT_COMPONENT_MANAGER
+
+
+OPENMPT_NAMESPACE_END