Initial commit

src/common/subsystems.cpp

@@ -0,0 +1,232 @@
+#include "common/subsystems.h"
+
+#include "common/assert.h"
+
+#include <cstdarg>
+#include <cstdio>
+#include <cstring>
+#include <memory>
+#include <string>
+
+namespace Common {
+
+class SubsystemPrivate {
+public:
+	SubsystemPrivate()          = default;
+	virtual ~SubsystemPrivate() = default;
+
+	KYTY_CLASS_NO_COPY(SubsystemPrivate);
+
+	bool        failed {false};
+	std::string fail_msg;
+};
+
+class SubsystemsListPrivate {
+public:
+	explicit SubsystemsListPrivate(SubsystemsList& p): parent(p) {}
+
+	virtual ~SubsystemsListPrivate() = default;
+
+	void SetArgs(int argc, char** argv) {
+		this->m_argc = argc;
+		this->m_argv = argv;
+	}
+
+	void Add(Subsystem* s, std::initializer_list<Subsystem*> deps) {
+		EXIT_IF(!s);
+
+		const char* name = s->Id();
+
+		EXIT_IF(FindByName(name) != nullptr);
+
+		auto nl = std::make_unique<SubsListStruct>();
+
+		nl->s         = s;
+		nl->name      = name;
+		nl->deps      = nullptr;
+		nl->next      = std::move(list);
+		nl->prev_init = nullptr;
+
+		auto* node = nl.get();
+		list       = std::move(nl);
+
+		for (auto* dep: deps) {
+			const char* str = dep->Id();
+
+			auto l      = std::make_unique<DepsListStruct>();
+			l->dep_name = str;
+			l->next     = std::move(node->deps);
+
+			node->deps = std::move(l);
+		}
+
+		node->initialized = false;
+	}
+
+	bool InitAll(bool print_msg) {
+		while (SubsListStruct* n = FindNextToInitialize()) {
+			n->s->Init(&parent);
+
+			if (n->s->m_p->failed) {
+				fail_msg  = n->s->m_p->fail_msg.c_str();
+				fail_name = n->name;
+				return false;
+			}
+
+			if (print_msg) {
+				printf("Initialized: %s\n", n->name);
+			}
+
+			n->initialized = true;
+
+			SubsListStruct* last = last_init;
+			last_init            = n;
+			n->prev_init         = last;
+		}
+
+		return true;
+	}
+
+	void DestroyAll(bool print_msg) {
+		for (SubsListStruct* n = last_init; n != nullptr; n = n->prev_init) {
+			n->s->Destroy(&parent);
+			n->initialized = false;
+
+			if (print_msg) {
+				printf("Destroyed: %s\n", n->name);
+			}
+		}
+
+		last_init = nullptr;
+	}
+
+	void ShutdownAll() {
+		for (SubsListStruct* n = last_init; n != nullptr; n = n->prev_init) {
+			n->s->UnexpectedShutdown(&parent);
+			n->initialized = false;
+		}
+
+		last_init = nullptr;
+	}
+
+	struct DepsListStruct {
+		const char*                     dep_name;
+		std::unique_ptr<DepsListStruct> next;
+	};
+
+	struct SubsListStruct {
+		Subsystem*                      s;
+		const char*                     name;
+		std::unique_ptr<DepsListStruct> deps;
+		std::unique_ptr<SubsListStruct> next;
+		SubsListStruct*                 prev_init;
+		bool                            initialized;
+	};
+
+	[[nodiscard]] SubsListStruct* FindByName(const char* name) const {
+		for (SubsListStruct* n = list.get(); n != nullptr; n = n->next.get()) {
+			if (std::strcmp(n->name, name) == 0) {
+				return n;
+			}
+		}
+
+		return nullptr;
+	}
+
+	[[nodiscard]] SubsListStruct* FindNextToInitialize() const {
+		for (SubsListStruct* n = list.get(); n != nullptr; n = n->next.get()) {
+			if (n->initialized) {
+				continue;
+			}
+
+			DepsListStruct* d = n->deps.get();
+			for (; d != nullptr; d = d->next.get()) {
+				SubsListStruct* s = FindByName(d->dep_name);
+				if ((s == nullptr) || !s->initialized) {
+					break;
+				}
+			}
+
+			if (d == nullptr) {
+				return n;
+			}
+		}
+
+		return nullptr;
+	}
+
+	KYTY_CLASS_NO_COPY(SubsystemsListPrivate);
+
+	std::unique_ptr<SubsListStruct> list;
+	SubsListStruct*                 last_init = nullptr;
+	int                             m_argc    = 0;
+	char**                          m_argv    = nullptr;
+	const char*                     fail_msg  = nullptr;
+	const char*                     fail_name = nullptr;
+	SubsystemsList&                 parent;
+};
+
+SubsystemsList::SubsystemsList(): m_p(std::make_unique<SubsystemsListPrivate>(*this)) {}
+
+SubsystemsList::~SubsystemsList() = default;
+
+void SubsystemsList::Add(Subsystem* s, std::initializer_list<Subsystem*> deps) {
+	m_p->Add(s, deps);
+}
+
+bool SubsystemsList::InitAll(bool print_msg) {
+	return m_p->InitAll(print_msg);
+}
+
+void SubsystemsList::DestroyAll(bool print_msg) {
+	m_p->DestroyAll(print_msg);
+}
+
+int* SubsystemsList::GetArgc() {
+	return &m_p->m_argc;
+}
+
+char** SubsystemsList::GetArgv() {
+	return m_p->m_argv;
+}
+
+Subsystem::Subsystem(): m_p(std::make_unique<SubsystemPrivate>()) {}
+
+Subsystem::~Subsystem() = default;
+
+void Subsystem::Fail(const char* format, ...) {
+	va_list args {};
+	va_start(args, format);
+
+	va_list args_copy {};
+	va_copy(args_copy, args);
+	int len = std::vsnprintf(nullptr, 0, format, args_copy);
+	va_end(args_copy);
+
+	if (len > 0) {
+		std::string msg(static_cast<size_t>(len) + 1, '\0');
+		std::vsnprintf(msg.data(), msg.size(), format, args);
+		m_p->fail_msg = msg.c_str();
+		m_p->failed   = true;
+	}
+
+	va_end(args);
+}
+
+const char* SubsystemsList::GetFailName() const {
+	return m_p->fail_name;
+}
+
+const char* SubsystemsList::GetFailMsg() const {
+	return m_p->fail_msg;
+}
+
+void SubsystemsList::SetArgs(int argc, char* argv[]) {
+	m_p->SetArgs(argc, argv);
+}
+
+void SubsystemsList::ShutdownAll() {
+	m_p->ShutdownAll();
+}
+
+} // namespace Common