feat: implement module lifecycle

src/engine/core/engine.cpp

@@ -1,12 +1,16 @@
+#include "engine/core/engine_module_api.hpp"
+#include <chrono>
 #include <cstdint>
 #include <engine/core/engine.hpp>
+#include <functional>
 #include <memory>
 #include <stdexcept>
 #include <string>
+#include <thread>
 #include <unordered_map>
 #include <vector>
 
-uint16_t MscEngine::REV = 0;
+std::uint16_t MscEngine::REV = 1;
 
 MscEngine::MscEngine(std::vector<std::shared_ptr<MscEngineModule>> modules)
 {
@@ -64,13 +68,42 @@ void MscEngine::start()
   _isRunning = true;
   _lastUpdate = clock::now();
 
-  double accumulator = 0.0;
-  constexpr double fixedDt = 1.0 / 30.0;
+  for (auto &m : _modules)
+    m->onStart(*this);
+
+  constexpr auto tickDuration = std::chrono::milliseconds(50);
+  auto nextTick = clock::now();
+
+  using UpdateFn = std::function<void(IMscEngineModuleAPI & engine,
+                                      IMscEngineModuleAPI::clock::duration dt)>;
+  std::vector<UpdateFn> updateFns;
+  updateFns.reserve(_modules.size());
+
+  for (auto &m : _modules)
+    updateFns.emplace_back([m](IMscEngineModuleAPI &engine,
+                               IMscEngineModuleAPI::clock::duration dt)
+                           { m->onUpdate(engine, dt); });
 
   while (_isRunning)
   {
-    //
+    nextTick += tickDuration;
+    const auto currentTick = clock::now();
+    const auto dt = currentTick - _lastUpdate;
+
+    // TODO: process
+
+    for (auto upd : updateFns)
+      upd(*this, dt);
+
+    _lastUpdate = currentTick;
+
+    std::this_thread::sleep_until(nextTick);
+    if (clock::now() > nextTick + std::chrono::seconds(1))
+      nextTick = clock::now();
   }
+
+  for (auto &m : _modules)
+    m->onStop(*this);
 }
 
 void MscEngine::stop()
@@ -81,12 +114,10 @@ void MscEngine::stop()
   _isRunning = false;
 }
 
-MscEventBus &MscEngine::getBus()
-{
-  return _bus;
-}
+MscEventBus &MscEngine::getBus() { return _bus; }
 
-std::unordered_map<std::string, std::uint16_t> MscEngine::getLoadedModules() const
+std::unordered_map<std::string, std::uint16_t>
+MscEngine::getLoadedModules() const
 {
   std::unordered_map<std::string, std::uint16_t> result;
   for (const auto &module : _modules)
@@ -117,7 +148,8 @@ std::unique_ptr<MscEngineDBProvider> MscEngine::createDBProvider()
   return std::make_unique<MscEngineDBProvider>();
 }
 
-std::unique_ptr<MscEngineDBProvider> MscEngine::createDBProvider(const std::string &filepath)
+std::unique_ptr<MscEngineDBProvider>
+MscEngine::createDBProvider(const std::string &filepath)
 {
   return std::make_unique<MscEngineDBProvider>(filepath);
 }