protot/src/RuntimeModuleManager.cc

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#include "RuntimeModuleManager.h"
#define _BSD_SOURCE // usleep()
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <dlfcn.h>
#include "RuntimeModule.h"
#include <iostream>
struct RuntimeModule {
std::string name ="";
void *handle = nullptr;
ino_t id = 0;
void *data = nullptr;
struct module_api api;
struct module_state *state = nullptr;
};
void RuntimeModuleManager::RegisterModule(const char* name) {
RuntimeModule* module = new RuntimeModule();
module->name = name;
mModules.push_back(module);
}
void RuntimeModuleManager::LoadModule(RuntimeModule* module) {
struct stat attr;
if ((stat(module->name.c_str(), &attr) == 0) && (module->id != attr.st_ino)) {
std::cerr << "Detected update of module " << module->name << std::endl;
if (module->handle) {
std::cerr << "Unloading module " << module->name << std::endl;
module->api.unload(module->state);
dlclose(module->handle);
}
std::cerr << "Opening module " << module->name << std::endl;
void *handle = dlopen(module->name.c_str(), RTLD_NOW);
if (handle) {
module->handle = handle;
module->id = attr.st_ino;
std::cerr << "Loading API symbol" << std::endl;
const struct module_api *api = (module_api*) dlsym(module->handle, "MODULE_API");
if (api != NULL) {
module->api = *api;
if (module->state == NULL) {
std::cerr << "Initializing module" << std::endl;
module->state = module->api.init();
}
std::cerr << "Reloading module" << std::endl;
module->api.reload(module->state);
} else {
dlclose(module->handle);
module->handle = NULL;
module->id = 0;
}
} else {
module->handle = NULL;
module->id = 0;
}
}
}
void RuntimeModuleManager::Update(float dt) {
for (int i = 0; i < mModules.size(); i++) {
LoadModule(mModules[i]);
if (mModules[i]->handle) {
mModules[i]->api.step(mModules[i]->state);
}
}
}
void RuntimeModuleManager::UnloadModules() {
for (int i = 0; i < mModules.size(); i++) {
if (mModules[i]->handle) {
mModules[i]->api.finalize(mModules[i]->state);
mModules[i]->state = nullptr;
dlclose(mModules[i]->handle);
mModules[i]->handle = 0;
mModules[i]->id = 0;
delete mModules[i];
}
}
}