void GenericHandler<Request, Model, IdPolicy>
::load_collection(JsonAgentSPtr agent, const std::string &parent,
const CollectionType& collection_type, bool recursively) {
Context ctx;
ctx.agent = agent.get();
ctx.mode = Context::Mode::LOADING;
auto indent = ctx.indent;
ctx.indent += " ";
log_info(GET_LOGGER("rest"), ctx.indent << "[" << static_cast<char>(ctx.mode) << "] "
<< "Loading collections of type [" << collection_type.to_string() << "] for ["
<< component_s() << " " << parent << " " << "]");
Request request{parent};
const Model entry = ctx.agent->execute<Model>(request);
std::vector<Collection> collections{};
std::for_each(entry.get_collections().get_array().begin(), entry.get_collections().get_array().end(),
[&collection_type, &collections] (const Collection& element) {
if (element.get_type() == collection_type) {
collections.push_back(element);
}
}
);
if (collections.empty()) {
log_error(GET_LOGGER("rest"), ctx.indent << "[" << static_cast<char>(ctx.mode) << "] "
<< "No collection of type \'" << collection_type
<< "\' for [" << component_s() << " " << parent << "]");
}
if (recursively) {
fetch_subcomponents(ctx, parent, collections);
}
else {
// same as in fetch_siblings, this method maps component types (aka collection types)
// to the epoch from before loading in order to know what we should remove
std::map<CollectionType, uint64_t> epochs{};
for (const auto& collection : collections) {
log_info(GET_LOGGER("rest"), ctx.indent << "[" << static_cast<char>(ctx.mode)
<< "] Collection [" << collection.get_name() << "]");
auto handler = HandlerManager::get_instance()->get_handler(collection.get_type());
if (epochs.find(collection.get_type()) == epochs.end()) {
epochs[collection.get_type()] = handler->get_manager_epoch();
}
const auto siblings = handler->fetch_sibling_uuid_list(ctx, parent, collection.get_name());
for (const auto& sibling: siblings) {
handler->update(ctx, parent, sibling.get_subcomponent());
}
}
// removing the components we did not touch
for (const auto& collection_epoch : epochs) {
HandlerManager::get_instance()->get_handler(collection_epoch.first)
->remove_untouched(ctx, parent, collection_epoch.second);
}
}
ctx.indent = indent;
SubscriptionManager::get_instance()->notify(ctx.events);
}
