start with messages (no fragments get created yet)

src/fragment_store/message_fragment_store.cpp

@@ -0,0 +1,131 @@
+#include "./message_fragment_store.hpp"
+
+#include <solanaceae/message3/components.hpp>
+
+#include <nlohmann/json.hpp>
+
+#include <cstdint>
+#include <cassert>
+
+static bool serl_json_msg_ts_range(void* comp, nlohmann::json& out) {
+	if (comp == nullptr) {
+		return false;
+	}
+
+	out = nlohmann::json::object();
+
+	auto& r_comp = *reinterpret_cast<FragComp::MessagesTSRange*>(comp);
+
+	out["begin"] = r_comp.begin;
+	out["end"] = r_comp.end;
+
+	return true;
+}
+
+void MessageFragmentStore::handleMessage(const Message3Handle& m) {
+	if (!static_cast<bool>(m)) {
+		return; // huh?
+	}
+
+	if (!m.all_of<Message::Components::Timestamp>()) {
+		return; // we only handle msg with ts
+	}
+
+	const auto msg_ts = m.get<Message::Components::Timestamp>().ts;
+
+	if (!m.all_of<Message::Components::FUID>()) {
+		// missing fuid
+		// find closesed non-sealed off fragment
+
+		std::vector<uint8_t> fragment_uid;
+
+		// first search for fragment where the ts falls into the range
+		for (const auto& [tsrage, fid] : _fuid_open) {
+			if (tsrage.ts_begin <= msg_ts && tsrage.ts_end >= msg_ts) {
+				fragment_uid = fid;
+				// TODO: check conditions for open here
+				// TODO: mark msg (and frag?) dirty
+			}
+		}
+
+		// if it did not fit into an existing fragment, we next look for fragments that could be extended
+		if (fragment_uid.empty()) {
+			for (const auto& [tsrage, fid] : _fuid_open) {
+				const int64_t frag_range = int64_t(tsrage.ts_end) - int64_t(tsrage.ts_begin);
+				//constexpr static int64_t max_frag_ts_extent {1000*60*60};
+				constexpr static int64_t max_frag_ts_extent {1000*60*3}; // 3min for testing
+				const int64_t possible_extention = max_frag_ts_extent - frag_range;
+
+				// which direction
+				if ((tsrage.ts_begin - possible_extention) <= msg_ts) {
+					fragment_uid = fid;
+					auto fh = _fs.fragmentHandle(_fs.getFragmentByID(fid));
+					assert(static_cast<bool>(fh));
+
+					// assuming ts range exists
+					auto& fts_comp = fh.get<FragComp::MessagesTSRange>();
+					fts_comp.begin = msg_ts; // extend into the past
+
+					// TODO: check conditions for open here
+					// TODO: mark msg (and frag?) dirty
+				} else if ((tsrage.ts_end + possible_extention) >= msg_ts) {
+					fragment_uid = fid;
+					auto fh = _fs.fragmentHandle(_fs.getFragmentByID(fid));
+					assert(static_cast<bool>(fh));
+
+					// assuming ts range exists
+					auto& fts_comp = fh.get<FragComp::MessagesTSRange>();
+					fts_comp.end = msg_ts; // extend into the future
+
+					// TODO: check conditions for open here
+					// TODO: mark msg (and frag?) dirty
+				}
+			}
+		}
+
+		// if its still not found, we need a new fragment
+		if (fragment_uid.empty()) {
+		}
+
+		// if this is still empty, something is very wrong and we exit here
+		if (fragment_uid.empty()) {
+			return;
+		}
+
+		m.emplace<Message::Components::FUID>(fragment_uid);
+	}
+
+	// TODO: do we use fid?
+
+	// on new message: assign fuid
+	// on new and update: mark as fragment dirty
+}
+
+MessageFragmentStore::MessageFragmentStore(
+	RegistryMessageModel& rmm,
+	FragmentStore& fs
+) : _rmm(rmm), _fs(fs) {
+	_rmm.subscribe(this, RegistryMessageModel_Event::message_construct);
+	_rmm.subscribe(this, RegistryMessageModel_Event::message_updated);
+	_rmm.subscribe(this, RegistryMessageModel_Event::message_destroy);
+
+	_fs._sc.registerSerializerJson<FragComp::MessagesTSRange>(serl_json_msg_ts_range);
+}
+
+MessageFragmentStore::~MessageFragmentStore(void) {
+}
+
+float MessageFragmentStore::tick(float time_delta) {
+	return 1000.f*60.f*60.f;
+}
+
+bool MessageFragmentStore::onEvent(const Message::Events::MessageConstruct& e) {
+	handleMessage(e.e);
+	return false;
+}
+
+bool MessageFragmentStore::onEvent(const Message::Events::MessageUpdated& e) {
+	handleMessage(e.e);
+	return false;
+}
+