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#include <mbgl/style/sources/custom_vector_source.hpp>
#include <mbgl/style/sources/custom_vector_source_impl.hpp>
#include <mbgl/actor/scheduler.hpp>
#include <mbgl/tile/tile_id.hpp>
#include <tuple>
#include <map>
namespace mbgl {
namespace style {
class CustomTileLoader::Impl {
public:
using OverscaledIDFunctionTuple = std::tuple<uint8_t, int16_t, ActorRef<SetTileDataFunction>>;
Impl(TileFunction&& fetchTileFn, TileFunction&& cancelTileFn) {
fetchTileFunction = std::move(fetchTileFn);
cancelTileFunction = std::move(cancelTileFn);
}
void fetchTile(const OverscaledTileID& tileID, ActorRef<SetTileDataFunction> callbackRef) {
auto cachedTileData = dataCache.find(tileID.canonical);
if (cachedTileData == dataCache.end()) {
fetchTileFunction(tileID.canonical);
} else {
callbackRef.invoke(&SetTileDataFunction::operator(), *(cachedTileData->second));
}
auto tileCallbacks = tileCallbackMap.find(tileID.canonical);
if (tileCallbacks == tileCallbackMap.end()) {
auto tuple = std::make_tuple(tileID.overscaledZ, tileID.wrap, callbackRef);
tileCallbackMap.insert({ tileID.canonical, std::vector<OverscaledIDFunctionTuple>(1, tuple) });
}
else {
for(auto iter = tileCallbacks->second.begin(); iter != tileCallbacks->second.end(); iter++) {
if(std::get<0>(*iter) == tileID.overscaledZ && std::get<1>(*iter) == tileID.wrap ) {
std::get<2>(*iter) = callbackRef;
return;
}
}
tileCallbacks->second.emplace_back(std::make_tuple(tileID.overscaledZ, tileID.wrap, callbackRef));
}
}
void cancelTile(const OverscaledTileID& tileID) {
if(tileCallbackMap.find(tileID.canonical) != tileCallbackMap.end()) {
cancelTileFunction(tileID.canonical);
}
}
void removeTile(const OverscaledTileID& tileID) {
auto tileCallbacks = tileCallbackMap.find(tileID.canonical);
if (tileCallbacks == tileCallbackMap.end()) return;
for(auto iter = tileCallbacks->second.begin(); iter != tileCallbacks->second.end(); iter++) {
if(std::get<0>(*iter) == tileID.overscaledZ && std::get<1>(*iter) == tileID.wrap ) {
tileCallbacks->second.erase(iter);
break;
}
}
if (tileCallbacks->second.size() == 0) {
tileCallbackMap.erase(tileCallbacks);
dataCache.erase(tileID.canonical);
}
}
void setTileData(const CanonicalTileID& tileID, const mapbox::geojson::geojson& data) {
auto iter = tileCallbackMap.find(tileID);
if (iter == tileCallbackMap.end()) return;
dataCache[tileID] = std::make_unique<mapbox::geojson::geojson>(std::move(data));
for(auto tuple : iter->second) {
auto actor = std::get<2>(tuple);
actor.invoke(&SetTileDataFunction::operator(), data);
}
}
private:
TileFunction fetchTileFunction;
TileFunction cancelTileFunction;
std::unordered_map<CanonicalTileID, std::vector<OverscaledIDFunctionTuple>> tileCallbackMap;
std::map<CanonicalTileID, std::unique_ptr<mapbox::geojson::geojson>> dataCache;
};
CustomTileLoader::CustomTileLoader(TileFunction fetchTileFn, TileFunction cancelTileFn)
: impl(new CustomTileLoader::Impl(std::move(fetchTileFn), std::move(cancelTileFn))) {
}
CustomTileLoader::~CustomTileLoader() {
delete impl;
impl = nullptr;
}
void CustomTileLoader::fetchTile(const OverscaledTileID& tileID, ActorRef<SetTileDataFunction> callbackRef) {
impl->fetchTile(tileID, callbackRef);
}
void CustomTileLoader::cancelTile(const OverscaledTileID& tileID) {
impl->cancelTile(tileID);
}
void CustomTileLoader::setTileData(const CanonicalTileID& tileID, const mapbox::geojson::geojson& data) {
impl->setTileData(tileID, data);
}
void CustomTileLoader::removeTile(const OverscaledTileID& tileID) {
impl->removeTile(tileID);
}
CustomVectorSource::CustomVectorSource(std::string id,
const CustomVectorSource::Options options)
: Source(makeMutable<CustomVectorSource::Impl>(std::move(id), options)),
mailbox(std::make_shared<Mailbox>(*Scheduler::GetCurrent())),
loader(options.fetchTileFunction, options.cancelTileFunction) {
}
const CustomVectorSource::Impl& CustomVectorSource::impl() const {
return static_cast<const CustomVectorSource::Impl&>(*baseImpl);
}
void CustomVectorSource::loadDescription(FileSource&) {
baseImpl = makeMutable<CustomVectorSource::Impl>(impl(), ActorRef<CustomTileLoader>(loader, mailbox));
loaded = true;
}
void CustomVectorSource::setTileData(const CanonicalTileID& tileID,
const mapbox::geojson::geojson& data) {
loader.setTileData(tileID, data);
}
} // namespace style
} // namespace mbgl
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