// FIXME: to be further simplified when we centralize tile messages.
int TileCache::isTileBeingRenderedIfSoSubscribe(const TileDesc& tile, const std::shared_ptr<ClientSession> &subscriber)
{
std::unique_lock<std::mutex> lock(_tilesBeingRenderedMutex);
std::shared_ptr<TileBeingRendered> tileBeingRendered = findTileBeingRendered(tile);
if (tileBeingRendered)
{
Log::debug() << "Tile (" << tile.getPart() << ',' << tile.getTilePosX() << ','
<< tile.getTilePosY() << ") is already being rendered, subscribing." << Log::end;
assert(subscriber->getKind() == LOOLSession::Kind::ToClient);
for (const auto &s : tileBeingRendered->_subscribers)
{
if (s.lock().get() == subscriber.get())
{
Log::debug("Redundant request to re-subscribe on a tile");
return 0;
}
}
tileBeingRendered->_subscribers.push_back(subscriber);
const auto duration = (std::chrono::steady_clock::now() - tileBeingRendered->getStartTime());
if (std::chrono::duration_cast<std::chrono::milliseconds>(duration).count() > COMMAND_TIMEOUT_MS)
{
// Tile painting has stalled. Reissue.
return tileBeingRendered->getVersion();
}
return 0;
}
else
{
Log::debug() << "Tile (" << tile.getPart() << ',' << tile.getTilePosX() << ','
<< tile.getTilePosY() << ") needs rendering, subscribing for ver: "
<< tile.getVersion() << "." << Log::end;
const std::string cachedName = cacheFileName(tile);
assert(_tilesBeingRendered.find(cachedName) == _tilesBeingRendered.end());
tileBeingRendered = std::make_shared<TileBeingRendered>(cachedName, tile.getVersion());
tileBeingRendered->_subscribers.push_back(subscriber);
_tilesBeingRendered[cachedName] = tileBeingRendered;
return tileBeingRendered->getVersion();
}
}
std::string TileCache::cacheFileName(const TileDesc& tile)
{
std::ostringstream oss;
oss << tile.getPart() << '_' << tile.getWidth() << 'x' << tile.getHeight() << '.'
<< tile.getTilePosX() << ',' << tile.getTilePosY() << '.'
<< tile.getTileWidth() << 'x' << tile.getTileHeight() << ".png";
return oss.str();
}
std::unique_ptr<std::fstream> TileCache::lookupTile(const TileDesc& tile)
{
const std::string fileName = _cacheDir + "/" + cacheFileName(tile);
std::unique_ptr<std::fstream> result(new std::fstream(fileName, std::ios::in));
UnitWSD::get().lookupTile(tile.getPart(), tile.getWidth(), tile.getHeight(),
tile.getTilePosX(), tile.getTilePosY(),
tile.getTileWidth(), tile.getTileHeight(), result);
if (result && result->is_open())
{
Log::trace("Found cache tile: " + fileName);
return result;
}
return nullptr;
}