void TileCache::saveTileAndNotify(const TileDesc& tile, const char *data, const size_t size, const bool priority)
{
std::unique_lock<std::mutex> lock(_tilesBeingRenderedMutex);
std::shared_ptr<TileBeingRendered> tileBeingRendered = findTileBeingRendered(tile);
if (!priority && tileBeingRendered && tileBeingRendered->getVersion() != tile.getVersion())
{
Log::trace() << "Skipping unexpected tile ver: " << tile.getVersion()
<< ", waiting for ver " << tileBeingRendered->getVersion() << Log::end;
return;
}
// Save to disk.
const auto cachedName = (tileBeingRendered ? tileBeingRendered->getCacheName()
: cacheFileName(tile));
const auto fileName = _cacheDir + "/" + cachedName;
Log::trace() << "Saving cache tile: " << fileName << Log::end;
std::fstream outStream(fileName, std::ios::out);
outStream.write(data, size);
outStream.close();
// Notify subscribers, if any.
if (tileBeingRendered)
{
if (!tileBeingRendered->_subscribers.empty())
{
const std::string message = tile.serialize("tile");
Log::debug("Sending tile message to subscribers: " + message);
for (const auto& i: tileBeingRendered->_subscribers)
{
auto subscriber = i.lock();
if (subscriber)
{
//FIXME: This is inefficient; should just send directly to each client (although that is risky as well!
// Re-emit the tile command in the other thread(s) to re-check and hit
// the cache. Construct the message from scratch to contain only the
// mandatory parts of the message.
subscriber->sendToInputQueue(message);
}
}
}
// Remove subscriptions.
if (tileBeingRendered->getVersion() == tile.getVersion())
{
Log::debug() << "STATISTICS: tile internal roundtrip "
<< tileBeingRendered->getElapsedTimeMs() << " ms." << Log::end;
_tilesBeingRendered.erase(cachedName);
}
}
}
// 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();
}
}