Method initCacheFromFileSystem

src/Storages/DiskCache/KeyIndexFileCache.cpp:147–179

KeyIndexFileCache::~KeyIndexFileCache() = default;

void KeyIndexFileCache::initCacheFromFileSystem()
{
    LOG_INFO(log, "Initializing KeyIndexFileCache...");
    Poco::File(rep->base_path).createDirectories();

    Stopwatch timer;
    int num_loaded = 0;
    Poco::DirectoryIterator end;
    for (auto it = Poco::DirectoryIterator(rep->base_path); it != end; ++it)
    {
        auto & filename = it.name();
        if (startsWith(filename, "TMP_"))
        {
            LOG_TRACE(log, "Removing temporary file {}", it->path());
            Poco::File(it->path()).remove();
        }
        else
        {
            String key;
            UInt64 size;
            if (tryParseCacheFileName(filename, key, size))
            {
                rep->cache.set(key, CacheValue::Cached(size));
                num_loaded++;
            }
            else
            {
                LOG_WARNING(log, "Unrecognized name for unique key index cache file: {}", filename);
            }
        }
    }
    LOG_INFO(log, "Initialized KeyIndexFileCache with {} entries in {} ms", num_loaded, timer.elapsedMilliseconds());
}

int KeyIndexFileCache::get(const IndexFile::RemoteFileInfo & file)
{