Method get

src/core/impl/utils/persistent_cache.cpp:120–139

// ================= InMemoryPersistentCache ==================
using Blob = PersistentCache::Blob;
Maybe<Blob> InMemoryPersistentCache::get(const std::string& category, const Blob& key) {
    decltype(m_cache.begin()) iter0;
    {
        MGB_LOCK_GUARD(m_mtx);
        iter0 = m_cache.find(category);
        if (iter0 == m_cache.end())
            return None;
    }

    BlobStorage key_storage;
    key_storage.Blob::operator=(key);
    key_storage.init_hash();

    MGB_LOCK_GUARD(m_mtx);

    auto iter1 = iter0->second.find(key_storage);
    if (iter1 == iter0->second.end())
        return None;
    return iter1->second;
}

void InMemoryPersistentCache::put(
        const std::string& category, const Blob& key, const Blob& value) {