Method Open

view/sharedcache/core/FileAccessorCache.cpp:35–69

}

WeakFileAccessor FileAccessorCache::Open(const std::string& filePath)
{
	const auto id = GetCacheAccessorID(filePath);
	std::unique_lock lock(m_mutex);

	// Check if the file is already in the cache.
	if (const auto it = m_accessors.find(id); it != m_accessors.end())
	{
		// Move the accessed ID to the back so we keep it in the cache.
		auto pos = std::find(m_cache.begin(), m_cache.end(), id);
		if (pos != m_cache.end())
			m_cache.erase(pos);
		m_cache.push_back(id);

		return WeakFileAccessor(it->second, filePath);
	}

	// Evict if we are going to go above the limit.
	while (m_cache.size() >= m_cacheSize)
		EvictLastUsed();

	// Create a new file accessor and add it to the cache.
	auto accessor = MappedFileAccessor::Open(filePath);
	if (accessor == nullptr)
	{
		// We failed to open the file, we must throw hard!
		// TODO: Make this mechanism more thought out...
		throw std::runtime_error("Failed to open file: " + filePath);
	}
	auto sharedAccessor = std::make_shared<MappedFileAccessor>(std::move(*accessor));
	m_accessors.insert_or_assign(id, sharedAccessor);
	m_cache.push_back(id);

	return WeakFileAccessor(sharedAccessor, filePath);
}

void FileAccessorCache::RemoveAccessor(const CacheAccessorID id)
{