mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-12-12 01:12:12 +00:00
844 lines
31 KiB
C++
844 lines
31 KiB
C++
#pragma once
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#include <chrono>
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#include <variant>
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#include <pcg_random.hpp>
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#include <Common/randomSeed.h>
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#include <Common/Arena.h>
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#include <Common/ArenaWithFreeLists.h>
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#include <Common/ArenaUtils.h>
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#include <Common/HashTable/LRUHashMap.h>
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#include <Dictionaries/DictionaryStructure.h>
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#include <Dictionaries/ICacheDictionaryStorage.h>
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namespace DB
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{
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namespace ErrorCodes
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{
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extern const int NOT_IMPLEMENTED;
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}
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struct CacheDictionaryStorageConfiguration
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{
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/// Max size of storage in cells
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const size_t max_size_in_cells;
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/// Needed to perform check if cell is expired or not found. Default value is dictionary max lifetime.
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const size_t strict_max_lifetime_seconds;
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/// Lifetime of dictionary. Cell deadline is random value between lifetime min and max seconds.
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const DictionaryLifetime lifetime;
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};
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/** ICacheDictionaryStorage implementation that keeps key in hash table with fixed collision length.
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* Value in hash table point to index in attributes arrays.
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*/
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template <DictionaryKeyType dictionary_key_type>
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class CacheDictionaryStorage final : public ICacheDictionaryStorage
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{
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static constexpr size_t max_collision_length = 10;
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public:
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using KeyType = std::conditional_t<dictionary_key_type == DictionaryKeyType::Simple, UInt64, StringRef>;
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explicit CacheDictionaryStorage(
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const DictionaryStructure & dictionary_structure,
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CacheDictionaryStorageConfiguration & configuration_)
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: configuration(configuration_)
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, rnd_engine(randomSeed())
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{
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size_t cells_size = roundUpToPowerOfTwoOrZero(std::max(configuration.max_size_in_cells, max_collision_length));
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cells.resize_fill(cells_size);
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size_overlap_mask = cells_size - 1;
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createAttributes(dictionary_structure);
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}
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bool returnsFetchedColumnsInOrderOfRequestedKeys() const override { return true; }
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String getName() const override
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{
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if (dictionary_key_type == DictionaryKeyType::Simple)
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return "Cache";
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else
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return "ComplexKeyCache";
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}
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bool supportsSimpleKeys() const override { return dictionary_key_type == DictionaryKeyType::Simple; }
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SimpleKeysStorageFetchResult fetchColumnsForKeys(
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const PaddedPODArray<UInt64> & keys,
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const DictionaryStorageFetchRequest & fetch_request,
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IColumn::Filter * const default_mask) override
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{
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if constexpr (dictionary_key_type == DictionaryKeyType::Simple)
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return fetchColumnsForKeysImpl<SimpleKeysStorageFetchResult>(keys, fetch_request, default_mask);
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else
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throw Exception(ErrorCodes::NOT_IMPLEMENTED, "Method fetchColumnsForKeys is not supported for complex key storage");
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}
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void insertColumnsForKeys(const PaddedPODArray<UInt64> & keys, Columns columns) override
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{
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if constexpr (dictionary_key_type == DictionaryKeyType::Simple)
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insertColumnsForKeysImpl(keys, columns);
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else
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throw Exception(ErrorCodes::NOT_IMPLEMENTED, "Method insertColumnsForKeys is not supported for complex key storage");
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}
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void insertDefaultKeys(const PaddedPODArray<UInt64> & keys) override
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{
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if constexpr (dictionary_key_type == DictionaryKeyType::Simple)
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insertDefaultKeysImpl(keys);
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else
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throw Exception(ErrorCodes::NOT_IMPLEMENTED, "Method insertDefaultKeysImpl is not supported for complex key storage");
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}
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PaddedPODArray<UInt64> getCachedSimpleKeys() const override
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{
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if constexpr (dictionary_key_type == DictionaryKeyType::Simple)
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return getCachedKeysImpl();
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else
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throw Exception(ErrorCodes::NOT_IMPLEMENTED, "Method getCachedSimpleKeys is not supported for complex key storage");
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}
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bool supportsComplexKeys() const override { return dictionary_key_type == DictionaryKeyType::Complex; }
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ComplexKeysStorageFetchResult fetchColumnsForKeys(
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const PaddedPODArray<StringRef> & keys,
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const DictionaryStorageFetchRequest & column_fetch_requests,
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IColumn::Filter * const default_mask) override
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{
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if constexpr (dictionary_key_type == DictionaryKeyType::Complex)
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return fetchColumnsForKeysImpl<ComplexKeysStorageFetchResult>(keys, column_fetch_requests, default_mask);
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else
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throw Exception(ErrorCodes::NOT_IMPLEMENTED, "Method fetchColumnsForKeys is not supported for simple key storage");
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}
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void insertColumnsForKeys(const PaddedPODArray<StringRef> & keys, Columns columns) override
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{
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if constexpr (dictionary_key_type == DictionaryKeyType::Complex)
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insertColumnsForKeysImpl(keys, columns);
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else
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throw Exception(ErrorCodes::NOT_IMPLEMENTED, "Method insertColumnsForKeys is not supported for simple key storage");
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}
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void insertDefaultKeys(const PaddedPODArray<StringRef> & keys) override
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{
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if constexpr (dictionary_key_type == DictionaryKeyType::Complex)
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insertDefaultKeysImpl(keys);
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else
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throw Exception(ErrorCodes::NOT_IMPLEMENTED, "Method insertDefaultKeysImpl is not supported for simple key storage");
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}
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PaddedPODArray<StringRef> getCachedComplexKeys() const override
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{
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if constexpr (dictionary_key_type == DictionaryKeyType::Complex)
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return getCachedKeysImpl();
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else
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throw Exception(ErrorCodes::NOT_IMPLEMENTED, "Method getCachedComplexKeys is not supported for simple key storage");
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}
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size_t getSize() const override { return size; }
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double getLoadFactor() const override { return static_cast<double>(size) / configuration.max_size_in_cells; }
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size_t getBytesAllocated() const override
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{
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size_t attributes_size_in_bytes = 0;
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size_t attributes_size = attributes.size();
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for (size_t attribute_index = 0; attribute_index < attributes_size; ++attribute_index)
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{
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getAttributeContainer(attribute_index, [&](const auto & container)
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{
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attributes_size_in_bytes += container.capacity() * sizeof(container[0]);
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});
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}
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return arena.allocatedBytes() + sizeof(Cell) * configuration.max_size_in_cells + attributes_size_in_bytes;
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}
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private:
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struct FetchedKey
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{
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FetchedKey(size_t element_index_, bool is_default_)
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: element_index(element_index_)
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, is_default(is_default_)
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{}
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size_t element_index;
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bool is_default;
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};
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template <typename KeysStorageFetchResult>
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KeysStorageFetchResult fetchColumnsForKeysImpl(
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const PaddedPODArray<KeyType> & keys,
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const DictionaryStorageFetchRequest & fetch_request,
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IColumn::Filter * const default_mask)
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{
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KeysStorageFetchResult result;
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result.fetched_columns = fetch_request.makeAttributesResultColumns();
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result.key_index_to_state.resize_fill(keys.size());
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const time_t now = std::chrono::system_clock::to_time_t(std::chrono::system_clock::now());
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size_t fetched_columns_index = 0;
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size_t fetched_columns_index_without_default = 0;
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size_t keys_size = keys.size();
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PaddedPODArray<FetchedKey> fetched_keys;
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fetched_keys.resize_fill(keys_size);
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for (size_t key_index = 0; key_index < keys_size; ++key_index)
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{
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auto key = keys[key_index];
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auto [key_state, cell_index] = getKeyStateAndCellIndex(key, now);
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if (unlikely(key_state == KeyState::not_found))
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{
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result.key_index_to_state[key_index] = {KeyState::not_found};
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++result.not_found_keys_size;
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continue;
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}
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auto & cell = cells[cell_index];
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result.expired_keys_size += static_cast<size_t>(key_state == KeyState::expired);
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result.key_index_to_state[key_index] = {key_state,
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default_mask ? fetched_columns_index_without_default : fetched_columns_index};
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fetched_keys[fetched_columns_index] = FetchedKey(cell.element_index, cell.is_default);
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++fetched_columns_index;
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if (!cell.is_default)
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++fetched_columns_index_without_default;
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result.key_index_to_state[key_index].setDefaultValue(cell.is_default);
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result.default_keys_size += cell.is_default;
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}
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result.found_keys_size = keys_size - (result.expired_keys_size + result.not_found_keys_size);
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for (size_t attribute_index = 0; attribute_index < fetch_request.attributesSize(); ++attribute_index)
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{
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if (!fetch_request.shouldFillResultColumnWithIndex(attribute_index))
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continue;
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auto & attribute = attributes[attribute_index];
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auto & fetched_column = *result.fetched_columns[attribute_index];
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fetched_column.reserve(default_mask ? fetched_columns_index_without_default :
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fetched_columns_index);
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if (!default_mask)
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{
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const auto & default_value_provider =
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fetch_request.defaultValueProviderAtIndex(attribute_index);
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if (unlikely(attribute.is_nullable))
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{
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getItemsForFetchedKeys<Field>(
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attribute,
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fetched_columns_index,
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fetched_keys,
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[&](Field & value) { fetched_column.insert(value); },
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default_value_provider);
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}
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else
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{
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auto type_call = [&](const auto & dictionary_attribute_type)
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{
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using Type = std::decay_t<decltype(dictionary_attribute_type)>;
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using AttributeType = typename Type::AttributeType;
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using ColumnProvider = DictionaryAttributeColumnProvider<AttributeType>;
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using ColumnType = typename ColumnProvider::ColumnType;
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using ValueType = DictionaryValueType<AttributeType>;
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ColumnType & column_typed = static_cast<ColumnType &>(fetched_column);
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if constexpr (std::is_same_v<ValueType, Array>)
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{
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getItemsForFetchedKeys<ValueType>(
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attribute,
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fetched_columns_index,
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fetched_keys,
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[&](Array & value) { fetched_column.insert(value); },
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default_value_provider);
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}
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else if constexpr (std::is_same_v<ValueType, StringRef>)
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{
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getItemsForFetchedKeys<ValueType>(
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attribute,
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fetched_columns_index,
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fetched_keys,
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[&](StringRef value) { fetched_column.insertData(value.data, value.size); },
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default_value_provider);
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}
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else
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{
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auto & data = column_typed.getData();
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getItemsForFetchedKeys<ValueType>(
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attribute,
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fetched_columns_index,
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fetched_keys,
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[&](auto value) { data.push_back(static_cast<AttributeType>(value)); },
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default_value_provider);
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}
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};
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callOnDictionaryAttributeType(attribute.type, type_call);
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}
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}
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else
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{
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if (unlikely(attribute.is_nullable))
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{
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getItemsForFetchedKeysShortCircuit<Field>(
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attribute,
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fetched_columns_index,
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fetched_keys,
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[&](Field & value) { fetched_column.insert(value); },
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*default_mask);
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}
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else
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{
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auto type_call = [&](const auto & dictionary_attribute_type)
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{
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using Type = std::decay_t<decltype(dictionary_attribute_type)>;
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using AttributeType = typename Type::AttributeType;
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using ColumnProvider = DictionaryAttributeColumnProvider<AttributeType>;
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using ColumnType = typename ColumnProvider::ColumnType;
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using ValueType = DictionaryValueType<AttributeType>;
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ColumnType & column_typed = static_cast<ColumnType &>(fetched_column);
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if constexpr (std::is_same_v<ValueType, Array>)
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{
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getItemsForFetchedKeysShortCircuit<ValueType>(
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attribute,
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fetched_columns_index,
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fetched_keys,
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[&](Array & value) { fetched_column.insert(value); },
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*default_mask);
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}
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else if constexpr (std::is_same_v<ValueType, StringRef>)
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{
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getItemsForFetchedKeysShortCircuit<ValueType>(
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attribute,
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fetched_columns_index,
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fetched_keys,
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[&](StringRef value) { fetched_column.insertData(value.data, value.size); },
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*default_mask);
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}
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else
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{
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auto & data = column_typed.getData();
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getItemsForFetchedKeysShortCircuit<ValueType>(
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attribute,
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fetched_columns_index,
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fetched_keys,
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[&](auto value) { data.push_back(static_cast<AttributeType>(value)); },
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*default_mask);
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}
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};
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callOnDictionaryAttributeType(attribute.type, type_call);
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}
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}
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}
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return result;
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}
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void insertColumnsForKeysImpl(const PaddedPODArray<KeyType> & keys, Columns columns)
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{
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const auto now = std::chrono::system_clock::now();
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Field column_value;
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for (size_t key_index = 0; key_index < keys.size(); ++key_index)
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{
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auto key = keys[key_index];
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size_t cell_index = getCellIndexForInsert(key);
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auto & cell = cells[cell_index];
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bool cell_was_default = cell.is_default;
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cell.is_default = false;
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bool was_inserted = cell.deadline == 0;
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if (was_inserted)
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{
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if constexpr (std::is_same_v<KeyType, StringRef>)
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cell.key = copyStringInArena(arena, key);
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else
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cell.key = key;
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for (size_t attribute_index = 0; attribute_index < columns.size(); ++attribute_index)
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{
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auto & column = columns[attribute_index];
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getAttributeContainer(attribute_index, [&](auto & container)
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{
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container.emplace_back();
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cell.element_index = container.size() - 1;
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using ElementType = std::decay_t<decltype(container[0])>;
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column->get(key_index, column_value);
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if constexpr (std::is_same_v<ElementType, Field>)
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{
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container.back() = column_value;
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}
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else if constexpr (std::is_same_v<ElementType, StringRef>)
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{
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const String & string_value = column_value.get<String>();
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StringRef inserted_value = copyStringInArena(arena, string_value);
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container.back() = inserted_value;
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}
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else
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{
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container.back() = static_cast<ElementType>(column_value.get<ElementType>());
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}
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});
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}
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++size;
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}
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else
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{
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if (cell.key != key)
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{
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if constexpr (std::is_same_v<KeyType, StringRef>)
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{
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char * data = const_cast<char *>(cell.key.data);
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arena.free(data, cell.key.size);
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cell.key = copyStringInArena(arena, key);
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}
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else
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cell.key = key;
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}
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/// Put values into existing index
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size_t index_to_use = cell.element_index;
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for (size_t attribute_index = 0; attribute_index < columns.size(); ++attribute_index)
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{
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auto & column = columns[attribute_index];
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getAttributeContainer(attribute_index, [&](auto & container)
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{
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using ElementType = std::decay_t<decltype(container[0])>;
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column->get(key_index, column_value);
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if constexpr (std::is_same_v<ElementType, Field>)
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{
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container[index_to_use] = column_value;
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}
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else if constexpr (std::is_same_v<ElementType, StringRef>)
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{
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const String & string_value = column_value.get<String>();
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StringRef inserted_value = copyStringInArena(arena, string_value);
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if (!cell_was_default)
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{
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StringRef previous_value = container[index_to_use];
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arena.free(const_cast<char *>(previous_value.data), previous_value.size);
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}
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container[index_to_use] = inserted_value;
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}
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else
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{
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container[index_to_use] = static_cast<ElementType>(column_value.get<ElementType>());
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}
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});
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}
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}
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setCellDeadline(cell, now);
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}
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}
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void insertDefaultKeysImpl(const PaddedPODArray<KeyType> & keys)
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{
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const auto now = std::chrono::system_clock::now();
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size_t keys_size = keys.size();
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for (size_t key_index = 0; key_index < keys_size; ++key_index)
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{
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auto key = keys[key_index];
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size_t cell_index = getCellIndexForInsert(key);
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auto & cell = cells[cell_index];
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bool was_inserted = cell.deadline == 0;
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bool cell_was_default = cell.is_default;
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cell.is_default = true;
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if (was_inserted)
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{
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if constexpr (std::is_same_v<KeyType, StringRef>)
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cell.key = copyStringInArena(arena, key);
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else
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cell.key = key;
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for (size_t attribute_index = 0; attribute_index < attributes.size(); ++attribute_index)
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{
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getAttributeContainer(attribute_index, [&](auto & container)
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{
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container.emplace_back();
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cell.element_index = container.size() - 1;
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});
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}
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++size;
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}
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else
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{
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for (size_t attribute_index = 0; attribute_index < attributes.size(); ++attribute_index)
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{
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getAttributeContainer(attribute_index, [&](const auto & container)
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{
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using ElementType = std::decay_t<decltype(container[0])>;
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if constexpr (std::is_same_v<ElementType, StringRef>)
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{
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if (!cell_was_default)
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{
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StringRef previous_value = container[cell.element_index];
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arena.free(const_cast<char *>(previous_value.data), previous_value.size);
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}
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}
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});
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}
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if (cell.key != key)
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{
|
|
if constexpr (std::is_same_v<KeyType, StringRef>)
|
|
{
|
|
char * data = const_cast<char *>(cell.key.data);
|
|
arena.free(data, cell.key.size);
|
|
cell.key = copyStringInArena(arena, key);
|
|
}
|
|
else
|
|
cell.key = key;
|
|
}
|
|
}
|
|
|
|
setCellDeadline(cell, now);
|
|
}
|
|
}
|
|
|
|
PaddedPODArray<KeyType> getCachedKeysImpl() const
|
|
{
|
|
PaddedPODArray<KeyType> result;
|
|
result.reserve(size);
|
|
|
|
for (auto & cell : cells)
|
|
{
|
|
if (cell.deadline == 0)
|
|
continue;
|
|
|
|
if (cell.is_default)
|
|
continue;
|
|
|
|
result.emplace_back(cell.key);
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
template <typename GetContainerFunc>
|
|
void getAttributeContainer(size_t attribute_index, GetContainerFunc && func)
|
|
{
|
|
auto & attribute = attributes[attribute_index];
|
|
auto & attribute_type = attribute.type;
|
|
|
|
if (unlikely(attribute.is_nullable))
|
|
{
|
|
auto & container = std::get<ContainerType<Field>>(attribute.attribute_container);
|
|
std::forward<GetContainerFunc>(func)(container);
|
|
}
|
|
else
|
|
{
|
|
auto type_call = [&](const auto & dictionary_attribute_type)
|
|
{
|
|
using Type = std::decay_t<decltype(dictionary_attribute_type)>;
|
|
using AttributeType = typename Type::AttributeType;
|
|
using ValueType = DictionaryValueType<AttributeType>;
|
|
|
|
auto & container = std::get<ContainerType<ValueType>>(attribute.attribute_container);
|
|
std::forward<GetContainerFunc>(func)(container);
|
|
};
|
|
|
|
callOnDictionaryAttributeType(attribute_type, type_call);
|
|
}
|
|
}
|
|
|
|
template <typename GetContainerFunc>
|
|
void getAttributeContainer(size_t attribute_index, GetContainerFunc && func) const
|
|
{
|
|
return const_cast<std::decay_t<decltype(*this)> *>(this)->template getAttributeContainer(attribute_index, std::forward<GetContainerFunc>(func));
|
|
}
|
|
|
|
template<typename ValueType>
|
|
using ContainerType = std::conditional_t<
|
|
std::is_same_v<ValueType, Field> || std::is_same_v<ValueType, Array>,
|
|
std::vector<ValueType>,
|
|
PaddedPODArray<ValueType>>;
|
|
|
|
struct Attribute
|
|
{
|
|
AttributeUnderlyingType type;
|
|
bool is_nullable;
|
|
|
|
std::variant<
|
|
ContainerType<UInt8>,
|
|
ContainerType<UInt16>,
|
|
ContainerType<UInt32>,
|
|
ContainerType<UInt64>,
|
|
ContainerType<UInt128>,
|
|
ContainerType<UInt256>,
|
|
ContainerType<Int8>,
|
|
ContainerType<Int16>,
|
|
ContainerType<Int32>,
|
|
ContainerType<Int64>,
|
|
ContainerType<Int128>,
|
|
ContainerType<Int256>,
|
|
ContainerType<Decimal32>,
|
|
ContainerType<Decimal64>,
|
|
ContainerType<Decimal128>,
|
|
ContainerType<Decimal256>,
|
|
ContainerType<DateTime64>,
|
|
ContainerType<Float32>,
|
|
ContainerType<Float64>,
|
|
ContainerType<UUID>,
|
|
ContainerType<IPv4>,
|
|
ContainerType<IPv6>,
|
|
ContainerType<StringRef>,
|
|
ContainerType<Array>,
|
|
ContainerType<Field>> attribute_container;
|
|
};
|
|
|
|
template <typename ValueType, typename ValueSetter>
|
|
void getItemsForFetchedKeys(
|
|
Attribute & attribute,
|
|
size_t fetched_keys_size,
|
|
PaddedPODArray<FetchedKey> & fetched_keys,
|
|
ValueSetter && value_setter,
|
|
const DefaultValueProvider & default_value_provider)
|
|
{
|
|
auto & container = std::get<ContainerType<ValueType>>(attribute.attribute_container);
|
|
|
|
for (size_t fetched_key_index = 0; fetched_key_index < fetched_keys_size; ++fetched_key_index)
|
|
{
|
|
auto fetched_key = fetched_keys[fetched_key_index];
|
|
|
|
if (unlikely(fetched_key.is_default))
|
|
{
|
|
auto default_value = default_value_provider.getDefaultValue(fetched_key_index);
|
|
|
|
if constexpr (std::is_same_v<ValueType, Field>)
|
|
{
|
|
value_setter(default_value);
|
|
}
|
|
else if constexpr (std::is_same_v<ValueType, StringRef>)
|
|
{
|
|
auto & value = default_value.get<String>();
|
|
value_setter(value);
|
|
}
|
|
else
|
|
{
|
|
value_setter(default_value.get<ValueType>());
|
|
}
|
|
}
|
|
else
|
|
{
|
|
value_setter(container[fetched_key.element_index]);
|
|
}
|
|
}
|
|
}
|
|
|
|
template <typename ValueType, typename ValueSetter>
|
|
void getItemsForFetchedKeysShortCircuit(
|
|
Attribute & attribute,
|
|
size_t fetched_keys_size,
|
|
PaddedPODArray<FetchedKey> & fetched_keys,
|
|
ValueSetter && value_setter,
|
|
IColumn::Filter & default_mask)
|
|
{
|
|
default_mask.resize(fetched_keys_size);
|
|
auto & container = std::get<ContainerType<ValueType>>(attribute.attribute_container);
|
|
|
|
for (size_t fetched_key_index = 0; fetched_key_index < fetched_keys_size; ++fetched_key_index)
|
|
{
|
|
auto fetched_key = fetched_keys[fetched_key_index];
|
|
|
|
if (unlikely(fetched_key.is_default))
|
|
default_mask[fetched_key_index] = 1;
|
|
else
|
|
{
|
|
default_mask[fetched_key_index] = 0;
|
|
value_setter(container[fetched_key.element_index]);
|
|
}
|
|
}
|
|
}
|
|
|
|
void createAttributes(const DictionaryStructure & dictionary_structure)
|
|
{
|
|
/// For each dictionary attribute create storage attribute
|
|
/// For simple attributes create PODArray, for complex vector of Fields
|
|
|
|
attributes.reserve(dictionary_structure.attributes.size());
|
|
|
|
for (const auto & dictionary_attribute : dictionary_structure.attributes)
|
|
{
|
|
auto attribute_type = dictionary_attribute.underlying_type;
|
|
|
|
auto type_call = [&](const auto & dictionary_attribute_type)
|
|
{
|
|
using Type = std::decay_t<decltype(dictionary_attribute_type)>;
|
|
using AttributeType = typename Type::AttributeType;
|
|
using ValueType = DictionaryValueType<AttributeType>;
|
|
|
|
attributes.emplace_back();
|
|
auto & last_attribute = attributes.back();
|
|
last_attribute.type = attribute_type;
|
|
last_attribute.is_nullable = dictionary_attribute.is_nullable;
|
|
|
|
if (dictionary_attribute.is_nullable)
|
|
last_attribute.attribute_container = ContainerType<Field>();
|
|
else
|
|
last_attribute.attribute_container = ContainerType<ValueType>();
|
|
};
|
|
|
|
callOnDictionaryAttributeType(attribute_type, type_call);
|
|
}
|
|
}
|
|
|
|
using TimePoint = std::chrono::system_clock::time_point;
|
|
|
|
struct Cell
|
|
{
|
|
KeyType key;
|
|
size_t element_index;
|
|
bool is_default;
|
|
time_t deadline;
|
|
};
|
|
|
|
CacheDictionaryStorageConfiguration configuration;
|
|
|
|
pcg64 rnd_engine;
|
|
|
|
size_t size_overlap_mask = 0;
|
|
|
|
size_t size = 0;
|
|
|
|
PaddedPODArray<Cell> cells;
|
|
|
|
ArenaWithFreeLists arena;
|
|
|
|
std::vector<Attribute> attributes;
|
|
|
|
inline void setCellDeadline(Cell & cell, TimePoint now)
|
|
{
|
|
if (configuration.lifetime.min_sec == 0 && configuration.lifetime.max_sec == 0)
|
|
{
|
|
/// This maybe not obvious, but when we define is this cell is expired or expired permanently, we add strict_max_lifetime_seconds
|
|
/// to the expiration time. And it overflows pretty well.
|
|
auto deadline = std::chrono::time_point<std::chrono::system_clock>::max() - 2 * std::chrono::seconds(configuration.strict_max_lifetime_seconds);
|
|
cell.deadline = std::chrono::system_clock::to_time_t(deadline);
|
|
return;
|
|
}
|
|
|
|
size_t min_sec_lifetime = configuration.lifetime.min_sec;
|
|
size_t max_sec_lifetime = configuration.lifetime.max_sec;
|
|
|
|
std::uniform_int_distribution<UInt64> distribution{min_sec_lifetime, max_sec_lifetime};
|
|
|
|
auto deadline = now + std::chrono::seconds(distribution(rnd_engine));
|
|
cell.deadline = std::chrono::system_clock::to_time_t(deadline);
|
|
}
|
|
|
|
inline size_t getCellIndex(const KeyType key) const
|
|
{
|
|
const size_t hash = DefaultHash<KeyType>()(key);
|
|
const size_t index = hash & size_overlap_mask;
|
|
return index;
|
|
}
|
|
|
|
using KeyStateAndCellIndex = std::pair<KeyState::State, size_t>;
|
|
|
|
inline KeyStateAndCellIndex getKeyStateAndCellIndex(const KeyType key, const time_t now) const
|
|
{
|
|
size_t place_value = getCellIndex(key);
|
|
const size_t place_value_end = place_value + max_collision_length;
|
|
|
|
time_t max_lifetime_seconds = static_cast<time_t>(configuration.strict_max_lifetime_seconds);
|
|
|
|
for (; place_value < place_value_end; ++place_value)
|
|
{
|
|
const auto cell_place_value = place_value & size_overlap_mask;
|
|
const auto & cell = cells[cell_place_value];
|
|
|
|
if (cell.key != key)
|
|
continue;
|
|
|
|
if (unlikely(now > cell.deadline + max_lifetime_seconds))
|
|
return std::make_pair(KeyState::not_found, cell_place_value);
|
|
|
|
if (unlikely(now > cell.deadline))
|
|
return std::make_pair(KeyState::expired, cell_place_value);
|
|
|
|
return std::make_pair(KeyState::found, cell_place_value);
|
|
}
|
|
|
|
return std::make_pair(KeyState::not_found, place_value & size_overlap_mask);
|
|
}
|
|
|
|
inline size_t getCellIndexForInsert(const KeyType & key) const
|
|
{
|
|
size_t place_value = getCellIndex(key);
|
|
const size_t place_value_end = place_value + max_collision_length;
|
|
size_t oldest_place_value = place_value;
|
|
|
|
time_t oldest_time = std::numeric_limits<time_t>::max();
|
|
|
|
for (; place_value < place_value_end; ++place_value)
|
|
{
|
|
const size_t cell_place_value = place_value & size_overlap_mask;
|
|
const Cell cell = cells[cell_place_value];
|
|
|
|
if (cell.deadline == 0)
|
|
return cell_place_value;
|
|
|
|
if (cell.key == key)
|
|
return cell_place_value;
|
|
|
|
if (cell.deadline < oldest_time)
|
|
{
|
|
oldest_time = cell.deadline;
|
|
oldest_place_value = cell_place_value;
|
|
}
|
|
}
|
|
|
|
return oldest_place_value;
|
|
}
|
|
};
|
|
|
|
}
|