ClickHouse/dbms/include/DB/Dictionaries/CacheDictionary.h
2016-08-07 12:09:18 +03:00

245 lines
7.6 KiB
C++

#pragma once
#include <DB/Dictionaries/IDictionary.h>
#include <DB/Dictionaries/IDictionarySource.h>
#include <DB/Dictionaries/DictionaryStructure.h>
#include <DB/Common/HashTable/HashMap.h>
#include <DB/Common/ArenaWithFreeLists.h>
#include <DB/Columns/ColumnString.h>
#include <ext/scope_guard.hpp>
#include <ext/bit_cast.hpp>
#include <ext/range.hpp>
#include <ext/size.hpp>
#include <ext/map.hpp>
#include <Poco/RWLock.h>
#include <cmath>
#include <atomic>
#include <chrono>
#include <vector>
#include <map>
#include <tuple>
#include <random>
namespace DB
{
class CacheDictionary final : public IDictionary
{
public:
CacheDictionary(const std::string & name, const DictionaryStructure & dict_struct,
DictionarySourcePtr source_ptr, const DictionaryLifetime dict_lifetime,
const std::size_t size);
CacheDictionary(const CacheDictionary & other);
std::exception_ptr getCreationException() const override { return {}; }
std::string getName() const override { return name; }
std::string getTypeName() const override { return "Cache"; }
std::size_t getBytesAllocated() const override { return bytes_allocated + (string_arena ? string_arena->size() : 0); }
std::size_t getQueryCount() const override { return query_count.load(std::memory_order_relaxed); }
double getHitRate() const override
{
return static_cast<double>(hit_count.load(std::memory_order_acquire)) /
query_count.load(std::memory_order_relaxed);
}
std::size_t getElementCount() const override { return element_count.load(std::memory_order_relaxed); }
double getLoadFactor() const override
{
return static_cast<double>(element_count.load(std::memory_order_relaxed)) / size;
}
bool isCached() const override { return true; }
DictionaryPtr clone() const override { return std::make_unique<CacheDictionary>(*this); }
const IDictionarySource * getSource() const override { return source_ptr.get(); }
const DictionaryLifetime & getLifetime() const override { return dict_lifetime; }
const DictionaryStructure & getStructure() const override { return dict_struct; }
std::chrono::time_point<std::chrono::system_clock> getCreationTime() const override
{
return creation_time;
}
bool isInjective(const std::string & attribute_name) const override
{
return dict_struct.attributes[&getAttribute(attribute_name) - attributes.data()].injective;
}
bool hasHierarchy() const override { return hierarchical_attribute; }
void toParent(const PaddedPODArray<Key> & ids, PaddedPODArray<Key> & out) const override;
#define DECLARE(TYPE)\
void get##TYPE(const std::string & attribute_name, const PaddedPODArray<Key> & ids, PaddedPODArray<TYPE> & out) const;
DECLARE(UInt8)
DECLARE(UInt16)
DECLARE(UInt32)
DECLARE(UInt64)
DECLARE(Int8)
DECLARE(Int16)
DECLARE(Int32)
DECLARE(Int64)
DECLARE(Float32)
DECLARE(Float64)
#undef DECLARE
void getString(const std::string & attribute_name, const PaddedPODArray<Key> & ids, ColumnString * out) const;
#define DECLARE(TYPE)\
void get##TYPE(\
const std::string & attribute_name, const PaddedPODArray<Key> & ids, const PaddedPODArray<TYPE> & def,\
PaddedPODArray<TYPE> & out) const;
DECLARE(UInt8)
DECLARE(UInt16)
DECLARE(UInt32)
DECLARE(UInt64)
DECLARE(Int8)
DECLARE(Int16)
DECLARE(Int32)
DECLARE(Int64)
DECLARE(Float32)
DECLARE(Float64)
#undef DECLARE
void getString(
const std::string & attribute_name, const PaddedPODArray<Key> & ids, const ColumnString * const def,
ColumnString * const out) const;
#define DECLARE(TYPE)\
void get##TYPE(\
const std::string & attribute_name, const PaddedPODArray<Key> & ids, const TYPE def, PaddedPODArray<TYPE> & out) const;
DECLARE(UInt8)
DECLARE(UInt16)
DECLARE(UInt32)
DECLARE(UInt64)
DECLARE(Int8)
DECLARE(Int16)
DECLARE(Int32)
DECLARE(Int64)
DECLARE(Float32)
DECLARE(Float64)
#undef DECLARE
void getString(
const std::string & attribute_name, const PaddedPODArray<Key> & ids, const String & def,
ColumnString * const out) const;
void has(const PaddedPODArray<Key> & ids, PaddedPODArray<UInt8> & out) const override;
private:
template <typename Value> using MapType = HashMap<Key, Value>;
template <typename Value> using ContainerType = Value[];
template <typename Value> using ContainerPtrType = std::unique_ptr<ContainerType<Value>>;
struct CellMetadata final
{
using time_point_t = std::chrono::system_clock::time_point;
using time_point_rep_t = time_point_t::rep;
using time_point_urep_t = std::make_unsigned_t<time_point_rep_t>;
static constexpr std::uint64_t EXPIRES_AT_MASK = std::numeric_limits<time_point_rep_t>::max();
static constexpr std::uint64_t IS_DEFAULT_MASK = ~EXPIRES_AT_MASK;
std::uint64_t id;
/// Stores both expiration time and `is_default` flag in the most significant bit
time_point_urep_t data;
/// Sets expiration time, resets `is_default` flag to false
time_point_t expiresAt() const { return ext::safe_bit_cast<time_point_t>(data & EXPIRES_AT_MASK); }
void setExpiresAt(const time_point_t & t) { data = ext::safe_bit_cast<time_point_urep_t>(t); }
bool isDefault() const { return (data & IS_DEFAULT_MASK) == IS_DEFAULT_MASK; }
void setDefault() { data |= IS_DEFAULT_MASK; }
};
struct Attribute final
{
AttributeUnderlyingType type;
std::tuple<
UInt8, UInt16, UInt32, UInt64,
Int8, Int16, Int32, Int64,
Float32, Float64,
String> null_values;
std::tuple<
ContainerPtrType<UInt8>, ContainerPtrType<UInt16>, ContainerPtrType<UInt32>, ContainerPtrType<UInt64>,
ContainerPtrType<Int8>, ContainerPtrType<Int16>, ContainerPtrType<Int32>, ContainerPtrType<Int64>,
ContainerPtrType<Float32>, ContainerPtrType<Float64>,
ContainerPtrType<StringRef>> arrays;
};
void createAttributes();
Attribute createAttributeWithType(const AttributeUnderlyingType type, const Field & null_value);
template <typename OutputType, typename DefaultGetter>
void getItemsNumber(
Attribute & attribute,
const PaddedPODArray<Key> & ids,
PaddedPODArray<OutputType> & out,
DefaultGetter && get_default) const;
template <typename AttributeType, typename OutputType, typename DefaultGetter>
void getItemsNumberImpl(
Attribute & attribute,
const PaddedPODArray<Key> & ids,
PaddedPODArray<OutputType> & out,
DefaultGetter && get_default) const;
template <typename DefaultGetter>
void getItemsString(
Attribute & attribute,
const PaddedPODArray<Key> & ids,
ColumnString * out,
DefaultGetter && get_default) const;
template <typename PresentIdHandler, typename AbsentIdHandler>
void update(
const std::vector<Key> & requested_ids, PresentIdHandler && on_cell_updated,
AbsentIdHandler && on_id_not_found) const;
std::uint64_t getCellIdx(const Key id) const;
void setDefaultAttributeValue(Attribute & attribute, const Key idx) const;
void setAttributeValue(Attribute & attribute, const Key idx, const Field & value) const;
Attribute & getAttribute(const std::string & attribute_name) const;
const std::string name;
const DictionaryStructure dict_struct;
const DictionarySourcePtr source_ptr;
const DictionaryLifetime dict_lifetime;
mutable Poco::RWLock rw_lock;
const std::size_t size;
const std::uint64_t zero_cell_idx{getCellIdx(0)};
std::map<std::string, std::size_t> attribute_index_by_name;
mutable std::vector<Attribute> attributes;
mutable std::vector<CellMetadata> cells;
Attribute * hierarchical_attribute = nullptr;
std::unique_ptr<ArenaWithFreeLists> string_arena;
mutable std::mt19937_64 rnd_engine;
mutable std::size_t bytes_allocated = 0;
mutable std::atomic<std::size_t> element_count{0};
mutable std::atomic<std::size_t> hit_count{0};
mutable std::atomic<std::size_t> query_count{0};
const std::chrono::time_point<std::chrono::system_clock> creation_time = std::chrono::system_clock::now();
};
}