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#pragma once
#include <Dictionaries/CassandraHelpers.h>
#if USE_CASSANDRA
#include "DictionaryStructure.h"
#include "IDictionarySource.h"
#include "ExternalQueryBuilder.h"
#include <Core/Block.h>
#include <Interpreters/Context_fwd.h>
#include <Poco/Logger.h>
#include <mutex>
namespace DB
{
class CassandraDictionarySource final : public IDictionarySource
{
public:
struct Configuration
{
String host;
UInt16 port;
String user;
String password;
String db;
String table;
String query;
CassConsistency consistency;
bool allow_filtering;
/// TODO get information about key from the driver
size_t partition_key_prefix;
size_t max_threads;
String where;
Configuration(const Poco::Util::AbstractConfiguration & config, const String & config_prefix);
void setConsistency(const String & config_str);
};
CassandraDictionarySource(
const DictionaryStructure & dict_struct,
const Configuration & configuration,
const Block & sample_block);
CassandraDictionarySource(
const DictionaryStructure & dict_struct,
const Poco::Util::AbstractConfiguration & config,
const String & config_prefix,
Block & sample_block);
QueryPipeline loadAll() override;
bool supportsSelectiveLoad() const override { return true; }
bool isModified() const override { return true; }
bool hasUpdateField() const override { return false; }
DictionarySourcePtr clone() const override
{
return std::make_shared<CassandraDictionarySource>(dict_struct, configuration, sample_block);
}
QueryPipeline loadIds(const std::vector<UInt64> & ids) override;
QueryPipeline loadKeys(const Columns & key_columns, const std::vector<size_t> & requested_rows) override;
QueryPipeline loadUpdatedAll() override;
String toString() const override;
private:
void maybeAllowFiltering(String & query) const;
CassSessionShared getSession();
Poco::Logger * log;
const DictionaryStructure dict_struct;
const Configuration configuration;
Block sample_block;
ExternalQueryBuilder query_builder;
CassClusterPtr cluster;
std::mutex connect_mutex;
CassSessionWeak maybe_session TSA_GUARDED_BY(connect_mutex);
};
}
#endif
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