2015-08-16 07:01:41 +00:00
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#pragma once
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#include <map>
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#include <Poco/File.h>
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#include <DB/Storages/IStorage.h>
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#include <DB/Common/FileChecker.h>
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2015-09-29 00:53:10 +00:00
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#include <DB/Common/escapeForFileName.h>
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2015-08-16 07:01:41 +00:00
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namespace DB
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{
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/** Реализует хранилище, подходящее для маленьких кусочков лога.
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* При этом, хранит все столбцы в одном файле формата Native, с расположенным рядом индексом.
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*/
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class StorageStripeLog : public IStorage
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{
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friend class StripeLogBlockInputStream;
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friend class StripeLogBlockOutputStream;
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public:
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/** Подцепить таблицу с соответствующим именем, по соответствующему пути (с / на конце),
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* (корректность имён и путей не проверяется)
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* состоящую из указанных столбцов.
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* Если не указано attach - создать директорию, если её нет.
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*/
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static StoragePtr create(
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const std::string & path_,
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const std::string & name_,
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NamesAndTypesListPtr columns_,
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const NamesAndTypesList & materialized_columns_,
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const NamesAndTypesList & alias_columns_,
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const ColumnDefaults & column_defaults_,
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bool attach,
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size_t max_compress_block_size_ = DEFAULT_MAX_COMPRESS_BLOCK_SIZE);
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std::string getName() const override { return "StripeLog"; }
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std::string getTableName() const override { return name; }
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const NamesAndTypesList & getColumnsListImpl() const override { return *columns; }
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BlockInputStreams read(
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const Names & column_names,
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ASTPtr query,
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const Context & context,
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const Settings & settings,
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QueryProcessingStage::Enum & processed_stage,
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size_t max_block_size = DEFAULT_BLOCK_SIZE,
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unsigned threads = 1) override;
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2015-09-10 20:43:42 +00:00
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BlockOutputStreamPtr write(ASTPtr query, const Settings & settings) override;
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2015-08-16 07:01:41 +00:00
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void rename(const String & new_path_to_db, const String & new_database_name, const String & new_table_name) override;
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bool checkData() const override;
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/// Данные файла.
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struct ColumnData
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{
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Poco::File data_file;
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};
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typedef std::map<String, ColumnData> Files_t;
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std::string full_path() { return path + escapeForFileName(name) + '/';}
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private:
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String path;
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String name;
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NamesAndTypesListPtr columns;
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size_t max_compress_block_size;
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FileChecker file_checker;
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2015-08-16 08:18:34 +00:00
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Poco::RWLock rwlock;
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2015-08-16 07:01:41 +00:00
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Logger * log;
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StorageStripeLog(
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const std::string & path_,
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const std::string & name_,
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NamesAndTypesListPtr columns_,
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const NamesAndTypesList & materialized_columns_,
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const NamesAndTypesList & alias_columns_,
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const ColumnDefaults & column_defaults_,
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bool attach,
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size_t max_compress_block_size_);
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};
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}
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