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84 lines
2.3 KiB
C++
84 lines
2.3 KiB
C++
#pragma once
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#include <map>
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#include <shared_mutex>
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#include <ext/shared_ptr_helper.h>
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#include <Poco/File.h>
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#include <Storages/IStorage.h>
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#include <Common/FileChecker.h>
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#include <Common/escapeForFileName.h>
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#include <Core/Defines.h>
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namespace DB
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{
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/** Implements a table engine that is suitable for small chunks of the log.
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* In doing so, stores all the columns in a single Native file, with a nearby index.
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*/
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class StorageStripeLog : public ext::shared_ptr_helper<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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friend struct ext::shared_ptr_helper<StorageStripeLog>;
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public:
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std::string getName() const override { return "StripeLog"; }
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std::string getTableName() const override { return table_name; }
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std::string getDatabaseName() const override { return database_name; }
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BlockInputStreams read(
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const Names & column_names,
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const SelectQueryInfo & query_info,
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const Context & context,
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QueryProcessingStage::Enum processed_stage,
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size_t max_block_size,
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unsigned num_streams) override;
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BlockOutputStreamPtr write(const ASTPtr & query, const Context & context) override;
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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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CheckResults checkData(const ASTPtr & /* query */, const Context & /* context */) override;
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/// Data of the file.
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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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using Files_t = std::map<String, ColumnData>;
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std::string full_path() const { return path + escapeForFileName(table_name) + '/';}
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String getDataPath() const override { return full_path(); }
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void truncate(const ASTPtr &, const Context &) override;
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private:
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String path;
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String table_name;
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String database_name;
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size_t max_compress_block_size;
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FileChecker file_checker;
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mutable std::shared_mutex rwlock;
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Logger * log;
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protected:
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StorageStripeLog(
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const std::string & path_,
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const std::string & database_name_,
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const std::string & table_name_,
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const ColumnsDescription & columns_,
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const ConstraintsDescription & constraints_,
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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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