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97 lines
2.5 KiB
C++
97 lines
2.5 KiB
C++
#pragma once
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#include <Storages/IStorage.h>
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#include <Poco/File.h>
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#include <Poco/Path.h>
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#include <common/logger_useful.h>
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#include <atomic>
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#include <shared_mutex>
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#include <ext/shared_ptr_helper.h>
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namespace DB
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{
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class StorageFileBlockInputStream;
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class StorageFileBlockOutputStream;
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class StorageFile : public ext::shared_ptr_helper<StorageFile>, public IStorage
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{
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public:
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std::string getName() const override
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{
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return "File";
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}
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std::string getTableName() const override
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{
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return table_name;
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}
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const NamesAndTypesList & getColumnsListImpl() const override
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{
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return columns;
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}
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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(
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const ASTPtr & query,
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const Settings & settings) override;
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void drop() 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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protected:
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friend class StorageFileBlockInputStream;
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friend class StorageFileBlockOutputStream;
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/** there are three options (ordered by priority):
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- use specified file descriptor if (fd >= 0)
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- use specified table_path if it isn't empty
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- create own tabale inside data/db/table/
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*/
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StorageFile(
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const std::string & table_path_,
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int table_fd_,
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const std::string & db_dir_path,
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const std::string & table_name_,
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const std::string & format_name_,
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const NamesAndTypesList & 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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Context & context_);
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private:
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std::string table_name;
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std::string format_name;
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NamesAndTypesList columns;
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Context & context_global;
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std::string path;
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int table_fd = -1;
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bool is_db_table = true; /// Table is stored in real database, not user's file
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bool use_table_fd = false; /// Use table_fd insted of path
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std::atomic<bool> table_fd_was_used{false}; /// To detect repeating reads from stdin
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off_t table_fd_init_offset = -1; /// Initial position of fd, used for repeating reads
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mutable std::shared_mutex rwlock;
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Logger * log = &Logger::get("StorageFile");
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};
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}
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