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125 lines
3.2 KiB
C++
125 lines
3.2 KiB
C++
#pragma once
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#include <Poco/File.h>
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#include <DB/Core/NamesAndTypes.h>
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#include <DB/IO/ReadBufferFromFile.h>
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#include <DB/IO/WriteBufferFromFile.h>
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#include <DB/IO/CompressedReadBuffer.h>
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#include <DB/IO/CompressedWriteBuffer.h>
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#include <DB/Storages/IStorage.h>
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#include <DB/DataStreams/IProfilingBlockInputStream.h>
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namespace DB
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{
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class StorageTinyLog;
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class TinyLogBlockInputStream : public IProfilingBlockInputStream
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{
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public:
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TinyLogBlockInputStream(size_t block_size_, const Names & column_names_, StorageTinyLog & storage_);
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Block readImpl();
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String getName() const { return "TinyLogBlockInputStream"; }
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BlockInputStreamPtr clone() { return new TinyLogBlockInputStream(block_size, column_names, storage); }
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private:
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size_t block_size;
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Names column_names;
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StorageTinyLog & storage;
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bool finished;
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struct Stream
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{
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Stream(const std::string & data_path)
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: plain(data_path, std::min(static_cast<size_t>(DBMS_DEFAULT_BUFFER_SIZE), Poco::File(data_path).getSize())),
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compressed(plain)
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{
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}
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ReadBufferFromFile plain;
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CompressedReadBuffer compressed;
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};
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typedef std::map<std::string, SharedPtr<Stream> > FileStreams;
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FileStreams streams;
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};
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class TinyLogBlockOutputStream : public IBlockOutputStream
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{
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public:
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TinyLogBlockOutputStream(StorageTinyLog & storage_);
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void write(const Block & block);
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BlockOutputStreamPtr clone() { return new TinyLogBlockOutputStream(storage); }
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private:
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StorageTinyLog & storage;
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struct Stream
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{
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Stream(const std::string & data_path) :
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plain(data_path, DBMS_DEFAULT_BUFFER_SIZE, O_APPEND | O_CREAT | O_WRONLY),
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compressed(plain)
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{
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}
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WriteBufferFromFile plain;
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CompressedWriteBuffer compressed;
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};
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typedef std::map<std::string, SharedPtr<Stream> > FileStreams;
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FileStreams streams;
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};
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/** Реализует хранилище, подходящее для маленьких кусочков лога.
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* Отличается от StorageLog отсутствием файлов с засечками.
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*/
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class StorageTinyLog : public IStorage
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{
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friend class TinyLogBlockInputStream;
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friend class TinyLogBlockOutputStream;
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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; создать файлы, если их нет.
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*/
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StorageTinyLog(const std::string & path_, const std::string & name_, NamesAndTypesListPtr columns_);
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std::string getName() const { return "TinyLog"; }
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std::string getTableName() const { return name; }
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const NamesAndTypesList & getColumnsList() const { 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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QueryProcessingStage::Enum & processed_stage,
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size_t max_block_size = DEFAULT_BLOCK_SIZE,
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unsigned threads = 1);
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BlockOutputStreamPtr write(
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ASTPtr query);
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void drop();
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void rename(const String & new_path_to_db, const String & new_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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/// Данные столбца
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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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Files_t files;
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};
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}
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