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101 lines
2.5 KiB
C++
101 lines
2.5 KiB
C++
#pragma once
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#include <Poco/Mutex.h>
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#include <DB/Core/NamesAndTypes.h>
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#include <DB/Storages/IStorage.h>
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#include <DB/DataStreams/IProfilingBlockInputStream.h>
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#include <DB/DataStreams/IBlockOutputStream.h>
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namespace DB
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{
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class StorageMemory;
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class MemoryBlockInputStream : public IProfilingBlockInputStream
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{
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public:
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MemoryBlockInputStream(const Names & column_names_, BlocksList::iterator begin_, BlocksList::iterator end_);
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String getName() const { return "MemoryBlockInputStream"; }
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String getID() const
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{
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std::stringstream res;
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res << "Memory(" << &*begin << ", " << &*end;
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for (size_t i = 0; i < column_names.size(); ++i)
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res << ", " << column_names[i];
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res << ")";
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return res.str();
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}
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protected:
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Block readImpl();
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private:
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Names column_names;
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BlocksList::iterator begin;
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BlocksList::iterator end;
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BlocksList::iterator it;
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};
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class MemoryBlockOutputStream : public IBlockOutputStream
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{
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public:
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MemoryBlockOutputStream(StorageMemory & storage_);
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void write(const Block & block);
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private:
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StorageMemory & storage;
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};
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/** Реализует хранилище в оперативке.
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* Подходит для временных данных.
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* В нём не поддерживаются ключи.
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* Данные хранятся в виде набора блоков и никуда дополнительно не сохраняются.
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*/
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class StorageMemory : public IStorage
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{
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friend class MemoryBlockInputStream;
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friend class MemoryBlockOutputStream;
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public:
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static StoragePtr create(const std::string & name_, NamesAndTypesListPtr columns_);
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std::string getName() const { return "Memory"; }
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std::string getTableName() const { return name; }
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const NamesAndTypesList & getColumnsList() const { return *columns; }
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size_t getSize() const { return data.size(); }
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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 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);
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BlockOutputStreamPtr write(
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ASTPtr query);
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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) { name = new_table_name; }
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private:
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String name;
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NamesAndTypesListPtr columns;
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/// Сами данные. list - чтобы при вставке в конец, существующие итераторы не инвалидировались.
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BlocksList data;
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Poco::FastMutex mutex;
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StorageMemory(const std::string & name_, NamesAndTypesListPtr columns_);
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};
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}
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