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60 lines
1.7 KiB
C++
60 lines
1.7 KiB
C++
#pragma once
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#include <mutex>
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#include <ext/shared_ptr_helper.h>
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#include <Core/NamesAndTypes.h>
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#include <Storages/IStorage.h>
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#include <DataStreams/IBlockOutputStream.h>
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namespace DB
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{
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/** Implements storage in the RAM.
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* Suitable for temporary data.
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* It does not support keys.
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* Data is stored as a set of blocks and is not stored anywhere else.
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*/
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class StorageMemory final : public ext::shared_ptr_helper<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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friend struct ext::shared_ptr_helper<StorageMemory>;
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public:
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String getName() const override { return "Memory"; }
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size_t getSize() const { return data.size(); }
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Pipes read(
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const Names & column_names,
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const StorageMetadataPtr & /*metadata_snapshot*/,
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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 StorageMetadataPtr & /*metadata_snapshot*/, const Context & context) override;
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void drop() override;
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void truncate(const ASTPtr &, const Context &, TableStructureWriteLockHolder &) override;
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std::optional<UInt64> totalRows() const override;
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std::optional<UInt64> totalBytes() const override;
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private:
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/// The data itself. `list` - so that when inserted to the end, the existing iterators are not invalidated.
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BlocksList data;
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mutable std::mutex mutex;
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protected:
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StorageMemory(const StorageID & table_id_, ColumnsDescription columns_description_, ConstraintsDescription constraints_);
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};
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}
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