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DiskMemory.h
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DiskMemory.h
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#pragma once
#include <memory>
#include <mutex>
#include <unordered_map>
#include <utility>
#include <Disks/IDisk.h>
namespace DB
{
class DiskMemory;
class ReadBufferFromFileBase;
class WriteBufferFromFileBase;
/** Implementation of Disk intended only for testing purposes.
* All filesystem objects are stored in memory and lost on server restart.
*
* NOTE Work in progress. Currently the interface is not viable enough to support MergeTree or even StripeLog tables.
* Please delete this interface if it will not be finished after 2020-06-18.
*/
class DiskMemory : public IDisk
{
public:
explicit DiskMemory(const String & name_) : name(name_), disk_path("memory://" + name_ + '/') {}
const String & getName() const override { return name; }
const String & getPath() const override { return disk_path; }
ReservationPtr reserve(UInt64 bytes) override;
UInt64 getTotalSpace() const override;
UInt64 getAvailableSpace() const override;
UInt64 getUnreservedSpace() const override;
bool exists(const String & path) const override;
bool isFile(const String & path) const override;
bool isDirectory(const String & path) const override;
size_t getFileSize(const String & path) const override;
void createDirectory(const String & path) override;
void createDirectories(const String & path) override;
void clearDirectory(const String & path) override;
void moveDirectory(const String & from_path, const String & to_path) override;
DiskDirectoryIteratorPtr iterateDirectory(const String & path) override;
void createFile(const String & path) override;
void moveFile(const String & from_path, const String & to_path) override;
void replaceFile(const String & from_path, const String & to_path) override;
void listFiles(const String & path, std::vector<String> & file_names) override;
std::unique_ptr<ReadBufferFromFileBase> readFile(
const String & path,
const ReadSettings & settings,
std::optional<size_t> read_hint,
std::optional<size_t> file_size) const override;
std::unique_ptr<WriteBufferFromFileBase> writeFile(
const String & path,
size_t buf_size,
WriteMode mode) override;
void removeFile(const String & path) override;
void removeFileIfExists(const String & path) override;
void removeDirectory(const String & path) override;
void removeRecursive(const String & path) override;
void setLastModified(const String &, const Poco::Timestamp &) override {}
Poco::Timestamp getLastModified(const String &) override { return Poco::Timestamp(); }
void setReadOnly(const String & path) override;
void createHardLink(const String & src_path, const String & dst_path) override;
void truncateFile(const String & path, size_t size) override;
DiskType getType() const override { return DiskType::RAM; }
bool isRemote() const override { return false; }
bool supportZeroCopyReplication() const override { return false; }
private:
void createDirectoriesImpl(const String & path);
void replaceFileImpl(const String & from_path, const String & to_path);
friend class WriteIndirectBuffer;
enum class FileType
{
File,
Directory
};
struct FileData
{
FileType type;
String data;
FileData(FileType type_, String data_) : type(type_), data(std::move(data_)) {}
explicit FileData(FileType type_) : type(type_) {}
};
using Files = std::unordered_map<String, FileData>; /// file path -> file data
const String name;
const String disk_path;
Files files;
mutable std::mutex mutex;
};
}