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69 lines
1.9 KiB
C++
69 lines
1.9 KiB
C++
#pragma once
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#include "config.h"
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#if USE_HDFS
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#include <mutex>
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#include <Databases/IDatabase.h>
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#include <Parsers/IAST.h>
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#include <Storages/IStorage_fwd.h>
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#include <base/types.h>
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namespace DB
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{
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class Context;
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/**
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* DatabaseHDFS allows to interact with files stored on the file system.
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* Uses TableFunctionHDFS to implicitly load file when a user requests the table,
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* and provides read-only access to the data in the file.
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* Tables are cached inside the database for quick access.
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*/
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class DatabaseHDFS : public IDatabase, protected WithContext
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{
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public:
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DatabaseHDFS(const String & name, const String & source_url, ContextPtr context);
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String getEngineName() const override { return "S3"; }
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bool isTableExist(const String & name, ContextPtr context) const override;
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StoragePtr getTable(const String & name, ContextPtr context) const override;
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StoragePtr tryGetTable(const String & name, ContextPtr context) const override;
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bool shouldBeEmptyOnDetach() const override { return false; } /// Contains only temporary tables.
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bool empty() const override;
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bool isReadOnly() const override { return true; }
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ASTPtr getCreateDatabaseQuery() const override;
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void shutdown() override;
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std::vector<std::pair<ASTPtr, StoragePtr>> getTablesForBackup(const FilterByNameFunction &, const ContextPtr &) const override;
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DatabaseTablesIteratorPtr getTablesIterator(ContextPtr, const FilterByNameFunction &) const override;
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protected:
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StoragePtr getTableImpl(const String & name, ContextPtr context) const;
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void addTable(const std::string & table_name, StoragePtr table_storage) const;
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bool checkUrl(const std::string & url, ContextPtr context_, bool throw_on_error) const;
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std::string getTablePath(const std::string & table_name) const;
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private:
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const String source;
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mutable Tables loaded_tables TSA_GUARDED_BY(mutex);
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Poco::Logger * log;
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};
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}
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#endif
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