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#pragma once
#include <Poco/AutoPtr.h>
#include <Poco/Util/AbstractConfiguration.h>
#include <Poco/Timestamp.h>
#include <atomic>
#include <memory>
#include <string>
#include <set>
namespace DB
{
using LoadablesConfigurationPtr = Poco::AutoPtr<Poco::Util::AbstractConfiguration>;
/// Base interface for configurations source for Loadble objects, which can be
/// loaded with ExternalLoader. Configurations may came from filesystem (XML-files),
/// server memory (from database), etc. It's important that main result of this class
/// (LoadablesConfigurationPtr) may contain more than one loadable config,
/// each one with own key, which can be obtained with keys method,
/// for example multiple dictionaries can be defined in single .xml file.
class IExternalLoaderConfigRepository
{
public:
/// Returns the name of the repository.
virtual std::string getName() const = 0;
/// Whether this repository is temporary:
/// it's created and destroyed while executing the same query.
virtual bool isTemporary() const { return false; }
/// Return all available sources of loadables structure
/// (all .xml files from fs, all entities from database, etc)
virtual std::set<std::string> getAllLoadablesDefinitionNames() = 0;
/// Checks that source of loadables configuration exist.
virtual bool exists(const std::string & path) = 0;
/// Returns entity last update time
virtual Poco::Timestamp getUpdateTime(const std::string & path) = 0;
/// Load configuration from some concrete source to AbstractConfiguration
virtual LoadablesConfigurationPtr load(const std::string & path) = 0;
virtual ~IExternalLoaderConfigRepository() = default;
};
}
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