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#pragma once
#include <base/types.h>
namespace DB
{
class IAST;
struct Settings;
enum class UserDefinedSQLObjectType;
/// Interface for a loader of user-defined SQL objects.
/// Implementations: UserDefinedSQLLoaderFromDisk, UserDefinedSQLLoaderFromZooKeeper
class IUserDefinedSQLObjectsLoader
{
public:
virtual ~IUserDefinedSQLObjectsLoader() = default;
/// Whether this loader can replicate SQL objects to another node.
virtual bool isReplicated() const { return false; }
virtual String getReplicationID() const { return ""; }
/// Loads all objects. Can be called once - if objects are already loaded the function does nothing.
virtual void loadObjects() = 0;
/// Stops watching.
virtual void stopWatching() {}
/// Immediately reloads all objects, throws an exception if failed.
virtual void reloadObjects() = 0;
/// Immediately reloads a specified object only.
virtual void reloadObject(UserDefinedSQLObjectType object_type, const String & object_name) = 0;
/// Stores an object (must be called only by UserDefinedSQLFunctionFactory::registerFunction).
virtual bool storeObject(
UserDefinedSQLObjectType object_type,
const String & object_name,
const IAST & create_object_query,
bool throw_if_exists,
bool replace_if_exists,
const Settings & settings) = 0;
/// Removes an object (must be called only by UserDefinedSQLFunctionFactory::unregisterFunction).
virtual bool removeObject(UserDefinedSQLObjectType object_type, const String & object_name, bool throw_if_not_exists) = 0;
};
}
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