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50 lines
1.3 KiB
C++
50 lines
1.3 KiB
C++
#pragma once
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#include <chrono>
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#include <string>
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#include <memory>
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#include <Core/Types.h>
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namespace Poco::Util
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{
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class AbstractConfiguration;
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}
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namespace DB
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{
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/// Min and max lifetimes for a loadable object or it's entry
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struct ExternalLoadableLifetime final
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{
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UInt64 min_sec;
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UInt64 max_sec;
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ExternalLoadableLifetime(const Poco::Util::AbstractConfiguration & config, const std::string & config_prefix);
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};
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/// Basic interface for external loadable objects. Is used in ExternalLoader.
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class IExternalLoadable : public std::enable_shared_from_this<IExternalLoadable>
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{
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public:
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virtual ~IExternalLoadable() = default;
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virtual const ExternalLoadableLifetime & getLifetime() const = 0;
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virtual std::string getName() const = 0;
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/// True if object can be updated when lifetime exceeded.
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virtual bool supportUpdates() const = 0;
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/// If lifetime exceeded and isModified() ExternalLoader replace current object with the result of clone().
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virtual bool isModified() const = 0;
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/// Returns new object with the same configuration. Is used to update modified object when lifetime exceeded.
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virtual std::unique_ptr<IExternalLoadable> clone() const = 0;
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virtual std::chrono::time_point<std::chrono::system_clock> getCreationTime() const = 0;
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virtual std::exception_ptr getCreationException() const = 0;
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};
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}
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