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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <memory>
namespace proton {
class DocumentSubDBReconfig;
/**
* Class representing the result of the prepare step of a DocumentDB reconfig.
*
* The reconfig is performed in three steps:
* Prepare:
* Based on the config that is changed, new components are instantiated in each subdb.
* This can be costly and is handled by helper threads from the shared executor pool.
*
* Complete prepare:
* Docid limit and serial number are used to complete prepared reconfig.
*
* Apply:
* The new components are swapped with the old ones in the DocumentDB master write thread.
*/
class DocumentDBReconfig {
private:
std::unique_ptr<DocumentSubDBReconfig> _ready_reconfig;
std::unique_ptr<DocumentSubDBReconfig> _not_ready_reconfig;
public:
DocumentDBReconfig(std::unique_ptr<DocumentSubDBReconfig> ready_reconfig_in,
std::unique_ptr<DocumentSubDBReconfig> not_ready_reconfig_in);
~DocumentDBReconfig();
const DocumentSubDBReconfig& ready_reconfig() const noexcept { return *_ready_reconfig; }
DocumentSubDBReconfig& ready_reconfig() noexcept { return *_ready_reconfig; }
const DocumentSubDBReconfig& not_ready_reconfig() const noexcept { return *_not_ready_reconfig; }
DocumentSubDBReconfig& not_ready_reconfig() noexcept { return *_not_ready_reconfig; }
};
}
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