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60 lines
1.7 KiB
C++
60 lines
1.7 KiB
C++
#pragma once
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#include <xrpl/beast/utility/Journal.h>
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#include <xrpl/nodestore/Backend.h>
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#include <xrpl/nodestore/Database.h>
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#include <xrpl/nodestore/Scheduler.h>
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#include <functional>
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#include <memory>
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#include <string>
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namespace xrpl::NodeStore {
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/* This class has two key-value store Backend objects for persisting SHAMap
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* records. This facilitates online deletion of data. New backends are
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* rotated in. Old ones are rotated out and deleted.
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*/
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class DatabaseRotating : public Database
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{
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public:
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DatabaseRotating(
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Scheduler& scheduler,
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int readThreads,
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Section const& config,
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beast::Journal journal)
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: Database(scheduler, readThreads, config, journal)
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{
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}
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/**
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* Rotates the backends.
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*
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* @param newBackend New writable backend
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* @param f A function executed after the rotation outside of lock. The
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* values passed to f will be the new backend database names _after_
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* rotation.
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*/
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virtual void
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rotate(
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std::unique_ptr<NodeStore::Backend>&& newBackend,
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std::function<void(std::string const& writableName, std::string const& archiveName)> const&
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f) = 0;
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/**
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* Marks an online-delete rotation as in progress (or completed).
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*
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* While in flight, a read served by the archive backend is copied
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* forward into the writable backend even for ordinary
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* (duplicate == false) fetches: the archive is about to be deleted,
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* and a node body canonicalized into caches during the rotation
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* window would otherwise survive only in RAM once the archive is
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* dropped.
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*/
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virtual void
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setRotationInFlight(bool inFlight) = 0;
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};
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} // namespace xrpl::NodeStore
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