DatabaseRotating.h

#pragma once
 
#include <xrpl/beast/utility/Journal.h>
#include <xrpl/nodestore/Backend.h>
#include <xrpl/nodestore/Database.h>
#include <xrpl/nodestore/Scheduler.h>
 
#include <functional>
#include <memory>
#include <string>
 
namespace xrpl::node_store {
 
/* This class has two key-value store Backend objects for persisting SHAMap
 * records. This facilitates online deletion of data. New backends are
 * rotated in. Old ones are rotated out and deleted.
 */
 
class DatabaseRotating : public Database
{
public:
    DatabaseRotating(
        Scheduler& scheduler,
        int readThreads,
        Section const& config,
        beast::Journal journal)
        : Database(scheduler, readThreads, config, journal)
    {
    }

    virtual void
    rotate(
        std::unique_ptr<node_store::Backend>&& newBackend,
        std::function<void(std::string const& writableName, std::string const& archiveName)> const&
            f) = 0;

    virtual void
    setRotationInFlight(bool inFlight) = 0;
};
 
}  // namespace xrpl::node_store