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64 lines
2.2 KiB
C++
64 lines
2.2 KiB
C++
//------------------------------------------------------------------------------
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/*
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This file is part of rippled: https://github.com/ripple/rippled
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Copyright (c) 2012, 2013 Ripple Labs Inc.
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Permission to use, copy, modify, and/or distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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ANY SPECIAL , DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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//==============================================================================
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#ifndef RIPPLE_NODESTORE_DATABASEROTATING_H_INCLUDED
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#define RIPPLE_NODESTORE_DATABASEROTATING_H_INCLUDED
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#include <xrpl/nodestore/Database.h>
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namespace ripple {
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namespace 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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/** Rotates the backends.
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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(
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std::string const& writableName,
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std::string const& archiveName)> const& f) = 0;
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};
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} // namespace NodeStore
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} // namespace ripple
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#endif
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