01f93ffe
 Steven de Ridder
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/* ****************************************************************************
* Copyright 2019 Open Systems Development BV *
* *
* Permission is hereby granted, free of charge, to any person obtaining a *
* copy of this software and associated documentation files (the "Software"), *
* to deal in the Software without restriction, including without limitation *
* the rights to use, copy, modify, merge, publish, distribute, sublicense, *
* and/or sell copies of the Software, and to permit persons to whom the *
* Software is furnished to do so, subject to the following conditions: *
* *
* The above copyright notice and this permission notice shall be included in *
* all copies or substantial portions of the Software. *
* *
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR *
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, *
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL *
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER *
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING *
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER *
* DEALINGS IN THE SOFTWARE. *
* ***************************************************************************/
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5251bf3a
Steven de Ridder
Initial commit. d...
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#ifndef OSDEV_COMPONENTS_TIMELINE_H
#define OSDEV_COMPONENTS_TIMELINE_H
// boost
#include <boost/circular_buffer.hpp>
#include "ormbatchchange.h"
namespace osdev {
namespace components {
/**
* @brief The timeline contains the changes that where made to a specific Batch/Merge update table.
* Only a small number of changes is recorded. A change arrives that is older then the oldest recorded
* change this change will not be considered.
*/
class Timeline
{
public:
/**
* @brief Creates an empty timeline.
*/
Timeline();
// Non copyable, non movable.
Timeline(const Timeline&) = delete;
Timeline& operator=(const Timeline&) = delete;
Timeline(Timeline&&) = delete;
Timeline& operator=(Timeline&&) = delete;
/**
* @brief Evaluate an incoming change against the already registered changes.
* A previously evaluated change is discarded.
* @param desiredChange The incoming change.
* @param exclusiveUpdate Flag that indicates if this change should be evaluated in an exclusive manner.
* @return The reshaped and possibly invalidated change that is left.
* @note The evaluated change is cached so that it can be commited if the database update actually succeeds.
*/
const OrmBatchChange& evaluate(const OrmBatchChange& desiredChange, bool exclusiveUpdate);
/**
* @brief Commit an evaluated change.
* Only valid proposals are commited. This method should be called when the change
* is sucessfuly written to the database.
* @note To make this somewhat trustworthy the underlying database should support transactions.
*/
void commit();
private:
boost::circular_buffer<OrmBatchChange> m_timeline; ///< Only a small number of changes are buffered.
OrmBatchChange m_proposedChange; ///< Cache the evaluated proposed change for commiting.
};
} /* End namespace components */
} /* End namespace osdev */
#endif /* OSDEV_COMPONENTS_TIMELINE_H */
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