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/**
* Copyright (c) 2019 DENSO CORPORATION.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* Rollbacker (rollback of arbitration results) class header
*/
#ifndef RBARROLLBACKER_HPP
#define RBARROLLBACKER_HPP
#include <unordered_map>
#include <memory>
#include <list>
namespace rba
{
class RBAModel;
class RBAAllocatable;
class RBAArbitratorImpl;
class RBARollbacker
{
public:
RBARollbacker()=default;
RBARollbacker(const RBARollbacker&)=delete;
RBARollbacker(const RBARollbacker&&)=delete;
RBARollbacker& operator=(const RBARollbacker&)=delete;
RBARollbacker& operator=(const RBARollbacker&&)=delete;
virtual ~RBARollbacker() noexcept;
/**
* Register a backup for child re-arbitration when execute re-arbitration
* during re-arbitration.
* Restore child backup when rolling back
*/
void addChild(const std::shared_ptr<RBARollbacker> child);
void removeChild(const std::shared_ptr<RBARollbacker> child);
/**
* Back up arbitration status and impact information.
* (Only "Allocatable" that directly arbitration is backed up)
* Child will back up re-arbitraion during execution of re-aribitration.
*
* Backing up all "Allocatable" on a model is inefficient,
* so back up only those that execute re-arbitration
*/
void backup(std::list<const RBAAllocatable*>& backuplist);
/**
* Roll back the arbitration state and impact information to
* the state when the instance was created
*/
void rollback();
private:
/**
* @brief Copy Allocable arbitration state
* @param from source of copy
* @param to destination of copy
*/
void copyAllocatable(const RBAAllocatable* const from, RBAAllocatable* const to);
std::list<std::shared_ptr<RBARollbacker>> children_;
// Rollback information when arbitration fails
std::unordered_map<const RBAAllocatable*, std::unique_ptr<RBAAllocatable>> backupMap_;
};
}
#endif
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