src/app/persistence/AttributePersistenceProvider.h

/*
 *    Copyright (c) 2021-2025 Project CHIP Authors
 *
 *    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.
 */
#pragma once

#include <app/ConcreteAttributePath.h>
#include <lib/support/Span.h>

namespace chip {
namespace app {

/**
 * Interface for persisting attribute values.
 *
 * COMPATIBILITY NOTE:
 *   - This generally is assumed to write under a different key space from
 *     SafeAttributePersistenceProvider.
 */
class AttributePersistenceProvider
{
public:
    virtual ~AttributePersistenceProvider() = default;
    AttributePersistenceProvider()          = default;

    /**
     * Write an attribute value from the attribute store (i.e. not a struct or
     * list) to non-volatile memory.
     *
     * @param [in] aPath the attribute path for the data being written.
     * @param [in] aValue the data to write.
     */
    virtual CHIP_ERROR WriteValue(const ConcreteAttributePath & aPath, const ByteSpan & aValue) = 0;

    /**
     * Read an attribute value from non-volatile memory.
     *
     * @param [in]     aPath the attribute path for the data being persisted.
     * @param [in,out] aValue where to place the data.
     */
    virtual CHIP_ERROR ReadValue(const ConcreteAttributePath & aPath, MutableByteSpan & aValue) = 0;
};

} // namespace app
} // namespace chip