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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
namespace search { class BufferWriter; }
namespace search::tensor {
/**
* Interface that is used to save a nearest neighbor index to binary form.
*
* An instance of this interface must hold a snapshot of the index from the
* point in time the instance was created, and then save this to binary form in the save() function.
*
* The instance is always created by the attribute write thread,
* and the caller ensures that an attribute read guard is held during the lifetime of the saver.
* Data that might change later must be copied in the constructor.
*
* A flush thread is calling save() at a later point in time.
*/
class NearestNeighborIndexSaver {
public:
virtual ~NearestNeighborIndexSaver() {}
/**
* Saves the index in binary form using the given writer.
*
* It is the responsibility of the implementer to call BufferWriter::flush() at the end.
*/
virtual void save(BufferWriter& writer) const = 0;
};
}
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