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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <memory>
namespace vespalib { class DataBuffer; }
namespace search {
class BufferWriter;
/*
* Interface class to write to a single attribute vector file. Used by
* IAttributSaver.
*/
class IAttributeFileWriter
{
public:
using BufferBuf = vespalib::DataBuffer;
using Buffer = std::unique_ptr<BufferBuf>;
virtual ~IAttributeFileWriter() = default;
/*
* Allocate a buffer that can later be passed on to writeBuf.
*/
virtual Buffer allocBuf(size_t size) = 0;
/**
* Writes the given data. Multiple calls are allowed, but only the
* last call can provide an unaligned buffer.
**/
virtual void writeBuf(Buffer buf) = 0;
virtual std::unique_ptr<BufferWriter> allocBufferWriter() = 0;
};
} // namespace search
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