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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <vespa/vespalib/util/compressionconfig.h>
#include <vespa/vespalib/data/databuffer.h>
namespace search::docstore {
/**
* This class is used to represent a serialized and optionally compressed blob.
* Has efficient move/copy operators for use in a cache/stl containers.
* Also has crc checks of uncompressed data.
*/
class Value {
public:
using Alloc = vespalib::alloc::Alloc;
using CompressionConfig = vespalib::compression::CompressionConfig;
using Result = std::pair<vespalib::DataBuffer, bool>;
Value();
Value(uint64_t syncToken);
Value(Value &&rhs) = default;
Value &operator=(Value &&rhs) = default;
Value(const Value &rhs);
~Value();
uint64_t getSyncToken() const { return _syncToken; }
CompressionConfig::Type getCompression() const { return _compression; }
size_t getUncompressedSize() const { return _uncompressedSize; }
/**
* Compress buffer into temporary buffer and copy temporary buffer to
* value along with compression config.
*/
void set(vespalib::DataBuffer &&buf, ssize_t len, CompressionConfig compression);
// Keep buffer uncompressed
void set(vespalib::DataBuffer &&buf, ssize_t len);
Result decompressed() const;
size_t size() const { return _compressedSize; }
size_t capacity() const { return _buf ? _buf->size() : 0; }
bool empty() const { return size() == 0; }
operator const void *() const { return get(); }
const void *get() const;
private:
uint64_t _syncToken;
uint64_t _uncompressedCrc;
uint32_t _compressedSize;
uint32_t _uncompressedSize;
std::shared_ptr<Alloc> _buf;
CompressionConfig::Type _compression;
};
}
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