mirror of
https://github.com/facebook/react-native.git
synced 2025-11-01 09:14:26 +00:00
Andrei Shikov
d287598d23
Summary: Removes the need to store keys in incremental order by sorting them after before inserting into MapBuffer. Updates MapBuffer to support random access on C++ side, actually retrieving values by keys and not bucket index. Changelog: [Internal] Reviewed By: mdvacca Differential Revision: D33611758 fbshipit-source-id: c81e970613c8ecc688bfacb29ba038bf081a0c0f
81 lines
2.1 KiB
C++
81 lines
2.1 KiB
C++
/*
|
|
* Copyright (c) Meta Platforms, Inc. and affiliates.
|
|
*
|
|
* This source code is licensed under the MIT license found in the
|
|
* LICENSE file in the root directory of this source tree.
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <react/debug/react_native_assert.h>
|
|
#include <react/renderer/mapbuffer/primitives.h>
|
|
|
|
#include <limits>
|
|
|
|
namespace facebook {
|
|
namespace react {
|
|
|
|
class ReadableMapBuffer;
|
|
|
|
/**
|
|
* MapBuffer is an optimized map format for transferring data like props between
|
|
* C++ and other platforms The implementation of this map is optimized to:
|
|
* - be compact to optimize space when sparse (sparse is the common case).
|
|
* - be accessible through JNI with zero/minimal copying via ByteBuffer.
|
|
* - be Have excellent C++ single-write and many-read performance by maximizing
|
|
* CPU cache performance through compactness, data locality, and fixed offsets
|
|
* where possible.
|
|
* - be optimized for iteration and intersection against other maps, but with
|
|
* reasonably good random access as well.
|
|
* - Work recursively for nested maps/arrays.
|
|
* - Supports dynamic types that map to JSON.
|
|
* - Don't require mutability - single-write on creation.
|
|
* - have minimal APK size and build time impact.
|
|
*/
|
|
class MapBuffer {
|
|
friend ReadableMapBuffer;
|
|
|
|
private:
|
|
// Buffer and its size
|
|
std::vector<uint8_t> const bytes_;
|
|
|
|
// amount of items in the MapBuffer
|
|
uint16_t count_ = 0;
|
|
|
|
// returns the relative offset of the first byte of dynamic data
|
|
int32_t getDynamicDataOffset() const;
|
|
|
|
uint32_t getKeyBucket(Key key) const;
|
|
|
|
public:
|
|
explicit MapBuffer(std::vector<uint8_t> data);
|
|
|
|
MapBuffer(MapBuffer const &buffer) = delete;
|
|
|
|
MapBuffer &operator=(MapBuffer other) = delete;
|
|
|
|
MapBuffer(MapBuffer &&buffer) = default;
|
|
|
|
int32_t getInt(Key key) const;
|
|
|
|
bool getBool(Key key) const;
|
|
|
|
double getDouble(Key key) const;
|
|
|
|
std::string getString(Key key) const;
|
|
|
|
// TODO T83483191: review this declaration
|
|
MapBuffer getMapBuffer(Key key) const;
|
|
|
|
bool isNull(Key key) const;
|
|
|
|
uint32_t size() const;
|
|
|
|
uint8_t const *data() const;
|
|
|
|
uint16_t count() const;
|
|
};
|
|
|
|
} // namespace react
|
|
} // namespace facebook
|