fdf882ded2
Summary: When dynamically linking two binaries together, different builds of RocksDB from two sources might cause errors. To provide a tool for user to solve the problem, the RocksDB namespace is changed to a flag which can be overridden in build time. Pull Request resolved: https://github.com/facebook/rocksdb/pull/6433 Test Plan: Build release, all and jtest. Try to build with ROCKSDB_NAMESPACE with another flag. Differential Revision: D19977691 fbshipit-source-id: aa7f2d0972e1c31d75339ac48478f34f6cfcfb3e
40 lines
1.3 KiB
C++
40 lines
1.3 KiB
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
|
|
// This source code is licensed under both the GPLv2 (found in the
|
|
// COPYING file in the root directory) and Apache 2.0 License
|
|
// (found in the LICENSE.Apache file in the root directory).
|
|
|
|
#pragma once
|
|
|
|
#include <algorithm>
|
|
#include <memory>
|
|
#include <string>
|
|
#include "rocksdb/env.h"
|
|
#include "rocksdb/merge_operator.h"
|
|
#include "rocksdb/slice.h"
|
|
#include "util/coding.h"
|
|
#include "utilities/merge_operators.h"
|
|
|
|
namespace ROCKSDB_NAMESPACE {
|
|
|
|
// A 'model' merge operator that XORs two (same sized) array of bytes.
|
|
// Implemented as an AssociativeMergeOperator for simplicity and example.
|
|
class BytesXOROperator : public AssociativeMergeOperator {
|
|
public:
|
|
// XORs the two array of bytes one byte at a time and stores the result
|
|
// in new_value. len is the number of xored bytes, and the length of new_value
|
|
virtual bool Merge(const Slice& key,
|
|
const Slice* existing_value,
|
|
const Slice& value,
|
|
std::string* new_value,
|
|
Logger* logger) const override;
|
|
|
|
virtual const char* Name() const override {
|
|
return "BytesXOR";
|
|
}
|
|
|
|
void XOR(const Slice* existing_value, const Slice& value,
|
|
std::string* new_value) const;
|
|
};
|
|
|
|
} // namespace ROCKSDB_NAMESPACE
|