mirror of
https://github.com/facebook/rocksdb.git
synced 2024-11-30 13:41:46 +00:00
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
87 lines
3.1 KiB
C++
87 lines
3.1 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).
|
|
//
|
|
/**
|
|
* Back-end implementation details specific to the Merge Operator.
|
|
*/
|
|
|
|
#include "rocksdb/merge_operator.h"
|
|
|
|
namespace ROCKSDB_NAMESPACE {
|
|
|
|
bool MergeOperator::FullMergeV2(const MergeOperationInput& merge_in,
|
|
MergeOperationOutput* merge_out) const {
|
|
// If FullMergeV2 is not implemented, we convert the operand_list to
|
|
// std::deque<std::string> and pass it to FullMerge
|
|
std::deque<std::string> operand_list_str;
|
|
for (auto& op : merge_in.operand_list) {
|
|
operand_list_str.emplace_back(op.data(), op.size());
|
|
}
|
|
return FullMerge(merge_in.key, merge_in.existing_value, operand_list_str,
|
|
&merge_out->new_value, merge_in.logger);
|
|
}
|
|
|
|
// The default implementation of PartialMergeMulti, which invokes
|
|
// PartialMerge multiple times internally and merges two operands at
|
|
// a time.
|
|
bool MergeOperator::PartialMergeMulti(const Slice& key,
|
|
const std::deque<Slice>& operand_list,
|
|
std::string* new_value,
|
|
Logger* logger) const {
|
|
assert(operand_list.size() >= 2);
|
|
// Simply loop through the operands
|
|
Slice temp_slice(operand_list[0]);
|
|
|
|
for (size_t i = 1; i < operand_list.size(); ++i) {
|
|
auto& operand = operand_list[i];
|
|
std::string temp_value;
|
|
if (!PartialMerge(key, temp_slice, operand, &temp_value, logger)) {
|
|
return false;
|
|
}
|
|
swap(temp_value, *new_value);
|
|
temp_slice = Slice(*new_value);
|
|
}
|
|
|
|
// The result will be in *new_value. All merges succeeded.
|
|
return true;
|
|
}
|
|
|
|
// Given a "real" merge from the library, call the user's
|
|
// associative merge function one-by-one on each of the operands.
|
|
// NOTE: It is assumed that the client's merge-operator will handle any errors.
|
|
bool AssociativeMergeOperator::FullMergeV2(
|
|
const MergeOperationInput& merge_in,
|
|
MergeOperationOutput* merge_out) const {
|
|
// Simply loop through the operands
|
|
Slice temp_existing;
|
|
const Slice* existing_value = merge_in.existing_value;
|
|
for (const auto& operand : merge_in.operand_list) {
|
|
std::string temp_value;
|
|
if (!Merge(merge_in.key, existing_value, operand, &temp_value,
|
|
merge_in.logger)) {
|
|
return false;
|
|
}
|
|
swap(temp_value, merge_out->new_value);
|
|
temp_existing = Slice(merge_out->new_value);
|
|
existing_value = &temp_existing;
|
|
}
|
|
|
|
// The result will be in *new_value. All merges succeeded.
|
|
return true;
|
|
}
|
|
|
|
// Call the user defined simple merge on the operands;
|
|
// NOTE: It is assumed that the client's merge-operator will handle any errors.
|
|
bool AssociativeMergeOperator::PartialMerge(
|
|
const Slice& key,
|
|
const Slice& left_operand,
|
|
const Slice& right_operand,
|
|
std::string* new_value,
|
|
Logger* logger) const {
|
|
return Merge(key, &left_operand, right_operand, new_value, logger);
|
|
}
|
|
|
|
} // namespace ROCKSDB_NAMESPACE
|