a163cc2d5a
Summary: ``` arc2 lint --everything ``` run the linter on the whole code repo to fix exisitng lint issues Test Plan: make check -j64 Reviewers: sdong, rven, anthony, kradhakrishnan, yhchiang Reviewed By: yhchiang Subscribers: dhruba, leveldb Differential Revision: https://reviews.facebook.net/D50769
113 lines
3.1 KiB
C++
113 lines
3.1 KiB
C++
/**
|
|
* @author Deon Nicholas (dnicholas@fb.com)
|
|
* Copyright 2013 Facebook
|
|
*/
|
|
|
|
#include "stringappend2.h"
|
|
|
|
#include <memory>
|
|
#include <string>
|
|
#include <assert.h>
|
|
|
|
#include "rocksdb/slice.h"
|
|
#include "rocksdb/merge_operator.h"
|
|
#include "utilities/merge_operators.h"
|
|
|
|
namespace rocksdb {
|
|
|
|
// Constructor: also specify the delimiter character.
|
|
StringAppendTESTOperator::StringAppendTESTOperator(char delim_char)
|
|
: delim_(delim_char) {
|
|
}
|
|
|
|
// Implementation for the merge operation (concatenates two strings)
|
|
bool StringAppendTESTOperator::FullMerge(
|
|
const Slice& key,
|
|
const Slice* existing_value,
|
|
const std::deque<std::string>& operands,
|
|
std::string* new_value,
|
|
Logger* logger) const {
|
|
|
|
// Clear the *new_value for writing.
|
|
assert(new_value);
|
|
new_value->clear();
|
|
|
|
// Compute the space needed for the final result.
|
|
size_t numBytes = 0;
|
|
for(auto it = operands.begin(); it != operands.end(); ++it) {
|
|
numBytes += it->size() + 1; // Plus 1 for the delimiter
|
|
}
|
|
|
|
// Only print the delimiter after the first entry has been printed
|
|
bool printDelim = false;
|
|
|
|
// Prepend the *existing_value if one exists.
|
|
if (existing_value) {
|
|
new_value->reserve(numBytes + existing_value->size());
|
|
new_value->append(existing_value->data(), existing_value->size());
|
|
printDelim = true;
|
|
} else if (numBytes) {
|
|
new_value->reserve(numBytes-1); // Minus 1 since we have one less delimiter
|
|
}
|
|
|
|
// Concatenate the sequence of strings (and add a delimiter between each)
|
|
for(auto it = operands.begin(); it != operands.end(); ++it) {
|
|
if (printDelim) {
|
|
new_value->append(1,delim_);
|
|
}
|
|
new_value->append(*it);
|
|
printDelim = true;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
bool StringAppendTESTOperator::PartialMergeMulti(
|
|
const Slice& key, const std::deque<Slice>& operand_list,
|
|
std::string* new_value, Logger* logger) const {
|
|
return false;
|
|
}
|
|
|
|
// A version of PartialMerge that actually performs "partial merging".
|
|
// Use this to simulate the exact behaviour of the StringAppendOperator.
|
|
bool StringAppendTESTOperator::_AssocPartialMergeMulti(
|
|
const Slice& key, const std::deque<Slice>& operand_list,
|
|
std::string* new_value, Logger* logger) const {
|
|
// Clear the *new_value for writing
|
|
assert(new_value);
|
|
new_value->clear();
|
|
assert(operand_list.size() >= 2);
|
|
|
|
// Generic append
|
|
// Determine and reserve correct size for *new_value.
|
|
size_t size = 0;
|
|
for (const auto& operand : operand_list) {
|
|
size += operand.size();
|
|
}
|
|
size += operand_list.size() - 1; // Delimiters
|
|
new_value->reserve(size);
|
|
|
|
// Apply concatenation
|
|
new_value->assign(operand_list.front().data(), operand_list.front().size());
|
|
|
|
for (std::deque<Slice>::const_iterator it = operand_list.begin() + 1;
|
|
it != operand_list.end(); ++it) {
|
|
new_value->append(1, delim_);
|
|
new_value->append(it->data(), it->size());
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
const char* StringAppendTESTOperator::Name() const {
|
|
return "StringAppendTESTOperator";
|
|
}
|
|
|
|
|
|
std::shared_ptr<MergeOperator>
|
|
MergeOperators::CreateStringAppendTESTOperator() {
|
|
return std::make_shared<StringAppendTESTOperator>(',');
|
|
}
|
|
|
|
} // namespace rocksdb
|