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// Copyright (c) 2017-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).
#include "test_agg_merge.h"
#include <assert.h>
#include <deque>
#include <vector>
#include "util/coding.h"
#include "utilities/agg_merge/agg_merge.h"
namespace ROCKSDB_NAMESPACE {
std::string EncodeHelper::EncodeFuncAndInt(const Slice& function_name,
int64_t value) {
std::string encoded_value;
PutVarsignedint64(&encoded_value, value);
std::string ret;
Status s = EncodeAggFuncAndPayload(function_name, encoded_value, ret);
assert(s.ok());
return ret;
}
std::string EncodeHelper::EncodeInt(int64_t value) {
std::string encoded_value;
PutVarsignedint64(&encoded_value, value);
return encoded_value;
}
std::string EncodeHelper::EncodeFuncAndList(const Slice& function_name,
const std::vector<Slice>& list) {
std::string ret;
Status s = EncodeAggFuncAndPayload(function_name, EncodeList(list), ret);
assert(s.ok());
return ret;
}
std::string EncodeHelper::EncodeList(const std::vector<Slice>& list) {
std::string result;
for (const Slice& entity : list) {
PutLengthPrefixedSlice(&result, entity);
}
return result;
}
bool SumAggregator::Aggregate(const std::vector<Slice>& item_list,
std::string& result) const {
int64_t sum = 0;
for (const Slice& item : item_list) {
int64_t ivalue;
Slice v = item;
if (!GetVarsignedint64(&v, &ivalue) || !v.empty()) {
return false;
}
sum += ivalue;
}
result = EncodeHelper::EncodeInt(sum);
return true;
}
bool MultipleAggregator::Aggregate(const std::vector<Slice>& item_list,
std::string& result) const {
int64_t mresult = 1;
for (const Slice& item : item_list) {
int64_t ivalue;
Slice v = item;
if (!GetVarsignedint64(&v, &ivalue) || !v.empty()) {
return false;
}
mresult *= ivalue;
}
result = EncodeHelper::EncodeInt(mresult);
return true;
}
bool Last3Aggregator::Aggregate(const std::vector<Slice>& item_list,
std::string& result) const {
std::vector<Slice> last3;
last3.reserve(3);
for (auto it = item_list.rbegin(); it != item_list.rend(); ++it) {
Slice input = *it;
Slice entity;
bool ret;
while ((ret = GetLengthPrefixedSlice(&input, &entity)) == true) {
last3.push_back(entity);
if (last3.size() >= 3) {
break;
}
}
if (last3.size() >= 3) {
break;
}
if (!ret) {
continue;
}
}
result = EncodeHelper::EncodeList(last3);
return true;
}
} // namespace ROCKSDB_NAMESPACE
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