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/*************************************************************************************************
* Example of access counter using a lambda processor
*
* Copyright 2020 Google LLC
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of the License at
* https://www.apache.org/licenses/LICENSE-2.0
* Unless required by applicable law or agreed to in writing, software distributed under the
* License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
* either express or implied. See the License for the specific language governing permissions
* and limitations under the License.
*************************************************************************************************/
#include "tkrzw_dbm_hash.h"
#include "tkrzw_str_util.h"
using namespace tkrzw;
int64_t CountUp(DBM* dbm, std::string id) {
int64_t count = 0;
std::string new_value;
dbm->Process(id,
[&](std::string_view key, std::string_view value) -> std::string_view {
if (value.data() == DBM::RecordProcessor::NOOP.data()) {
count = 1;
return "1";
}
count = StrToInt(value) + 1;
new_value = ToString(count);
return new_value;
}, true).OrDie();
return count;
}
void MultiplyEach(DBM* dbm, double factor) {
std::string new_value;
dbm->ProcessEach(
[&](std::string_view key, std::string_view value) -> std::string_view {
if (value.data() == DBM::RecordProcessor::NOOP.data()) {
return DBM::RecordProcessor::NOOP;
}
const int64_t count = static_cast<int64_t>(StrToInt(value) * factor);
if (count < 1) {
return DBM::RecordProcessor::REMOVE;
}
new_value = ToString(count);
return new_value;
}, true).OrDie();
}
int main(int argc, char** argv) {
HashDBM dbm;
dbm.Open("casket.tkh", true, File::OPEN_TRUNCATE).OrDie();
std::cout << CountUp(&dbm, "apple") << std::endl;
std::cout << CountUp(&dbm, "apple") << std::endl;
std::cout << CountUp(&dbm, "banana") << std::endl;
std::cout << CountUp(&dbm, "apple") << std::endl;
std::cout << CountUp(&dbm, "banana") << std::endl;
MultiplyEach(&dbm, 0.35);
std::cout << "apple: " << dbm.GetSimple("apple", "*") << std::endl;
std::cout << "banana: " << dbm.GetSimple("banana", "*") << std::endl;
dbm.Close().OrDie();
return 0;
}
// END OF FILE
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