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135 řádky
3.2 KiB
135 řádky
3.2 KiB
#include "leveldb/db.h"
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#include "leveldb/filter_policy.h"
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#include "leveldb/env.h"
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#include "leveldb/db.h"
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using namespace leveldb;
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constexpr int value_size = 2048;
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constexpr int data_size = 128 << 20;
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#include <iostream>
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#include <cstdlib>
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#include <ctime>
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using namespace leveldb;
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// 3. 数据管理（Manifest/创建/恢复数据库）
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Status OpenDB(std::string dbName, DB **db) {
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Options options;
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options.create_if_missing = true;
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options.filter_policy = NewBloomFilterPolicy(10);
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return DB::Open(options, dbName, db);
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}
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// 1. 存储（数据结构与写入）
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// 4. 数据合并（Compaction）
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//void InsertData(DB *db) {
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// WriteOptions writeOptions;
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// int key_num = data_size / value_size;
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// srand(static_cast<unsigned int>(time(0)));
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//
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// for (int i = 0; i < key_num; i++) {
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// int key_ = rand() % key_num+1;
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// std::string key = std::to_string(key_);
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// std::string value(value_size, 'a');
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// db->Put(writeOptions, key, value);
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// }
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//}
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//void InsertData(DB *db, uint64_t ttl/* second */) {
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// WriteOptions writeOptions;
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// int key_num = data_size / value_size;
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// srand(static_cast<unsigned int>(time(0)));
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// for (int i = 0; i < key_num; i++) {
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// int key_ = rand() % key_num+1;
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// key_ = 1;
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// std::string key = std::to_string(key_);
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// std::string value(value_size, 'a');
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// db->Put(writeOptions, key, value, ttl);
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// std::cout << "time to alive" << ttl << std::endl;
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// break;
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// }
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//}
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void InsertData(DB *db, uint64_t ttl/* second */) {
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WriteOptions writeOptions;
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int key_num = data_size / value_size;
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srand(0);
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for (int i = 0; i < key_num; i++) {
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int key_ = rand() % key_num+1;
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std::string key = std::to_string(key_);
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std::string value(value_size, 'a');
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db->Put(writeOptions, key, value, ttl);
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//break;
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}
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}
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//int main(){
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// DB *db;
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//
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// if(OpenDB("testdb", &db).ok() == false) {
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// std::cerr << "open db failed" << std::endl;
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// abort();
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// }
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//
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// uint64_t ttl = 20;
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// InsertData(db, ttl);
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//
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// leveldb::Range ranges[1];
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// ranges[0] = leveldb::Range("-", "A");
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// uint64_t sizes[1];
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// db->GetApproximateSizes(ranges, 1, sizes);
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// //ASSERT_GT(sizes[0], 0);
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// assert(sizes[0] > 0);
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// Env::Default()->SleepForMicroseconds(ttl * 1000000);
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//
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// db->CompactRange(nullptr, nullptr);
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//
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// leveldb::Range ranges2[1];
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// ranges2[0] = leveldb::Range("-", "A");
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// uint64_t sizes2[1];
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// db->GetApproximateSizes(ranges2, 1, sizes2);
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// assert(sizes2[0] == 0);
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//}
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int main() {
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DB *db;
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if(OpenDB("testdb", &db).ok() == false) {
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std::cerr << "open db failed" << std::endl;
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abort();
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}
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uint64_t ttl = 20;
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// InsertData(db, ttl);
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WriteOptions writeOptions;
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int key_ = 1;
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std::string key = std::to_string(key_);
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std::string value(1, 'a');
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db->Put(writeOptions, key, value, ttl);
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//std::cout << "time to alive" << ttl << std::endl;
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ReadOptions readOptions;
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std::string value_read;
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Status status = db->Get(readOptions, key, &value);
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//std::cout<<"start sleep for " <<
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Env::Default()->SleepForMicroseconds(ttl * 1000000);
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key_ = 1;
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key = std::to_string(key_);
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std::string value_read_second;
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status = db->Get(readOptions, key, &value_read_second);
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assert(status.ok() != true);
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return 0;
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}
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