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85 行
2.1 KiB
85 行
2.1 KiB
#include "leveldb/env.h"
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#include "leveldb/db.h"
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#include "ctime"
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#include <iostream>
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#include <cstdlib>
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using namespace leveldb;
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constexpr int value_size = 2048;
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constexpr int data_size = 4096 << 1;
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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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return DB::Open(options, dbName, db);
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}
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void InsertData(DB *db, uint64_t ttl/* second */) {
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printf("-----inserting-----\n");
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Status status;
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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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int key_ = i+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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status = db->Put(writeOptions, key, value, ttl);
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assert(status.ok());
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}
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}
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void GetData(DB *db, int size = (1 << 30)) {
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ReadOptions readOptions;
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int key_num = data_size / value_size;
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// 点查
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srand(static_cast<unsigned int>(time(0)));
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for (int i = 0; i < 100; 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;
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db->Get(readOptions, key, &value);
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}
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}
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int main(int argc, char** argv) {
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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 = 3;
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InsertData(db, ttl);
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printf("-----seeking-----\n");
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ReadOptions readOptions;
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Status status;
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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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int key_ = i+1;
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std::string key = std::to_string(key_);
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std::string value;
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status = db->Get(readOptions, key, &value);
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assert(status.ok());
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}
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Env::Default()->SleepForMicroseconds(ttl * 1000000);
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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;
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status = db->Get(readOptions, key, &value);
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assert(status.IsNotFound());
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}
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printf("success!\n");
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}
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