Utility.h

/*
This program has been developed by students from the bachelor Computer Science at
Utrecht University within the Software Project course.
© Copyright Utrecht University (Department of Information and Computing Sciences)
*/
 
#pragma once
#include <string>
#include <vector>
#include <functional>
#include <math.h>
#include <unistd.h>
 
#define MAX_RETRIES 3
#define RETRY_SLEEP 1000000
 
class Utility
{
public:
    static int safeStoi(std::string str);
 
    static long long safeStoll(std::string str);
 
    static long long safeStod(std::string str);
 
    static void appendBy(std::vector<char> &result, std::string word, char delimiter);
 
    static void appendBy(std::vector<char> &result, std::vector<std::string> words, char wordSeparator, char endChar);
 
    static std::vector<std::string> splitStringOn(std::string str, char delimiter);
 
    static std::string hashToUUIDString(std::string hash);
 
    static std::string uuidStringToHash(std::string uuid);
 
    static long long getCurrentTimeSeconds();
 
    static long long getCurrentTimeMilliSeconds();
 
    template <class T> static T queryWithRetry(std::function<T()> query)
    {
        errno = 0;
        int retries = 0;
        T items;
        do
        {
            items = query();
            if (errno != 0 && errno != ERANGE)
            {
                usleep(pow(2, retries) * RETRY_SLEEP);
                retries++;
            }
        } while (errno != 0 && errno != ERANGE && retries <= MAX_RETRIES);
        if (retries > MAX_RETRIES)
        {
            errno = ENETUNREACH;
        }
        return items;
    };
};