I have a very simple "game" in which a robot is placed on a small 5×5 board and given orders. At the beginning, the robot must be placed on the board, then you can command it to move or to turn left and right. I tried to use object-oriented concepts, but this was not a requirement for my job. I think I did a good job and I would like to know what I did wrong.
Here are a few "requirements" for me:
The command "place" assumes an x, y position and a direction or NORTH, EAST, SOUTH or WEST.
Other commands may only be executed when the robot has been placed
Move moves the robot forward by 1 in the direction in which it is located
across from.
LEFT and RIGHT turn the robot in their respective directions
REPORT prints the current position and the viewing direction of the
robot
Place is a valid command, even if it has already been placed
Inputs that cause the robot to fall off the board must be
rejected or ignored
Invalid or "junk" entries are to be ignored
The robot takes commands in plain text, the robot must accept them
Write an SMS and follow the instructions if they are valid
Example input / output:
PLACE 1.3, WEST
MOVE
REPORT
Output: 0.3, WEST
and here is my robot.cpp
#include "robot.h"
#include "tabletop.h"
#include "helpers.h"
Namespace ToyRobot
{
// Used as an interface to provide statements as text
bool Robot :: command (std :: string statement)
{
std :: istringstream iss (statement);
std :: vector Token {std :: istream_iterator{iss}, std :: istream_iterator{}};
if (this-> commandList.count (token[0])> 0) // is the first token a valid command?
{
// command is valid
if (tokens[0] == "PLACE")
{// check if there are valid arguments
if (tokens.size () <2)
{
std :: cout << "Error! Not enough arguments for 'PLACE'n";
return false;
}
else
{
try
{
uint8_t arg1 = std::stoi(split(tokens[1], ",")[0]);
uint8_t arg2 = std::stoi(split(tokens[1], ",")[1]);
std::string arg3 = split(tokens[1], ",")[2];
this->place (arg1, arg2, arg3);
}
Catch (...)
{
return it incorrectly;
}
return true;
}
}
otherwise if[0] == "MOVE")
{
this-> move ();
}
otherwise if[0] == "LEFT" || token[0] == "RIGHT")
{
this-> turn (token[0]);
}
otherwise if[0] == "REPORT")
{
this-> printStatus ();
}
return true;
}
otherwise
return it incorrectly;
}
// checks if a certain position is valid (used only by other methods)
bool Robot :: isValidPosition (uint8_tx, uint8_t y)
{
if (x < 0 || x > TABLETOP_MAX_X || y < 0 || y > TABLETOP_MAX_Y)
return it incorrectly;
otherwise
return true;
}
// Places the robot ignoring invalid positions
bool Robot :: place (uint8_t x_place_pos, uint8_t_y_place_pos, std :: string facingDirection)
{
if (x_place_pos < 0 || x_place_pos > TABLETOP_MAX_X || y_place_pos < 0 || y_place_pos > TABLETOP_MAX_Y)
return it incorrectly;
if (this-> facingDirections.count (facingDirection) == 0) // check if the specified line of sight is valid
return it incorrectly;
this-> x_pos = x_place_pos;
this-> y_pos = y_place_pos;
this-> facingDirection = this-> facingDirections[facingDirection];
this-> placement = true;
return true;
}
// moves the robot forward by one, ignoring invalid moves
bool Robot :: move ()
{
if (this-> placed)
{
uint8_t sim_x = this-> x_pos;
uint8_t sim_y = this-> y_pos;
// simulate movement
if (facingDirection == 0)
sim_y + = 1;
otherwise if (facingDirection == 1)
sim_x + = 1;
otherwise if (facingDirection == 2)
sim_y - = 1;
otherwise if (facingDirection == 3)
sim_x - = 1;
if (isValidPosition (sim_x, sim_y)) // If it was valid, put and return true
{
this-> x_pos = sim_x;
this-> y_pos = sim_y;
return true;
}
otherwise // invalid train (out of bounds)
return it incorrectly;
}
otherwise // not placed
return it incorrectly;
}
// turns the robot in a given direction
bool Robot :: rotate (std :: string direction)
{
if (this-> placed)
{
uint8_t sim_direction = this-> facingDirection;
if (direction == "LEFT")
sim_direction = (sim_direction + 3)% 4; //To turn left
otherwise if (direction == "RIGHT")
sim_direction = (sim_direction + 1)% 4; // turn right
otherwise
return it incorrectly; //Invalid Input
this-> facingDirection = sim_direction;
return true;
}
otherwise // not placed
return it incorrectly;
}
void Robot :: printStatus ()
{
if (this-> placed)
std :: cout << int(this->x_pos) << & # 39 ;, & # 39; << int(this->y_pos) << & # 39 ;, & # 39; << (this->reverse directions[this->facingDirection]) << " n";
otherwise
std :: cout << "Robot is not yet placed on the tabletop! n";
}
}
#include "stdafx.h"
#include "helpers.h"
// Python's "split" function, implemented in C ++. Returns a vector of split std :: strings by a specified delimiter
std :: vector split (const std :: string & in, const std :: string & delim)
{
using std :: string;
using std :: vector;
string :: size_type start = in.find_first_not_of (delim), end = 0;
vector out;
while (start! = in.npos)
{
end = in.find_first_of (delim, start);
if (end == in.npos)
{
out.push_back (in.substr (start));
break;
}
otherwise
{
out.push_back (in.substr (start, end - start));
}
start = in.find_first_not_of (delim, end);
}
to return;
}
helpers.h
#pragma once
#include "stdafx.h"
std :: vector split (const std :: string & in, const std :: string & delim);
tabletop.h (there is no tabletop.cpp, since there is no need for it)
#pragma once
#include "stdafx.h"
constexpr auto TABLETOP_MAX_X = 4;
constexpr auto TABLETOP_MAX_Y = 4;
// 0.0 is the southwestern corner https://i.imgur.com/pm2XVHx.png
// Tabletop is never used, but it's here if needed
Class tabletop
{
Private:
const uint8_t x_len = TABLETOP_MAX_X;
const uint8_t y_len = TABLETOP_MAX_Y;
Public:
};
and finally my stdafx.h
#pragma once
#include
#include
#include
#include
#include
#include
#include
My robot head and my implementation are in a namespace because they are supposed to be compiled into a library.
In my web application, entities have unique IDs, and for some entity types (for example, user, order, and so on), user IDs are visible through URLs. MySQL is used to store the entities.
Using the auto-increment integer as the primary key is easy and convenient. However, if made available in the URL, users can estimate the entity quantity or rate by using the IDs (German Tank Problem). We may want to avoid this.
After reading many posts on the subject, I know of several approaches to mitigate disclosure of information, such as: Generate random IDs from the app, use UUIDs, encrypt / hashes the last insert ID, and so on.
But finally, I found my approach.
First, create a list of unique integers and preload them into the database.
Since I will not have billions of records, I could create a large sequential list and mix them in memory.
Table for storing the integers would be:
CREATE TABLE IF NOT EXIST
ID INT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
entity_id INT UNSIGNED NOT NULL UNIQUE
);
The ENTITY_ID The column is assigned the integer value.
Second, prepare the entity table and a counter table:
CREATE TABLE, IF NOT EXISTS entity1 (
ID INT UNSIGNED PRIMARY KEY,
create_time DATETIME DEFAULT CURRENT_TIMESTAMP
) ENGINE = InnoDB;
CREATE TABLE IF NOT EXISTS id_counter (
entity_name CHAR (30) PRIMARY KEY,
Counter INT NOT NULL DEFAULT 1
);
INSERT INTO id_counter (entity_name) VALUES (& # 39; entity1 & # 39;);
Finally, use a "BEFORE INSERT" trigger to retrieve an ID from the entity1_id Table, and increase the ID counter.
The counter is used to track the used IDs in entity1_id Table. think of entity1_id as a card, entity1_id[counter] Specifies the next entity ID.
Here is the trigger:
LIMITER |
CREATE TRIGGER entity1_idgen BEFORE INSERT ON entity1
BEGIN FOR EVERY ROW
DECLARE cnt, oath INT UNSIGNED;
IF (NEW.id IS NULL) THEN
SET cnt = (SELECT counter FROM id_counter WHERE entity_name = & lt; entity1 & # 39; FOR UPDATE);
SET eid = (SELECT entity_id FROM entity1_id WHERE id = cnt);
IF (oath is NULL) THEN
SET @errMsg = CONCAT ("Table` entity1_id` has no line with id =", cnt);
SIGNAL SQLSTATE & # 39; 45000 & # 39; SET MESSAGE_TEXT = @ errMsg;
END IF;
SET NEW.id = oath;
UPDATE id_counter SET counter = counter + 1 WHERE entity_name = & # 39; entity1 & # 39 ;;
END IF;
END |
DELIMITER;
I just tested this approach when I put it in the Unit 1 Table, if I would If no ID is given, an ID is taken from the entity1_id Table; If an ID is specified, it will be used entity1_id and id_counter is not visited; if I would is not specified and there are not enough IDs in entity1_idthe error is reported.
I think this approach is good for me:
I get randomly generated IDs
I can decide which IDs to use
It is not slow
In my opinion, this approach has three disadvantages:
I have been asked to redesign an existing website, before I do so I need to conduct an audit or review the existing content. I want to know how many pages, documents, and so on, so that I can specify an exact completion time for the project.
I've tried Screaming Frog, but I seem to get many duplicate pages. I know there are at least 500 pages, so I'm limited to the free version of some tools.
Is there any other option or suggested alternative than doing this manually?
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Her staff now, her staff of 1 (from all tickets, I just got Ryan, I think), her 1 staff took care of everything for me when I had to do things. He was punctual, fast, very friendly and has a great attitude, even if you read through the tickets. Of all this, I can only praise his work as a technician on site, who does all the work. He is super friendly again, has taken care of and even made sure that everything is going well. He's a great … and I mean, Hivelocity is a BIG win. If anything, he has to take care of everything, because every data center would be lucky enough to have a dedicated employee like him. So Hivelocity, I'd better hear that he cares
The last thing that impressed me was the operating time. I do not think my servers were down during my time at Incero (unless I was guilty or the 1 hard drive failed during Linux installation). I did not even have big latency spikes, weird issues where bgp passed your data incoherently. I honestly had perfect hours of operation. I'm sure if I ever had an uptime timer for it, I'd put it here and display the perfect 100% uptime (unless I'm an idiot and conflict with a production server). Your network is top-notch, alerting you quickly to any misuse of IP and spikes in traffic, and ensuring that your server is not hit hard.
I will return to Incero once a day to settle there as a second location so I can safely split my setup. Incero is the second location at the top of my colocation list. I can only say good things about these guys. Please select Incero if you want to set up a location in Dallas, Texas, or any location you provide. If I could do it all over again, I would still choose Incero as I did. It was a damn good time with them. We just quit our last server with them because we have our own hardware. But I know I'll work with them soon enough if we need more racks in Dallas.
TLDR
Please, go with Incero. Best company I've worked with for years. Perfect uptime (except when I'm stupid), great staff! Your service is the best in Dallas, hell, maybe across Texas.
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I would appreciate your feedback on design and features. Many Thanks!
