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Handling exceptions while getting data when its possible


Handling exceptions while getting data when its possible

By : Suraj Kumar
Date : November 20 2020, 01:01 AM
hope this fix your issue Below is the code I am using to retrieve data from several urls. For couple of urls I get exception but for all others I do get valid data. Problem is that with apporoach below, I am not able to collect data for threads that were able to retrieve data without any issue. Is there anyway to collect as much url response while also knowing which urls throw exceptions? , Yes, there is:
code :
var tasks = URLsToProcess.Select(uri => DownloadStringAsTask(new Uri(uri))).ToArray();

while (tasks.Any())
{
    try
    {
        Task.WaitAll(tasks);
        break;
    }
    catch (Exception e)
    {
        // handle exception/report progress...
        tasks = tasks.Where(t => t.Status != TaskStatus.Faulted).ToArray();
    }
}

var results = tasks.Select(t => t.Result);


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Data Mapper pattern, exceptions, and handling user-provided data

Data Mapper pattern, exceptions, and handling user-provided data


By : Lukasz Pluskota
Date : March 29 2020, 07:55 AM
will help you A Domain Model is not necessarily an object that can be directly translated to a database row. Your Person example does fit this description, and I like to call such an object an Entity (adopted from the Doctrine 2 ORM). But, like Martin Fowler describes, a Domain Model is any object that incorporates both behavior and data.
a strict solution
code :
class Person
{
    /**
     * @var string
     */
    protected $firstname;

    /**
     * @var string
     */
    protected $lastname;

    /**
     * @var string|null
     */
    protected $maidenname;

    /**
     * @param  string      $firstname
     * @param  string      $lastname
     * @param  string|null $maidenname
     */
    public function __construct($firstname, $lastname, $maidenname = null)
    {
        $this->setFirstname($firstname);
        $this->setLastname($lastname);
        $this->setMaidenname($maidenname);
    }

    /**
     * @param string $firstname
     */
    public function setFirstname($firstname)
    {
        if (!is_string($firstname)) {
            throw new InvalidArgumentException('Must be a string');
        }

        $this->firstname = $firstname;
    }

    /**
     * @return string
     */
    public function getFirstname()
    {
        return $this->firstname;
    }

    /**
     * @param string $lastname
     */
    public function setLastname($lastname)
    {
        if (!is_string($lastname)) {
            throw new InvalidArgumentException('Must be a string');
        }

        $this->lastname = $lastname;
    }

    /**
     * @return string
     */
    public function getLastname()
    {
        return $this->lastname;
    }

    /**
     * @param string|null $maidenname
     */
    public function setMaidenname($maidenname)
    {
        if (!is_string($maidenname) or !is_null($maidenname)) {
            throw new InvalidArgumentException('Must be a string or null');
        }

        $this->maidenname = $maidenname;
    }

    /**
     * @return string|null
     */
    public function getMaidenname()
    {
        return $this->maidenname;
    }
}
class PersonController
{
    /**
     * @param Request      $request
     * @param PersonMapper $mapper
     * @param ViewRenderer $view
     */
    public function createAction($request, $mapper, $view)
    {
        if ($request->isPost()) {
            $data = $request->getPostData();

            $personForm = new PersonForm();
            $personForm->setData($data);

            if ($personForm->isValid()) {
                $person = new Person(
                    $personForm->getFirstname(),
                    $personForm->getLastname(),
                    $personForm->getMaidenname()
                );

                $mapper->insert($person);

                // redirect
            } else {
                $view->setErrors($personForm->getViolations());
                $view->setData($data);
            }
        }

        $view->render('create/add');
    }
}
Initiation in C# - Data and Exceptions handling

Initiation in C# - Data and Exceptions handling


By : Junaid Farooqui
Date : March 29 2020, 07:55 AM
this one helps. My name is Carlos and i recently began to learn programming (completely from scratch) through an E-learning class. My tutor is using C# as an introductory language. I searched in the forum and although i found somewhat similar problems, they don't address my current doubts as most questions are of a more advanced content. I'm having a bit of trouble in a exercise regarding Data and Exceptions handling, specifically in the following exercise: , You're trying to parse nr_de_produtos to an int:
code :
int.TryParse(nr_de_produtos, out x)
var nr_de_produtos = int.Parse(Console.ReadLine());
var nr_de_produtos = Console.ReadLine();
switch (nr_de_produtos)
{
    //...
}
Handling NSData (Data) range exceptions

Handling NSData (Data) range exceptions


By : Izzy
Date : March 29 2020, 07:55 AM
like below fixes the issue You need to check that the the upper index of the range you're using isn't out of range for your Data:
code :
if dataRange.upperBound <= data.count {
    data.copyBytes(to: &result, from: dataRange)
}
Handling custom exceptions (i18n) with Spring Data REST

Handling custom exceptions (i18n) with Spring Data REST


By : vipzhangdian
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further I'm using Spring Boot 1.5.4 with Spring JPA, Spring Data REST, HATEOAS... I'm looking for a best practice (Spring way) to customize exceptions Spring Data REST is managing adding the i18n support.
code :
@ControllerAdvice(annotations = RepositoryRestController.class)
public class GenericExceptionHandler {
    @Autowired
    private MessageSource messageSource;

    @ExceptionHandler
    //if you don't use Exception e in method you can remove it , live only Locale
    public ResponseEntity handle(Exception e, Locale locale) {

            String errorMessage = messageSource.getMessage(
                                 "error.message", new Object[]{},locale);  
            //set message  or return it instead of exceptionMessageObject
            exceptionMessageObject.setMessage(exceptionMessageObject);

            return new ResponseEntity(exceptionMessageObject, 
                   new HttpHeaders(), httpStatus);
    }
public class CustomError {
    private HttpStatus status;
    private String message;
    private Exception originalException;//if you need it        
    // getter setter
}
private String resolveExceptionToMessage(Exception exceptio){
    //or put in map<Exceptio,String error.message.type1> 
    // String errorCode = map.get(excptio);
    //eturn messageSource.getMessage(errorCode , new Object[]{},locale);
    if(exceptio instanceof ....){
        return messageSource.getMessage("error.message.type1", new Object[]{},locale);
    }
    return "";
}
 @ExceptionHandler({ CustomException1.class})
    public ResponseEntity handleException1() {
        return createError(code for this exceptio 1);
    }
    @ExceptionHandler({ CustomException2.class})
    public ResponseEntity handleException2() {
        return createError(code for this exceptio 2);
    }
    private ResponseEntity createError(String errorCode ) {
            CustomError customError = new CustomError();
            customError.setHttpStatus(HttpStatus.BAD_REQUEST);
            String errorMessage = messageSource.getMessage(
                                 errorCode , new Object[]{},locale); 

            customError.setMessage(errorMessage );
            customError.setOriginalException(e);
            return new ResponseEntity<Object>(customError, new HttpHeaders(), 
                          customError.getStatus());
    }
public ResponseEntity handle(Exception e, Locale locale) {
        CustomError customError = new CustomError();
        customError.setHttpStatus(HttpStatus.BAD_REQUEST);
        customError.setMessage(resolveExceptionToMessage(e));
        customError.setOriginalException(e);
        return new ResponseEntity<Object>(customError, new HttpHeaders(), 
                      customError.getStatus());
}
C# What is best practise for handling Data Errors and Warnings as opposed to Exceptions

C# What is best practise for handling Data Errors and Warnings as opposed to Exceptions


By : user2500538
Date : March 29 2020, 07:55 AM
will be helpful for those in need Microsoft and SOLID are right.
The correct way to go are Exceptions as per standard practices (and c#), independently of another considerations, like performance for instance.
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