public JsonResult GetScore(int StudentID = 0)
{
//fetch the score for the user
//--Call sendReport
//return the score to the calling method
}
public void SendReport(int StudentID = 0)
{
//Logic to get the detaied marks and prepare the report's PDF
//Mail the generated PDF back to student
}
In my web application, while Student clicks for score student will get his/her score on screen and will get detailed report's PDF mailed to his/her registered mail.
Now problem is I would like to run SendReport in background, so student will come to know his/her score immediately without waiting.
I've gone through this question but it gives me error of invalid argument.
public JsonResult GetScore(int StudentID)
{
//fetch the score for the user
Task.Factory.StartNew(() => SendReport(StudentID));
//return the score
}
you could just call it in a new thread
new Thread(SendReport(StudentID)).Start();
If you're looking for a quick and dirty solution to this problem, it's to make your controller look like this:
public JsonResult GetScore(int StudentID = 0)
{
//fetch the score for the user
//return the score to the calling method
}
public JsonResult SendReport(int StudentID = 0)
{
//Logic to get the detaied marks and prepare the report's PDF
//Mail the generated PDF back to student
//Return a JsonResult indicating success
}
... and then make two JQuery calls to your controller. One to get the score and one to kick off the report. You can display the score as soon as you get it, and the report will still be chugging in the background.
Bear in mind, if the report takes longer than a few seconds to generate and email, you really should consider moving that execution to a service that you simply activate via MVC, since running it in a controller method ties up web server resources until it's finished.
See the new MVC async documentation for details on doing this.
Related
We currently have the following code on our custom DNN module:
public class FeatureController : ModuleSearchBase
{
public CommonDataDefinitions.Products.WebProductDetails ProductDetails { get; set; } = null;
public override IList<SearchDocument> GetModifiedSearchDocuments(ModuleInfo moduleInfo, DateTime beginDateUtc)
{
var searchDocuments = new List<SearchDocument>
{
WHAT CAN I RETURN HERE?
};
return searchDocuments;
throw new NotImplementedException();
}
}
Our Detailed Product View module retrieves the following information depending on the SKU in a query string on load using a web API Controller.
Product.Title
Product.Description
Product.Image
Product.Price
Product.DetailedDescription
Product.StockCode Product.MetaTitle
Product.MetaKeywords
Product.MetaDescription
The SearchModulebase code will be in the FeatureController class.
This page will be loaded each time someone looks at a product in detail when they navigate from the Product Filter Module.
1. Since the module will be loaded each time when someone clicks on a particular product. How do you run this code only once and return all the products from the API Controller? Do we need to create an Object which will retrieve everything?
2. How do you prevent the module from becoming slow when all the products have to be retrieved on the on load event?
3. Which SearchDocument information can be returned for the DNN Crawler to index?
4. When the DNN Crawler reads the Feature Controller code, how do you initialize your API Controller to go and fetch and Populate the results to be indexed?
I have extended the built-in User ContentType with a Content Picker Field that can be used to select multiple Video ContentItems. This gives me a video multi-picker control on the Edit page of each User.
I love how Orchard CMS makes this so elegantly simple to setup.
Now that I can associate multiple Videos with a User, I'd like to create a Query that will display just the Videos that the currently logged in User has been granted access.
I was hoping to be able to setup a Query using the Projector module, in what I thought was the obvious way (see below), but this returns no results.
This is how I configured the second filter:
Clicked on the + Add a new Filter link on the Edit Query screen
Chose Videos:Ids from the User Content Fields section, like this:
Configured the new filter like this:
What am I doing wrong, or what is the simplest way of diagnosing this issue?
This is how the Content Picker field is defined:
I have spotted my error - it was due to me not having a proper understand of how the filters worked. The Videos:Ids filter in the User Content Fields section does not give access to the current user's list of videos, as I assumed. Instead, it is offering the field to be used in the filter, which would be useful if I were to write a query to produce a list of Users that had access to a specific Video.
It was wishful thinking that it worked the way I wanted, but it's obvious in retrospect how it actually works.
Update: in the hope it's useful for others, here's the custom filter I developed:
public interface IFilterProvider : IEventHandler
{
void Describe(dynamic describe);
}
public class CurrentUserVideosFilter : IFilterProvider
{
private readonly IWorkContextAccessor _workContextAccessor;
public CurrentUserVideosFilter(IWorkContextAccessor workContextAccessor)
{
_workContextAccessor = workContextAccessor;
T = NullLocalizer.Instance;
}
public Localizer T { get; set; }
public void Describe(dynamic describe)
{
describe.For("My Filter Category", T("My Filter Category"), T("My Filter Category"))
.Element("Current User's Videos", T("Current User's Videos"), T("Current User's Videos"),
(Action<dynamic>)ApplyFilter,
(Func<dynamic, LocalizedString>)DisplayFilter,
null
);
}
public void ApplyFilter(dynamic context)
{
var query = (IHqlQuery)context.Query;
context.Query = query.ForType("Video")
.Where(x => x.ContentPartRecord<IdentityPartRecord>(), x => x.InG("Id", GetVideoIdsForCurrentUser()));
}
private IList<int> GetVideoIdsForCurrentUser()
{
var currentUser = _workContextAccessor.GetContext().CurrentUser;
if (currentUser == null) return new int[0];
dynamic item = currentUser.ContentItem;
var videoContentItems = (IEnumerable<ContentItem>)item.User.Videos.ContentItems;
return videoContentItems.Select(i => i.Id).ToList();
}
public LocalizedString DisplayFilter(dynamic context)
{
return T("Videos that have been assigned to the currently logged in user");
}
}
I created this class in a new Orchard module, which contains all my customisations for the site I'm building. Once I installed the module, the filter was immediately available. I assume Orchard uses reflection to seek out all types that implement the IFilterProvider interface.
This is how the filter appears on the Add a Filter screen:
Clicking on the filter shows this screen:
Once the filter has been saved, the query works exactly how I'd like - it shows all videos that have been assigned to the currently logged in user.
I have got a question related to CQRS in data centric processes. Let me explain it better.
Consider we have a SOAP/JSON/whatever service, which transfers some data to our system during an integration process. It is said that in CQRS every state change must be achieved by the means of commands (or events if Event Sourcing is used).
When it comes to our integrating process we have got a great deal of structured DATA instead of a set of commands/events and I am wondering how to actually process those data.
// Some Façade service
class SomeService
{
$_someService;
public function __construct(SomeService $someService)
{
$this->_someService = $someService;
}
// Magic function to make it all good and
public function process($dto)
{
// if I get it correctly here I need somehow
// convert incoming dto (xml/json/array/etc)
// to a set of commands, i. e
$this->someService->doSomeStuff($dto->someStuffData);
// SomeStuffChangedEvent raised here
$this->someService->doSomeMoreStuff($dtom->someMoreStuffData);
// SomeMoreStuffChangedEvent raised here
}
}
My question is whether my suggestion is suitable in the given case or there may be some better methods to do what I need. Thank you in advance.
Agreed, a service may have a different interface. If you create a rest-api to update employees, you may want to provide an UpdateEmployeeMessage which contains everything that can change. In a CRUD-kind of service, this message would probably mirror the database.
Inside of the service, you can split the message into commands:
public void Update(UpdateEmployeeMessage message)
{
bus.Send(new UpdateName
{
EmployeeId = message.EmployeeId,
First = message.FirstName,
Last = message.LastName,
});
bus.Send(new UpdateAddress
{
EmployeeId = message.EmployeeId,
Street = message.Street,
ZipCode = message.ZipCode,
City = message.City
});
bus.Send(new UpdateContactInfo
{
EmployeeId = message.EmployeeId,
Phone = message.Phone,
Email = message.Email
});
}
Or you could call the aggregate directly:
public void Update(UpdateEmployeeMessage message)
{
var employee = repository.Get<Employee>(message.EmployeeId);
employee.UpdateName(message.FirstName, message.LastName);
employee.UpdateAddress(message.Street, message.ZipCode, message.City);
employee.UpdatePhone(message.Phone);
employee.UpdateEmail(message.Email);
repository.Save(employee);
}
I have already added 5 cammands in a form and I want to add a sixth but It does not display the sixth?
I am posting my codes below.
public Command getOk_Lastjourney() {
if (Ok_Lastjourney == null) {
// write pre-init user code here
Ok_Lastjourney = new Command("Last Journey", Command.OK, 0);
// write post-init user code here
}
return Ok_Lastjourney;
}
public Form getFrm_planjourney() {
if (frm_planjourney == null) {
// write pre-init user code here
frm_planjourney = new Form("Plan journey", new Item[] { getTxt_From(), getTxt_To(), getCg_usertype(), getCg_userpref(), getCg_searchalgo() });
frm_planjourney.addCommand(getExt_planjourney());
frm_planjourney.addCommand(getOk_planjourney());
frm_planjourney.addCommand(getOk_planFare());
frm_planjourney.addCommand(getOk_planDistance());
frm_planjourney.addCommand(getOk_planTime());
frm_planjourney.addCommand(getOk_planRoute());
frm_planjourney.setCommandListener(this);
// write post-init user code here
System.out.println("Appending.....");
System.out.println("Append completed...");
System.out.println(frm_planjourney.size());
frm_planjourney.setItemStateListener(this);
}
return frm_planjourney;
}
Given System.out.println I assume you were debugging with emulator, right? in that case it would be really helpful to provide a screen shot showing how exactly does not display the sixth looks like.
Most likely you just got too many commands to fit to area allocated so that some of them are not shown until scrolled. There is also a chance that sixth command was reassigned to some other soft-button and you didn't notice that. Or there's something else - hard to tell with details you provided.
A general note - handling six actions with commands might be not the best choice in MIDP UI. For stuff like that, consider using lcdui List API instead. IMPLICIT kind of lists allow for more reliable and user friendly design than commands.
Im using subsonic 2.2
I tried asking this question another way but didnt get the answer i was looking for.
Basically i ususally include validation at page level or in my code behind for my user controls or aspx pages. However i haev seen some small bits of info advising this can be done within partial classes generated from subsonic.
So my question is, where do i put these, are there particular events i add my validation / business logic into such as inserting, or updating. - If so, and validation isnt met, how do i stop the insert or update. And if anyone has a code example of how this looks it would be great to start me off.
Any info greatly appreciated.
First you should create a partial class for you DAL object you want to use.
In my project I have a folder Generated where the generated classes live in and I have another folder Extended.
Let's say you have a Subsonic generated class Product. Create a new file Product.cs in your Extended (or whatever) folder an create a partial class Product and ensure that the namespace matches the subsonic generated classes namespace.
namespace Your.Namespace.DAL
{
public partial class Product
{
}
}
Now you have the ability to extend the product class. The interesting part ist that subsonic offers some methods to override.
namespace Your.Namespace.DAL
{
public partial class Product
{
public override bool Validate()
{
ValidateColumnSettings();
if (string.IsNullOrEmpty(this.ProductName))
this.Errors.Add("ProductName cannot be empty");
return Errors.Count == 0;
}
// another way
protected override void BeforeValidate()
{
if (string.IsNullOrEmpty(this.ProductName))
throw new Exception("ProductName cannot be empty");
}
protected override void BeforeInsert()
{
this.ProductUUID = Guid.NewGuid().ToString();
}
protected override void BeforeUpdate()
{
this.Total = this.Net + this.Tax;
}
protected override void AfterCommit()
{
DB.Update<ProductSales>()
.Set(ProductSales.ProductName).EqualTo(this.ProductName)
.Where(ProductSales.ProductId).IsEqualTo(this.ProductId)
.Execute();
}
}
}
In response to Dan's question:
First, have a look here: http://github.com/subsonic/SubSonic-2.0/blob/master/SubSonic/ActiveRecord/ActiveRecord.cs
In this file lives the whole logic I showed in my other post.
Validate: Is called during Save(), if Validate() returns false an exception is thrown.
Get's only called if the Property ValidateWhenSaving (which is a constant so you have to recompile SubSonic to change it) is true (default)
BeforeValidate: Is called during Save() when ValidateWhenSaving is true. Does nothing by default
BeforeInsert: Is called during Save() if the record is new. Does nothing by default.
BeforeUpdate: Is called during Save() if the record is new. Does nothing by default.
AfterCommit: Is called after sucessfully inserting/updating a record. Does nothing by default.
In my Validate() example, I first let the default ValidatColumnSettings() method run, which will add errors like "Maximum String lenght exceeded for column ProductName" if product name is longer than the value defined in the database. Then I add another errorstring if ProductName is empty and return false if the overall error count is bigger than zero.
This will throw an exception during Save() so you can't store the record in the DB.
I would suggest you call Validate() yourself and if it returns false you display the elements of this.Errors at the bottom of the page (the easy way) or (more elegant) you create a Dictionary<string, string> where the key is the columnname and the value is the reason.
private Dictionary<string, string> CustomErrors = new Dictionary<string, string>
protected override bool Validate()
{
this.CustomErrors.Clear();
ValidateColumnSettings();
if (string.IsNullOrEmpty(this.ProductName))
this.CustomErrors.Add(this.Columns.ProductName, "cannot be empty");
if (this.UnitPrice < 0)
this.CustomErrors.Add(this.Columns.UnitPrice, "has to be 0 or bigger");
return this.CustomErrors.Count == 0 && Errors.Count == 0;
}
Then if Validate() returns false you can add the reason directly besides/below the right field in your webpage.
If Validate() returns true you can safely call Save() but keep in mind that Save() could throw other errors during persistance like "Dublicate Key ...";
Thanks for the response, but can you confirm this for me as im alittle confused, if your validating the column (ProductName) value within validate() or the beforevalidate() is string empty or NULL, doesnt this mean that the insert / update has already been actioned, as otherwise it wouldnt know that youve tried to insert or update a null value from the UI / aspx fields within the page to the column??
Also, within asp.net insert or updating events we use e.cancel = true to stop the insert update, if beforevalidate failes does it automatically stop the action to insert or update?
If this is the case, isnt it eaiser to add page level validation to stop the insert or update being fired in the first place.
I guess im alittle confused at the lifecyle for these methods and when they come into play