I use ignite as session and cache provider. I have a class with IBinarizable interface. ReadBinary and WriteBinary methods only work for cache object serialization. How can i activate these methods for session object serialization ?
public class Test : IBinarizable
{
public int A { get; set; }
public string B { get; set; }
public void ReadBinary(IBinaryReader reader)
{
A = reader.ReadInt("a");
B = reader.ReadString("b");
}
public void WriteBinary(IBinaryWriter writer)
{
writer.WriteInt("a", A);
writer.WriteString("b", B);
}
}
Unfortunately, there is no way to do so. Ignite ASP.NET session state provider always uses BinaryFormatter to serialize data, and does not support anything else.
The reason is legacy, before 2.0 there were some strict requirements for Binarizable types.
Related
I do a Generic and using DI
so I create a empty class
public class DBRepo
{
}
and my model class to inheriting class DBRepo
public partial class UserAccount : DBRepo
{
public int Id { get; set; }
public string Account { get; set; }
public string Pwd { get; set; }
}
then this is a Interface to do CRUD
public interface IDBAction<TEntity> where TEntity : class,new()
{
void UpdateData(TEntity _entity);
void GetAllData(TEntity _entity);
}
public class DBService<TEntity> : IDBAction<TEntity> where TEntity : class,new()
{
private readonly CoreContext _db;
public DBService(CoreContext _db)
{
this._db = _db;
}
public void UpdateData(TEntity _entity)
{
this._db.Set<TEntity>().UpdateRange(_entity);
this._db.SaveChanges();
}
public void GetAllData(TEntity _entity)
{
var x = this._db.Set<TEntity>().Select(o => o).ToList();
}
}
And I Dependency Injection Service Provider in constructor
this.DBProvider = new ServiceCollection()
.AddScoped<IDBAction<DBRepo>, DBService<DBRepo>>()
.AddScoped<DBContext>()
.AddDbContext<CoreContext>(options => options.UseSqlServer(ConnectionString))
.BuildServiceProvider();
last step I Get Services
DBProvider.GetService<IDBAction<DBRepo>>().GetAllData(new UserAccount());
I will get a error message same with title
or I change to
DBProvider.GetService<IDBAction<UserAccount>>().GetAllData(new UserAccount());
I'll get other message
Object reference not set to an instance of an object.'
but the void UpdateData() is can work,
so how to fix GetAllData() problem?
The error simply is because the class you're using here UserAccount has apparently not been added to your context, CoreContext. There should be a property there like:
public DbSet<UserAccount> UserAccounts { get; set; }
Regardless of whether you end up using the generic Set<T> accessor, you still must defined a DbSet for the entity on your context.
That said, you should absolutely not be creating your own service collection inside your repo. Register your context and your repo with the main service collection in Startup.cs and then simply inject your repo where you need it. The DI framework will take care of instantiating it with your context, as long as you have a constructor that takes your context (which you seem to).
And that said, you should ditch the repo entirely. It still requires a dependency on Entity Framework and doesn't do anything but proxy to Entity Framework methods. This is just an extra thing you have to maintain and test with no added benefit.
I have an Orchard CMS module that loads up some code which provides service functions. The service code is written to be host agnostic and has been used with ASP.NET and WCF previously. The service code uses MEF to load plugins. One such plugin is for audit.
In an attempt to allow access to the Orchard database for audit I have modified the service code to also allow the host to pass in an audit implementation instance. Thus my Orchard module can pass in an instance when the service starts with the intention that this instance writes audit data as records in the Orchard DB.
I have created a migration for my database:
public int UpdateFrom5()
{
SchemaBuilder.CreateTable("AuditRecord",
table => table
.Column<int>("Id", c => c.PrimaryKey().Identity())
.Column<int>("AuditPoint")
.Column<DateTime>("EventTime")
.Column("CampaignId", DbType.Guid)
.Column("CallId", DbType.Guid)
.Column<String>("Data")
);
return 6;
}
I have created my AuditRecord model in Models:
namespace MyModule.Models
{
public class AuditRecord
{
public virtual int Id { get; set; }
public virtual int AuditPoint { get; set; }
public virtual DateTime EventTime { get; set; }
public virtual Guid CampaignId { get; set; }
public virtual Guid CallId { get; set; }
public virtual String Data { get; set; }
}
}
I have added an IAuditWriter interface that derives from IDependency so that I can inject a new instance when my module starts.
public interface IAuditWriter : IDependency
{
void WriteAuditRecord(AuditRecord data);
}
For my audit writer instance to work with the existing service code it must be derived from an abstract class FlowSinkAudit defined in the service library. The abstract class defines the Audit method. When the service needs to write audit it calls the audit method on all instances derived from the FlowAuditSink abstract class that have been instantiated either through MEF or by passing in an instance at startup.
public class AuditWriter : FlowAuditSink, IAuditWriter
{
private readonly IComponentContext ctx;
private readonly IRepository<AuditRecord> repo;
public AuditWriter(IComponentContext ctx, IRepository<AuditRecord> repo)
{
this.ctx = ctx;
this.repo = repo;
}
public void WriteAuditRecord(AuditRecord data)
{
// Get an audit repo
//IRepository<AuditRecord> repo = (IRepository<AuditRecord>)ctx.Resolve(typeof(IRepository<AuditRecord>));
using (System.Transactions.TransactionScope t = new System.Transactions.TransactionScope(System.Transactions.TransactionScopeOption.Suppress))
{
this.repo.Create(data);
}
}
public override void Audit(DateTime eventTime, AuditPoint auditPoint, Guid campaignId, Guid callId, IDictionary<String, Object> auditPointData)
{
// Add code here to write audit into the Orchard DB.
AuditRecord ar = new AuditRecord();
ar.AuditPoint = (int)auditPoint;
ar.EventTime = eventTime;
ar.CampaignId = campaignId;
ar.CallId = callId;
ar.Data = auditPointData.AsString();
WriteAuditRecord(ar);
}
}
My service code is started from a module level class that implements IOrchardShellEvents
public class Module : IOrchardShellEvents
{
private readonly IAuditWriter audit;
private readonly IRepository<ServiceSettingsPartRecord> settingsRepository;
private readonly IScheduledTaskManager taskManager;
private static readonly Object syncObject = new object();
public ILogger logger { get; set; }
public Module(IScheduledTaskManager taskManager, IRepository<ServiceSettingsPartRecord> settingsRepository, IAuditWriter audit)
{
this.audit = audit;
this.settingsRepository = settingsRepository;
this.taskManager = taskManager;
logger = NullLogger.Instance;
}
...
When the service is started during the "Activated" event, I pass this.Audit to the service instance.
public void Activated()
{
lock (syncObject)
{
var settings = settingsRepository.Fetch(f => f.StorageProvider != null).FirstOrDefault();
InitialiseServer();
// Auto start the server
if (!StartServer(settings))
{
// Auto start failed, setup a scheduled task to retry
var tasks = taskManager.GetTasks(ServerAutostartTask.TaskType);
if (tasks == null || tasks.Count() == 0)
taskManager.CreateTask(ServerAutostartTask.TaskType, DateTime.Now + TimeSpan.FromSeconds(60), null);
}
}
}
...
private void InitialiseServer()
{
if (!Server.IsInitialized)
{
var systemFolder = #"C:\Scratch\Plugins";
if (!Directory.Exists(systemFolder))
Directory.CreateDirectory(systemFolder);
var cacheFolder = System.Web.Hosting.HostingEnvironment.MapPath("~/App_Data/MyModule/Cache");
if (!Directory.Exists(cacheFolder))
Directory.CreateDirectory(cacheFolder);
Server.Initialise(systemFolder, cacheFolder, null, (FlowAuditSink)audit);
}
}
All of this works as expected and my service code calls the audit sink.
My problem is that when the audit sink is called and I try to write the audit to the database using this.repo.Create(data) nothing is written.
I have also attempted to create a new repository object by using the IComponentContext interface but this errors with object already disposed. I assume this is because the audit sink is a long lived object instance.
I have attempted both with and without the current transaction suspended which doesn't affect the result. I assume this is because the call is not coming through ASP.NET MVC but from a thread created by the service code.
Can anyone tell my how I can get my audit data to appear in the Orchard database?
Thanks
Chris.
Well, I have a solution, but as I'm not very familiar with Orchards architecture it may not be the best way.
After a good deal of delving into the Orchard sources it struck me that the crux of this issue can be summarised as
"how do I access the Orchard autofac injection mechanism from a thread that does not use the Http request pipeline".
I figured that this is what a scheduled task must do so I created a scheduled task and set a breakpoint in IScheduledTaskHandler.Process to discover how the task was executed. Looking at Orchard\Tasks\SweepGenerator.cs showed me the way.
I modified my AuditWriter thusly:
public interface IAuditWriter : ISingletonDependency
{
}
public class AuditWriter : FlowAuditSink, IAuditWriter
{
private readonly IWorkContextAccessor _workContextAccessor;
public AuditWriter(IWorkContextAccessor workContextAccessor)
{
_workContextAccessor = workContextAccessor;
}
public override void Audit(DateTime eventTime, AuditPoint auditPoint, Guid campaignId, Guid callId, IDictionary<String, Object> auditPointData)
{
// Add code here to write audit into the Orchard DB.
AuditRecord ar = new AuditRecord();
ar.AuditPoint = (int)auditPoint;
ar.EventTime = eventTime;
ar.CampaignId = campaignId;
ar.CallId = callId;
ar.Data = auditPointData.AsString();
using (var scope = _workContextAccessor.CreateWorkContextScope())
{
// resolve the manager and invoke it
var repo = scope.Resolve<IRepository<AuditRecord>>();
repo.Create(ar);
repo.Flush();
}
}
}
scope.Resolve works and my data is successfully written to the Orchard DB.
At the moment, I don't think my use of ISingletonDependency is working correctly as my constructor is only called when my module injects an AuditWriter instance in its constructor and it happens more than once.
Anyway it seems that to gain access to the Orchard autofac resolution mechanism from a non Http thread we use IWorkContextAccessor
Please let me know if this is not correct.
We have a problem concerning Entity Framework objects and sending them through WCF.
We have a database, and Entity Framework created classes from that database, a 'Wallet' class in this particular situation.
We try to transfer a Wallet using this code:
public Wallet getWallet()
{
Wallet w = new Wallet();
w.name = "myname";
w.walletID = 123;
return w;
}
We need to transfer that Wallet class, but it won't work, we always encounter the same exception:
"An error occurred while receiving the HTTP response to localhost:8860/ComplementaryCoins.svc. This could be due to the service endpoint binding not using the HTTP protocol. This could also be due to an HTTP request context being aborted by the server (possibly due to the service shutting down). See server logs for more details."
We searched on the internet, and there is a possibility that the error is due to the need of serialization of Entity Framework-objects.
We have absolutely no idea if this could be the case, and if this is the case, how to solve it.
Our DataContract looks like this (very simple):
[DataContract]
public partial class Wallet
{
[DataMember]
public int getwalletID { get { return walletID; } }
[DataMember]
public string getname { get { return name; } }
}
Does anyone ever encountered this problem?
EDIT: Our Entity Framework created class looks like this:
namespace ComplementaryCoins
{
using System;
using System.Collections.Generic;
public partial class Wallet
{
public Wallet()
{
this.Transaction = new HashSet<Transaction>();
this.Transaction1 = new HashSet<Transaction>();
this.User_Wallet = new HashSet<User_Wallet>();
this.Wallet_Item = new HashSet<Wallet_Item>();
}
public int walletID { get; set; }
public string name { get; set; }
public virtual ICollection<Transaction> Transaction { get; set; }
public virtual ICollection<Transaction> Transaction1 { get; set; }
public virtual ICollection<User_Wallet> User_Wallet { get; set; }
public virtual ICollection<Wallet_Item> Wallet_Item { get; set; }
}
}
Thanks for helping us.
I had the same problem some time ago and the solution for this was:
The entity framework was returning a serialized class instead of normal class.
eg. Wallet_asfawfklnaewfklawlfkawlfjlwfejlkef instead of Wallet
To solve that you can add this code:
base.Configuration.ProxyCreationEnabled = false;
in your Context file.
Since the context file is auto generated you can add it in the Context.tt
In the Context.tt file it can be added around lines 55-65:
<#=Accessibility.ForType(container)#> partial class <#=code.Escape(container)#> : DbContext
{
public <#=code.Escape(container)#>()
: base("name=<#=container.Name#>")
{
base.Configuration.ProxyCreationEnabled = false;
<#
if (!loader.IsLazyLoadingEnabled(container))
{
#>
this.Configuration.LazyLoadingEnabled = false;
<#
Try specifying a setter for the properties, something like this :
[DataContract]
public partial class Wallet
{
[DataMember]
public int getwalletID { get { return walletID; } set { } }
[DataMember]
public string getname { get { return name; } set { } }
}
If it still doesn't work, you may consider creating an intermediate POCO class for this purpose, and use mapper library like AutoMapper or ValueInjecter to transfer the data from the EF objects.
The POCO class should have same properties as your EF class :
[DataContract]
public class WalletDTO
{
[DataMember]
public int walletID { get; set; }
[DataMember]
public string name { get; set; }
}
And modify your method to return this class instead :
public WalletDTO getWallet()
{
Wallet w = new Wallet(); // or get it from db using EF
var dto = new WalletDTO();
//assuming we are using ValueInjecter, this code below will transfer all matched properties from w to dto
dto.InjectFrom(w);
return dto;
}
Are you trying to recieve a IEnumerable<Wallets>? If - yes, please modify your server class that returns the IEnumerable by adding .ToArray() method
I want to bind my Entity Framework context to be scoped per NServicebus message. Would the following code successfully do that?
Bind<IDbContext>().To<MyContext>()
.InScope(x => x.Kernel.Get<IBus>().CurrentMessageContext.Id);
Background
I have a NServicebus service that has several IMessageHandlers that read IEvents off an MSMQ Queue.
Each handler converts the message and saves it to a MS SQL Database by way of a particular IRepository sitting over an Entity Framework context.
The repositories needed by each handler are injected via ninject using NServicebus.ObjectBuilder.Ninject
public class Product
{
public string Code { get; set; }
public Category Category { get; set; }
}
public class Category
{
public string Code { get; set; }
}
public class SampleContext : IDbContext
{
IDbSet<Product> Products { get; }
IDbSet<Category> Categories{ get; }
}
public class ProductRepository : IProductRepository
{
private IDbContext _context;
public ProductRepository(IDbContext ctx) { _context = ctx; }
public void Add(Product p)
{
_context.Products.Add(p);
_context.SaveChanges();
}
}
public class CategoryRepository : ICategoryRepository
{
private IDbContext _context;
public CategoryRepository (IDbContext ctx) { _context = ctx; }
public Category GetByCode(string code)
{
return _context.Categories.FirstOrDefault(x => x.Code == code);
}
}
public class AddProductMessageHandler : IMessageHandler<IAddProductEvent>
{
private IProductRepository _products;
private ICategoryRepository _categories;
public AddProductMessageHandler(IProductRepository p, ICategoryRepository c)
{
_products = p;
_categories = c;
}
public void Handle(IAddProductEvent e)
{
var p = new Product();
p.Code = e.ProductCode;
p.Category = _categories.GetByCode(e.CategoryCode);
_products.Add(p);
}
}
Issue
If the EF context is bound in Transient scope (default) then each bound repository in the handler has it's own instance of the context.
Bind<IDbContext>().To<SampleContext>();
This causes issues if I load an object from one repository and then save it via another.
Likewise, if it's bound in Singleton scope, then the same context is used by all repositories, but then it slowly fills up with tracked changes and goobles up all my ram (and gets slower and slower to boot).
Bind<IDbContext>().To<SampleContext>().InSingletonScope();
Question
Ideally I would like each message handler to have 1 EF context that all required repositories (of that handler) use to load and save entities.
Is scoping the context to the current messages Id property a safe/reliable/good way of doing this?
Bind<IDbContext>().To<SampleContext>()
.InScope(x => x.Kernel.Get<IBus>().CurrentMessageContext.Id);
See my blogpost here which describes the scoping apart from NSB 4.0
http://www.planetgeek.ch/2013/01/16/nservicebus-unitofworkscope-with-ninject/
If you have 3.0 you can look into the current develop branch and port the extension methods to your code. You only have to change the scope name.
I'm not familiar with EF Context so please disregard if the answer below does not make any sense.
If EF Context is similar to a NH ISession, then I think the better option is to use a UoW the same way as NH implementation.
You can read more about UoW here.
I have a problem with serialization composite class (using WCF Service).
here my class in namespace1 (it is not in service namespace) :
[DataContract]
public class UpData
{
[DataMember]
public double Version ;
public UpData()
{
this.Version = -1;
}
}
In my Service namespace (in interface) I deŃlare this procedure :
ArrayList GetDownloadPath(Dictionary<string,string> lib1, Dictionary<string,string> lib2);
ArrayList contains UpData objects.
I have error(
How will be right to send ArrayList of UpData objects? (may be specific DataContract?)
Thanks a lot!
I'm not sure if ArrayList is serializable by default. Using a generic list could solve your problem:
[OperationContract]
List<UpData> GetDownloadPath(Dictionary<string,string> lib1, Dictionary<string,string> lib2);
EDIT: I think you also need to specify a getter and setter for your Version property, i.e.
[DataContract]
public class UpData
{
[DataMember]
public double Version { get; set; }
public UpData()
{
this.Version = -1;
}
}
More info here.