I have created Oracle service with #CordaService annotation
I am getting Exception while installing Corda Service.
It will not get defined service type, got size 0 in List object in first argument of constructor.
public NumberVerifierOracle(PluginServiceHub services){
this(services.getMyInfo().serviceIdentities(NumberVerifierOracleType.getNumberVerifierOracleType().getServiceType()).get(0),services);
}
The defined service type is:
public class NumberVerifierOracleType {
private static ServiceType serviceType;
private static NumberVerifierOracleType numberVerifierOracleType = new NumberVerifierOracleType();
private NumberVerifierOracleType(){
serviceType = ServiceType.Companion.getServiceType("com.template.oracle.service","numberVerifierService_NumberVerifierOracle");
}
public static NumberVerifierOracleType getNumberVerifierOracleType() {
return numberVerifierOracleType;
}
public ServiceType getServiceType() {
return serviceType;
}
}
The Package hierarchy is:
com.template.oracle.service.NumberVerifierOracle class
I have resolved this error by making service with Public modifier.
Like this:
public static ServiceType type;
static{
type= NumberVerifierOracleType.getNumberVerifierOracleType().getServiceType();
}
It will not work if we have private modifier and use directly getter method.
Related
I have created a asp.net web api project and implemented the below HTTP GET method in AccountController and the related service method & repository method in AccountService & AccountRepository respectively.
// WEB API
public class AccountController : ApiController
{
private readonly IAccountService _accountService;
public AccountController(IAccountService accountService)
{
_accountService = accountService;
}
[HttpGet, ActionName("UserProfile")]
public JsonResult<decimal> GetUserSalary(int userID)
{
var account = _accountService.GetUserSalary(userID);
if (account != null)
{
return Json(account.Salary);
}
return Json(0);
}
}
Service / Business Layer
public interface IAccountService
{
decimal GetUserSalary(int userId);
}
public class AccountService : IAccountService
{
readonly IAccountRepository _accountRepository = new AccountRepository();
public decimal GetUserSalary(int userId)
{
return _accountRepository.GetUserSalary(userId);
}
}
Repository / Data Access Layer
public interface IAccountRepository
{
decimal GetUserSalary(int userId);
}
public class AccountRepository : IAccountRepository
{
public decimal GetUserSalary(int userId)
{
using (var db = new AccountEntities())
{
var account = (from b in db.UserAccounts where b.UserID == userId select b).FirstOrDefault();
if (account != null)
{
return account.Salary;
}
}
return 0;
}
}
UnityConfig
public static class UnityConfig
{
public static void RegisterComponents()
{
var container = new UnityContainer();
container.RegisterType<IAccountService, AccountService>();
container.RegisterType<IAccountRepository, AccountRepository>();
GlobalConfiguration.Configuration.DependencyResolver = new UnityDependencyResolver(container);
}
}
But when I invoke the API method GetUserSalary() I get an error saying
An error occurred when trying to create a controller of type 'AccountController'. Make sure that the controller has a parameterless public constructor.
Check that you did not forget to register Unity IoC container itself:
if you use ASP.NET Framework it could be - Global.asax or Startap.cs (Owin) via UnityConfig.RegisterComponents() method.
if you use ASP.NET Core then in the Startup.cs file (I was unable to find official guides for its configuting)
Your current constructor has parameters (or args if you prefer).
see:
public AccountController(IAccountService accountService)
{
_accountService = accountService;
}
All you need to do is add a "Parameter-less Constructor" into the controller as well.
public AccountController()
{
}
Parameter-less constructors are usually above the ones that have params, though as far as I am aware this is only due to standards not any actual effect(s) it may cause.
There is also an already existing issue/question similar to this I will link below that may provide further details.
Make sure that the controller has a parameterless public constructor error
I've decided to use a request scoped container managed EntityManager and I've created a producer for that reason:
#RequestScoped
public class EntityManagerProducer {
#PersistenceContext(unitName = "PU", type = PersistenceContextType.TRANSACTION)
private EntityManager entityManager;
#Produces
public EntityManager getEntityManager() {
return entityManager;
}
}
I've got two EJB's that expose a remote client view:
#Remote
public interface EJB1 {
void createPerson(int id, String firstName, String lastName);
}
#Remote
public interface EJB2 {
void containsEntity(Person person);
}
#Stateless
public class EJB1Impl implements EJB1 {
#Inject
private EntityManager entityManager;
#EJB
private EJB2 ejb2;
#Override
public void createPerson(final int id, final String firstName, final String lastName) {
Person person = new Person();
person.setId(id);
person.setFirstName(firstName);
person.setLastName(lastName);
entityManager.persist(person);
System.out.println("EJB1Impl: persistence context contains entity: " + entityManager.contains(person));
ejb2.containsEntity(person);
}
}
#Stateless
public class EJB2Impl implements EJB2 {
#Inject
private EntityManager entityManager;
#Override
public void containsEntity(final Person person) {
System.out.println("EJB2Impl: PersistenceContext contains entity: " + entityManager.contains(entity));
person.setLastName("new name");
//entityManager.merge(person);
}
}
The EJB's are deployed on WildFly 10. I access them by a remote client using this tutorial. The current version throws this exception: org.jboss.weld.context.ContextNotActiveException: WELD-001303 No active contexts for scope type javax.enterprise.context.RequestScoped. If I remove the #RequestScoped annotation from the producer, I don't get an exception but the EntityManager injected into the second EJB returns false when asked if it contains the entity and if I want the changes made to the entity (the change of the last name) to have any effect, I have to call entityManager.merge(person), which apparently means that the entity is detached. I'm sure that the second EJB executes withing the same transaction because if I inject an EJBContext and call setRollbackOnly() the transaction started in EJB1 is rolled back and a new person is not inserted into the data base.
The documentation of javax.enterprise.context.RequestScoped says that the request scope is active during any remote method invocation of any EJB, so what gives? How can I share an EntityManager during a request across multiple EJB's
I am using unity, entity framework 4 with POCO classes, repository pattern for DAL and services for Business Logic control.
I also want to use Unit of Work so I can package together CRUD operations which I perform on different services and then commit them all together.
My question is what would be the proper way to inject the Unit Of Work mechanism into my application using Microsoft Unity?
I understand that I can put the IUnitOfWork together with the repository on the constructor of the proper service and then if Unity mapping is specified it would auto initiate the proper instances, but this way I do not pass the global unit of work but rather create a new instance on each level, which can't be a smart way to do it (actually the repository is initiated even before the service).
What am I missing? (Attached is constructor code as I wrote it now of service and its repository).
U also understand that I can use Unity's ParameterOverrides method to take some global instance of Unit of Work (lets say from my aspx.cs file) and pass it into the service and then into the repository. But it seems a bit lame. Is this my only option?
Thanks
public class GenericRepository<T> : IUnitOfWorkRepository, IGenericRepository<T> where T : BaseEntity, IAggregateRoot
{
private IUnitOfWork _uow;
/// <summary>
/// Returns the active object context
/// </summary>
private ObjectContext ObjectContext
{
get
{
return ObjectContextManager.GetObjectContext();
}
}
public GenericRepository(IUnitOfWork uow)
{
_uow = uow;
}
//blahhhh...
public void Add(T entity)
{
_uow.RegisterNew(entity, this);
}
public void Delete(T entity)
{
_uow.RegisterRemoved(entity, this);
}
//.....blah blah....
public void PersistCreationOf(IAggregateRoot entity)
{
this.ObjectContext.AddObject(GetEntitySetName(), entity);
}
public void PersistUpdateOf(IAggregateRoot entity)
{
// Do nothing as EF tracks changes
}
public void PersistDeletionOf(IAggregateRoot entity)
{
this.ObjectContext.DeleteObject(entity);
}
}
public class CategoryRepository : GenericRepository<XComSolutions.FB.Domain.Model.Entities.Category>, ICategoryRepository
{
public CategoryRepository(IUnitOfWork uow)
: base(uow)
{ }
}
public class CategoryService : ICategoryService
{
public int myID {get; set;}
private ICategoryRepository _categoryRepository;
private IUnitOfWork _uow;
public CategoryService(ICategoryRepository categoryRepository,
IUnitOfWork uow)
{
_categoryRepository = categoryRepository;
_uow = uow;
}
public List<Category> GetAll()
{
return _categoryRepository.GetAll();
}
}
Define an IUnitOfWorkFactory and inject that in your services:
public class Service
{
private readonly IUnitOfWorkFactory factory;
public Service(IUnitOfWorkFactory factory)
{
this.factory = factory;
}
public void DoOperation()
{
using (UnitOfWork context = this.factory.CreateNew())
{
this.DoSomeStuff(context);
this.DoMoreStuff(context);
context.SubmitChanges();
}
}
}
What I think you need to do is to define unit of work factory. You register this factory with your DI container and you resolve for this factory every time you need your unit of work. Then you get unit of work from the factory, work with it and let it go. You often will see that you need your unit of work within a scope of single method or single class. This article discuss Unit of Work pattern in connection with Entity Framework: http://msdn.microsoft.com/en-us/magazine/dd882510.aspx
I am new to WCF i am using constructor in my WCF service.svc.cs file....It throws this error when i use the constructor
The service type provided could not be loaded as a service because it does not have a default (parameter-less) constructor.
To fix the problem, add a default constructor to the type, or pass an instance of the type to the host.
When i remove the constructor its working fine....But its compulsory that i have to use constructor...
This is my code
namespace UserAuthentication
{
[ServiceBehavior(InstanceContextMode=System.ServiceModel.InstanceContextMode.Single)]
public class UserAuthentication : UserRepository,IUserAuthentication
{
private ISqlMapper _mapper;
private IRoleRepository _roleRepository;
public UserAuthentication(ISqlMapper mapper): base(mapper)
{
_mapper = mapper;
_roleRepository = new RoleRepository(_mapper);
}
public string EduvisionLogin(EduvisionUser aUser, int SchoolID)
{
UserRepository sampleCode= new UserRepository(_mapper);
sampleCode.Login(aUser);
return "Login Success";
}
}
}
can anyone provide ideas or suggestions or sample code hw to resolve this issue...
You could add something like (if possible):
public UserAuth() : this(SqlMapperFactory.Create())
{
}
Previously I was not using an interface for my generic repository. When I extracted the interface from my generic repository, I added two constructors: a parameterless and a parameterized constructors I am getting the following error:
{"Resolution of the dependency failed, type = \"NascoBenefitBuilder.Controllers.ODSController\", name = \"(none)\".
Exception occurred while: while resolving.
Exception is: InvalidOperationException - The current type, ControllerLib.Models.Generic.IGenericRepository, is an interface and cannot be constructed. Are you missing a type mapping?
-----------------------------------------------
At the time of the exception, the container was:
Resolving NascoBenefitBuilder.Controllers.ODSController,(none)
Resolving parameter \"repo\" of constructor NascoBenefitBuilder.Controllers.ODSController(ControllerLib.Models.Generic.IGenericRepository repo)
Resolving ControllerLib.Models.Generic.IGenericRepository,(none)"}
My Controller at the beginning:
public class ODSController : ControllerBase
{
IGenericRepository _generic = new GenericRepository();
}
After extracting the interface and use it in controller:
public class ODSController : ControllerBase
{
IGenericRepository _generic;
public ODSController() : this(new GenericRepository())
{
}
public ODSController(IGenericRepository repo)
{
_generic = repo;
}
}
When I use parameterized constructor it is throwing error mentioned above.
Can anyone help me to overcome this problem?
You no longer need the default constructor:
public class ODSController : ControllerBase
{
private readonly IGenericRepository _repository;
public ODSController(IGenericRepository repository)
{
_repository = repository;
}
}
And then make sure you've properly configured your Unity container:
IUnityContainer container = new UnityContainer()
.RegisterType<IGenericRepository, GenericRepository>();
And that you are using the Unity controller factory in Application_Start:
ControllerBuilder.Current.SetControllerFactory(typeof(UnityControllerFactory));