dependency-injection

问题 I am trying to use a custom model binder in MVC that I want resolved from my IoC container. The issue I am having is that I can't access my container while I am adding the MVC service, because my container isn't built yet (and I need to add MVC before building my container). Feels like a chicken/egg issue, and I am sure I am missing a simple solution. Example: services.AddMvc().AddMvcOptions(options => { options.ModelBinders.Add(serviceProvider.Resolve<CustomModelBinder>()); }); My custom

问题 This question is about Unity Container but I guess it is applicable to any dependency container. I have two classes with circular dependencies: class FirstClass { [Dependency] public SecondClass Second { get; set; } } class SecondClass { public readonly FirstClass First; public SecondClass(FirstClass first) { First = first; } } Technically it's possible to instantiate and correctly inject dependencies for both of them if treat them as singletons: var firstObj = new FirstClass(); var secondObj

问题 I am trying to use the Spring Framework IoC Container to create an instance of class ThreadPoolExecutor.CallerRunsPolicy. In Java, I'd do it this way... import java.util.concurrent.RejectedExecutionHandler; import java.util.concurrent.ThreadPoolExecutor; ... RejectedExecutionHandler rejectedExecutionHandler = new ThreadPoolExecutor.CallerRunsPolicy(); But when I try to do the equivalent in Spring, it throws a CannotLoadBeanClassException . <beans> <bean class="java.util.concurrent

问题 Can somebody show me how I would inject validator into a regular class using dependency injection. In my controller I have : use Symfony\Bundle\FrameworkBundle\Controller\Controller; use Form; class FormController extends Controller { public function indexAction() { $form = new Form(); $email = $request->request->get('email'); $valid = $form->isValid($email); } } and I want to use this custom class - but I need it got have access to validator. class Form { public function isValid($value) { //

问题 I'm starting to work with Dropwizard and I'm trying to create a Command that requires to use the database. If someone is wondering why I'd want to do that, I can provide good reasons, but this is not the point of my question anyway. It's about dependency inversion and Service initialization and run phases in Dropwizard. Dropwizard encourages to use its DbiFactory to build DBI instances but in order to get one, you need an Environment instance and/or the database configuration: public class

问题 I want to inject my Androidx fragments using dagger 2. In my activity I have: public class MainActivity extends AppCompatActivity implements HasSupportFragmentInjector { @Inject Reposetory reposetory; @Inject DispatchingAndroidInjector<androidx.fragment.app.Fragment> dispatchingAndroidInjector; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } @Override public AndroidInjector<androidx.fragment.app

问题 Friends, I have an issue in Java: I'd like to implement one structure but I'm facing some difficulty in doing it, can anyone help me. interface samp1{ method1() method2() method3() } interface samp2{ method4() method5() } class Samp implements samp1,samp2 { // this class needs only method1 from interface samp1 and method 4 from interface samp2 // I don't want to override all the methods from interface } can anyone propose some solutions for this? Is there any design pattern available for this

问题 I am trying to implement DI with Castle Windsor. Currently I have a controller with overloaded constructors like this (this is an antipattern as described here: https://www.cuttingedge.it/blogs/steven/pivot/entry.php?id=97): public class MyController : ApiController { protected IStorageService StorageService; protected MyController() { StorageService = StorageServiceFactory.CreateStorageService(User.Identity as ClaimsIdentity); } protected MyController(IStorageService storageService) {

问题 We inject simple property with configuration as shown below : <bean id="myService" class="com.aaa.bbb.ccc.MyServiceImpl"> <property name="myProp" value=""/> </bean> How would you do it with annotations? 回答1: Using the @Value annotation. It supports SpEL as well, which means you can load a properties file and have @Value("${someConfigurationProperty}") 来源： https://stackoverflow.com/questions/6630965/how-to-inject-string-property-in-a-spring-bean

问题 I' have a problem with injecting StoreBean into Restful service. I have reduecd code little bit to get a point. Here is the code(DataStoreBean): @Local(DataStore.class) @Stateless public class DataStoreBean implements DataStore { public String get() { return "works"; } } and here is code for RestEndpoint: @RequestScoped @Path("/DataStore") @Produces(MediaType.APPLICATION_JSON) @Consumes(MediaType.APPLICATION_JSON) public class DataStoreRestEndpoint { @EJB DataStoreBean dataStore; @GET @Path("