dependency-injection

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed last year . There used to be a how-to in the symfony2 doc on how to create a service (my_mailer) but I can't seem to find it anywhere. Can anyone tell me where to find it, or some other tutorial on how to create a service in symfony2 ? 回答1: Service Container - http://symfony.com/doc/current/book/service_container.html

问题 I am upgrading my Play application from 2.5.12 to 2.5.18 and when I start up the application (using sbt ), I am receiving this error: CreationException: Unable to create injector, see the following errors: 1) Error injecting constructor, java.lang.NullPointerException at modules.OnStart.<init>(OnStart.java:15) at modules.Global.configure(Global.java:9) (via modules: com.google.inject.util.Modules$OverrideModule -> modules.Global) while locating modules.OnStart 1 error The rest of the error is

问题 I'm using Gulp to build my main javascript file (app.js) for an AngularJS application. Everything is working fine except for one small thing that is bothering me. I am using ng-annotate to automatically parse my angular js and add dependency injection syntax. So I went from this (manual injection without using ng-annotate): angular.module('base.controllers') .controller('RandomeCtrl', ['$scope', '$routeParams', ..., function($scope, $routeParams, ...) { To this (code that will be modified

问题 I have this class hierarchy: public interface ISR { } public interface ICU { } public interface IFI { } public class CU : ICU { } public class SR : ISR { public SR(IFI fi) { FI = fi; } public IFI FI { get; set; } } public class FI : IFI { public FI(ISR sr, ICU cu) { SR = sr; CU = cu; } public ISR SR { get; set; } public ICU CU { get; set; } } public class Module : NinjectModule { public override void Load() { Bind<ISR>().To<SR>(); Bind<ICU>().To<CU>(); Bind<IFI>().To<FI>(); } } class Program

问题 I know spring has it's own object factories for JPA but I want to just get this working as is... From there I will investigate best practice. I am just in the understanding process. This is the actual code I am trying to produce beans for: EntityManagerFactory emf = Persistence.createEntityManagerFactory("test"); EntityManager em = emf.createEntityManager(); What I have to get it working (but isn't working) ( Edit : note myFactoryBean compiles without issue emf is the culprit): <?xml version=

问题 Using Asp.Net Core we can make use of Dependency Injection in controllers/repositories. However, I wish do do some logging in my Entity Class. class Person { private ILogger<Person> _logger; private List<Pets> pets; public Person(ILogger<Person> logger) { _logger = logger; } public bool HasCat() { _logger.LogTrace("Checking to see if person has a cat."); // logic to determine cat ownership hasCat = true; return hasCat; } } When the Person class is instantiated by EntityFramework it does not

问题 I have search far and wide for a simple example of how to configure a DryIoc container to simply inject dependencies as properties the same way that it injects constructor args. Given the following working example... Container registration: public static void Register(HttpConfiguration config) { var c = new Container().WithWebApi(config); c.Register<IWidgetService, WidgetService>(Reuse.Singleton); c.Register<IWidgetRepository, WidgetRepository>(Reuse.Singleton); } Widget Service: public class

问题 I have semantic configuration for a bundle that needs to be interpreted during a compiler pass for the same bundle. Is it possible to access it without storing it in an intermediate container variable? 回答1: Yes, kind of: <?php namespace Acme\DemoBundle\DependencyInjection; use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface; use Symfony\Component\DependencyInjection\ContainerBuilder; class CompilerPass implements CompilerPassInterface { public function process

问题 Why do I have to annotate a Dagger component with the scopes it's going to use? Why is it not enough to annotate the class itself? 回答1: Because scopes by themselves don't mean anything. It's the components and their relationships that introduce meaning to scopes. Unscoped objects can be provided from any component if their dependencies are available. Since they are unscoped there will be a new object created every time that you call their provider. A scoped object will share the lifecycle of

问题 I'm currently trying to figure out Dagger 2. I am trying to set up 4 scopes: App, User, Activity, Fragment. User and Activity components are Subcomponents of App. Fragment is a Component with Activity as its dependency. Say my UserSettingsActivity needs a Toolbar (provided by ActivityModule), and a UserProfile (provided by UserModule). I won't get a UserProfile until I ask for it from the database, whereas the Toolbar can be provided right away. So the order of injection that takes place is