dependency-injection

问题 I would like to use @Value on a property but I always get 0 (on int). But on a constructor parameter it works. Example: @Component public class FtpServer { @Value("${ftp.port}") private int port; public FtpServer(@Value("${ftp.port}") int port) { System.out.println(port); // 21, loaded from the application.properties. System.out.println(this.port); // 0??? } } The object is spring managed, else the constructor parameter wouldn't work. Does anyone know what causes this weird behavior? 回答1:

问题 Say I have a source and destination class that is mapped using AutoMapper. The destination has a logger service injected into the constructor. However, I don't know how to get the service injected into the constructor through StructureMap? I've tried the following: Mapper.Initialize(m => { m.ConstructServicesUsing(ObjectFactory.GetInstance); }); which didn't prevent me having the exception on the mapping call, I guess because the service isn't being injected in properly. I also tried the

问题 In order to learn Dagger 2 i decided to rewrite my application but I'm stuck with finding the proper solution for the following problem. For the purpose of this example let's assume we have an interface called Mode : public interface Mode { Object1 obj1(); //some other methods providing objects for app } and two implementations: NormalMode and DemoMode . Mode is stored in singleton so it could be accessed from anywhere within application. public enum ModeManager { INSTANCE,; private Mode mode

问题 This question already has answers here : Is there a pattern for initializing objects created via a DI container (5 answers) Closed 4 years ago . I'm working on a project in which my constructors contain - only - behavioral dependencies. i.e. I never pass values / state. Example: class ProductProcessor : IProductProcessor { public double SomeMethod(){ ... } } class PackageProcessor { private readonly IProductProcessor _productProcessor; private double _taxRate; public PackageProcessor

问题 Can someone please provide me a simple example of DI and IoC ? I understand the first one but was unable to get an implementation of the second one. I'm working with MVC 3 and I really want to use the IDependencyResolver, but I can't understand how. Is ninject an option or is it required? Is there a tutorial like nerdDinner and I wasn't able to find it? Can somebody give me a link to study it? 回答1: In order to grok real world DI and its patterns and anti-patterns quickly, I recommend getting

问题 We are using Ninject in our MVC3 project to do dependency injection. I used NuGet to add package references to Ninject and Ninject.MVC3 packages. When I did this it created a NinjectMVC3 class in my App_Start folder: public static class NinjectMVC3 { private static readonly Bootstrapper bootstrapper = new Bootstrapper(); public static void Start() { DynamicModuleUtility.RegisterModule(typeof(OnePerRequestModule)); DynamicModuleUtility.RegisterModule(typeof(HttpApplicationInitializationModule)

问题 I have a tree of Zone objects: class Zone { protected $parent; public function __construct(Zone $parent) { $this->parent = $parent; } } There are no children nor descendants property in the Zone, because I want to avoid the pain of managing these relationships in the domain model. Instead, a domain service maintains a closure table in the database, to map a zone to all its descendants, at any level. Now, I have a User which can be assigned one or more Zones: class User { protected $zones;

问题 I've spent the last several hours trying to find an answer to the "best", most logical, etc way to write a php database class to simultaneously connect to one postgresql db and one mysql db. Also, I'd like to adopt a Dependency Injection design but am new to that whole concept. So far I've come up with... class Database { public function PgSqlConnect() { /* Connect to database */ $host = 'localhost'; $dbname = '---'; $user = '---'; $pass = '---'; $timeout = 5; /* seconds */ try { $pgsql_dbh =

问题 When my application starts, I have a bunch of modules (module1, module2 …). For each of this module I have a bunch of controller actions : /myModuleController/module1/action1 /myModuleController/module1/action2 /myModuleController/module2/action1 /myModuleController/module2/action2 … As the user can log himself once per module, I deploy an authentication middleware per module, which is simply done this way : app.UseWhen((context) => context.Request.Path.StartsWithSegments(urlPath), appbuilder

问题 When my application starts, I have a bunch of modules (module1, module2 …). For each of this module I have a bunch of controller actions : /myModuleController/module1/action1 /myModuleController/module1/action2 /myModuleController/module2/action1 /myModuleController/module2/action2 … As the user can log himself once per module, I deploy an authentication middleware per module, which is simply done this way : app.UseWhen((context) => context.Request.Path.StartsWithSegments(urlPath), appbuilder