Guice

问题 I´m using Guice to initalize a class with some arguments from a config file @Provides @Singleton RetryServiceCaller provideMaxRetryAttempts(@Named("config") JsonObject config) throws IOException { JsonObject retryDetails = config.getJsonObject("retry_details"); return new RetryServiceCaller(retryDetails.getInteger("maxRetryAttempts"), retryDetails.getInteger("upperBoundary"), retryDetails.getInteger("lowerBoundary"), retryDetails.getLong("multiplicationFactor"), retryDetails.getInteger(

问题 how to change/set a binding by a property/string given in a property/text file? in my case i want to implement a kind of "demo mode". In normal mode a property gives an url to an external service but if url is "demo" the binding of the according interface should be changed like this: normal: bind(SasDatenProvider.class).to(SasDataProviderHttpImpl.class); demo bind(SasDataProvider.class).to(SasDataProviderFileImpl.class); how to achieve that? thx in advance 回答1: You can use a method annotated

问题 Is it possible to bind Named instance based on the enclosing class? For ex: in the below sample, classes A and B will get DataStore instance injected. However, I need to have primary store as StoreA and secondary store as StoreB in the scope/context of class A but primary store as StoreC and secondary store as StoreD in the scope/context of class B. How can this be achieved? class A { @Inject public A(DataStore dataStore) { ... } } class B { @Inject public B(DataStore dataStore) { ... } }

问题 In my application (stand alone apache camel) i have to bind several beans (instances of pojos). Because those pojos could not be used directly (in java) but have to be used via bound references in urls i want to "register" all available beans in an enum. The beans are then bound like this: public class BeanRegistry extends JndiRegistry { public BeanRegistry() { for (Beans bean : Beans.values()) { try { this.bind(bean.name(), bean.clazz().newInstance()); } catch (InstantiationException |

问题 I have a resource that looks like this: @Path("/Resources/Console") public class ConsoleResource { @POST @Consumes({ MediaType.APPLICATION_JSON, MediaType.APPLICATION_XML }) @Produces({ MediaType.APPLICATION_JSON, MediaType.APPLICATION_XML }) public String post(/* */) { /* */ } } Whenever my JerseyServletModule is configured as follows, the services work: @Override protected void configureServlets() { bind(ConsoleResource.class); bind(MessageBodyReader.class).to(JacksonJsonProvider.class);

问题 Hello i want to inject annotation value to parameter. for example @BindingAnnotation @Target({ ElementType.FIELD, ElementType.PARAMETER}) @Retention(RetentionPolicy.RUNTIME) public @interface MyAnnotation { int value() default 0; } public class A { @Inject @MyAnnotation(30) protected Integer a; } how i can inject 30 inside the a variable. thank you very much 回答1: Use bindConstant() as bindConstant().annotatedWith(MyAnnotation.class).to(30); You can just have @Inject and @MyAnnotation

问题 How do I make the following work using Guice? // The Guice Module configuration void configure() { // The following won't compile because HelpTopicId is abstract. // What do I do instead? bind(new TypeLiteral<String>(){}). annotatedWith(new HelpTopicId("A")).toInstance("1"); bind(new TypeLiteral<String>(){}). annotatedWith(new HelpTopicId("B")).toInstance("2"); } public @interface HelpTopicId { public String helpTopicName(); } public class Foo { public Foo(@HelpTopicId("A") String helpTopicId

问题 Hi guys with my question. A GWT project, as i have read Gin i usable only on the client side than Guice is usable on the server side. Here is my question. Let first post some example code. Server side. public class WebchargeServiceImpl extends RemoteServiceServlet implements WebchargeService { @Inject private Injector injector; @Inject private ExecuteOperations executeOperations; ..... executeOperations.do(); .... Here is the injected class ExecuteOperations @Singleton public class

问题 I created an DataSourceProvider to look up container managed dataSource: public class ContainerDataSourceProvider implements Provider<DataSource> { private final DataSource ds; @Inject ContainerDataSourceProvider (String dataSourceName) throws NamingException { Context initCtx = new InitialContext(); Context envCtx = (Context) initCtx.lookup("java:comp/env"); ds = (DataSource) envCtx.lookup("jdbc/" + dataSourceName); } @Override public DataSource get() { return ds; } } I can't used @Named

问题 (This is basically a follow on this question.) I need to access the DB service layer in one of my form validators (to make sure the email is not already taken when registering a new user). I tried the following (some input-fields omitted for brevity): public class RegistrationPage extends WebPage { @Inject private UserService userService; public RegistrationPage() { add(new FeedbackPanel("feedback")); TextField<String> email = new TextField<String>("email", Model.of("")); ... email.add(new