factory

问题 I need to build a lot of functions with lots of different arguments, though they otherwise share a lot of code and structure. To avoid duplication, I thought I'd be clever and build myself a function factory (aka closure). I can't figure out how to pass the function arguments inside the function factory . My use case is a bunch of S3 constructor functions, all of which share the same validation mechanism. So I'll use that as an example to explain my problem. Say, I have a ClassA and ClassB ,

问题 This question already has answers here : java.lang.IllegalStateException:Could not find backup for factory javax.faces.application.ApplicationFactory (3 answers) Closed 3 years ago . I want to migrate from jsf 2.1 to 2.2 but I can not run my server (Tomcat) to couse of the following error: (I'm yours to inform you that I used [Hibernate + Spring + JSF] in project Maven) `Root WebApplicationContext: initialization started Refreshing org.springframework.web.context.support

问题 Why LocalDate , LocalTime , Stream , etc. objects use a factory method of() instead of a constructor? I found an explanation of why a factory methods should be used instead of new here. This answer gives a number of reasons, but the only thing that is relevant to Java Date/Time API is the following: unlike constructors, they are not required to create a new object each time they’re invoked As LocalDate and LocalTime are immutable, it probably makes sense to use a factory and reuse existing

问题 I am developing a project with ZF2 and Doctrine. I am attempting to use Doctrine Hydrator in the form creation as shown in this tutorial. In this method, an ObjectManager object is created in the controller and passed to the new form when it is instantiated. Passing the ObjectManager object from the controller to the form creates a problem when I want to use ZF2's FormElementManager because ZF2 requires that I get an instance of the form class through the Zend\Form\FormElementManager instead

问题 I have an application with a factory service to allow construction of instances while resolving the necessary dependency injection. For instance, I use this to construct dialog view models. I have a service interface that looks like this: public interface IAsyncFactory { Task<T> Build<T>() where T: class, IAsyncInitialize; } Ideally, what I'd like to have is something like this (pseudo-syntax, as this isn't directly achievable) public interface IFactory { Task<T> Build<T>() where T: class,

问题 Has anyone ever combined the classic generic factory by Andrei Alexandrescu (page 208 of Chapter 8 in Modern C++ Design) with the 'multifunction' capabilities of Boost.TypeErasure? That is, the flexibility to have several creator function signatures that vary with respect to number and type of parameters (but still have the same return type and are known at compile time). In other words, how to combine this slightly simplified generic Factory: #include <map> #include <utility> #include

问题 I understand that one of the main advantages of the Factory Method over Simple Factory is that it doesn't violate the Open-Closed SOLID Principle. That is, the former doesn't require modifying the switch statement when new types are added. There is one piece on which I am hoping to get clarification. If I were to use a simple factory, I would have a factory like this (simplified): public class ObjectFactory { public static IObject CreateObject(ObjectTypeEnum objectType) { switch (objectType)

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 2 years ago . The arrival of Java 9 brings many new features to Java's Collections API, one of which being collection factory methods. What are they and how can I implement them properly? 回答1: Note 1: To prevent the use of raw-types, I have opted to provide a generic type for each class that I

问题 I'm new to angular and I'm creating a simple app. It navigates between projects, pulled in via JSON: http://plnkr.co/edit/FTfa1rcVaf85xTu65oSR?p=preview I am also using a factory, where I make a call such as get or getOne , so that it deals with the $http in one place, only calling it if the data hasn't already been fetched. This all works fine when you start on the home page, but when you start on an individual project page, both get and getOne are called at the same time, pulling in

问题 I'm new to angular and I'm creating a simple app. It navigates between projects, pulled in via JSON: http://plnkr.co/edit/FTfa1rcVaf85xTu65oSR?p=preview I am also using a factory, where I make a call such as get or getOne , so that it deals with the $http in one place, only calling it if the data hasn't already been fetched. This all works fine when you start on the home page, but when you start on an individual project page, both get and getOne are called at the same time, pulling in