proxy-classes | 易学教程

Why is Kotlin throw IllegalArgumentException when using Proxy

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问题 This is the Kotlin equivalent of Java code using InvocationHandler : override fun invoke(proxy: Any?, method: Method?, args: Array<out Any>?): Any { println("before httprequest--->" + args) val ret = method!!.invoke(obj, args) println("after httprequest--->") return ret } Java code: public Object invoke(Object o, Method method, Object[] args) throws Throwable { System.out.println("jdk--------->http" + args); Object result=method.invoke(target, args); System.out.println("jdk--------->http");

How the proxy instance pass itself to the InvocationHandler?

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问题 here is the method signature from the Proxy class: Object java.lang.reflect.Proxy.newProxyInstance(ClassLoader loader, Class<?>[] interfaces, InvocationHandler h) throws IllegalArgumentException I check the source code of the newProxyInstance in the Proxy Class, i couldn't find where the proxy object pass itself to the InvocationHandler method public Object invoke(Object proxy, Method method, Object[] args) throws Throwable; Does anyone know? Thanks 回答1: You're on the hook to provide the

Why is proxying deprecated?

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This question about how to extend a Scala collection led me to this answer , which extends from SetProxy rather than Set . But SetProxy has since been deprecated! The documentation says " (Since version 2.11.0) Proxying is deprecated due to lack of use and compiler-level support." Why has proxying not gotten use and compiler support? Does Scala provide a better technique for accomplishing the same thing? Was it found to have some fatal flaw? Proxying is deprecated because it is fragile. A proxy is supposed to forward all calls back to some other implementation. But what if you add a new method

Why is proxying deprecated?

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问题 This question about how to extend a Scala collection led me to this answer, which extends from SetProxy rather than Set . But SetProxy has since been deprecated! The documentation says " (Since version 2.11.0) Proxying is deprecated due to lack of use and compiler-level support." Why has proxying not gotten use and compiler support? Does Scala provide a better technique for accomplishing the same thing? Was it found to have some fatal flaw? 回答1: Proxying is deprecated because it is fragile. A

Why proxy is not used to autowire

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问题 I can not find any reason why every autowired bean are not autowired by proxy. I know that becasue @Transactional annotations do not work and I checked autowired component during debugging in eclipse. Of course every component implements some interface and I use @Autowired annotations in relation to the interface. I have only one configuration of aop: <tx:annotation-driven transaction-manager="transactionManager" /> I use JPA with hibernate, spring-mvc,spring-webflow, spring-security and

Right way to return proxy model instance from a base model instance in Django?

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Say I have models: class Animal(models.Model): type = models.CharField(max_length=255) class Dog(Animal): def make_sound(self): print "Woof!" class Meta: proxy = True class Cat(Animal): def make_sound(self): print "Meow!" class Meta: proxy = True Let's say I want to do: animals = Animal.objects.all() for animal in animals: animal.make_sound() I want to get back a series of Woofs and Meows. Clearly, I could just define a make_sound in the original model that forks based on animal_type, but then every time I add a new animal type (imagine they're in different apps), I'd have to go in and edit

Could multiple proxy classes make up a STL-proof bitvector?

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It's well known that std::vector<bool> does not satisfy the Standard's container requirements, mainly because the packed representation prevents T* x = &v[i] from returning a pointer to a bool. My question is: can this be remedied/mitigated when the reference_proxy overloads the address-of operator& to return a pointer_proxy? The pointer-proxy could contain the same data as the reference_proxy in most implementations, namely a pointer into the packed data and a mask to isolate the particular bit inside the block pointed to. Indirection of the pointer_proxy would then yield the reference_proxy.

NHibernate Get objects without proxy

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I am using NHibernate(2.0.1.4) with NHibernate.Linq(1.0.0.4) to get Objects of the type Node from the Database. When I get these objects, the last object of the collection I got is of the type Proxy (because I used "NHibernate.ByteCode.LinFu"" ) I used the following linq query: var mynodes = from node in session.Linq<Node>() where ancestorNodes.Contains(node.Id) select node).ToList() anchestorNodes is a list of Id's for the node objects to get. When I have 3 id's in the "ancestorNodes" list, the last object of the result (mynodes) I got from the query is of the type nodeProxy. How could this

Right way to return proxy model instance from a base model instance in Django?

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问题 Say I have models: class Animal(models.Model): type = models.CharField(max_length=255) class Dog(Animal): def make_sound(self): print "Woof!" class Meta: proxy = True class Cat(Animal): def make_sound(self): print "Meow!" class Meta: proxy = True Let's say I want to do: animals = Animal.objects.all() for animal in animals: animal.make_sound() I want to get back a series of Woofs and Meows. Clearly, I could just define a make_sound in the original model that forks based on animal_type, but

Dynamically generate classes at runtime in php?

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Here's what I want to do: $clsName = substr(md5(rand()),0,10); //generate a random name $cls = new $clsName(); //create a new instance function __autoload($class_name) { //define that instance dynamically } Obviously this isn't what I'm actually doing, but basically I have unknown names for a class and based on the name, I want to generate the class with certain properties etc. I've tried using eval() but it is giving me fits over private and $this-> references... //edit Ok, obviously my short and sweet "here's what I want to do" caused massive strife and consternation amongst those who may be