stateless

Everyone says that it uses stateless components will improve application performance. I noticed, however, that the use of stateless component in the wrong place can really reduce application performance. This happens because the stateless components, render always, even if the properties have not changed . In the case of stateful components we can use PureComponent , PureRenderMixin or implement own shouldComponentUpdate - thanks it noticed a big Increase in application performance when compared to stateless components. I wanted to ask if there is some way to implementation something like

基本概念： 有状态就是有数据存储功能。有状态对象(Stateful Bean)，就是有实例变量的对象 ，可以保存数据，是非线程安全的。在不同方法调用间不保留任何状态。 无状态就是一次操作，不能保存数据。无状态对象(Stateless Bean)，就是没有实例变量的对象 .不能保存数据，是不变类，是线程安全的。 代码更好理解： Java代码 public class StatefulBean { public int state; // 由于多线程环境下，user是引用对象，是非线程安全的 public User user; public int getState() { return state; } public void setState( int state) { this .state = state; } public User getUser() { return user; } public void setUser(User user) { this .user = user; } } public class StatelessBeanService { // 虽然有billDao属性，但billDao是没有状态信息的，是Stateless Bean. BillDao billDao; public BillDao getBillDao() { return

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: I am fairly new to using JAX-RS. The tutorials I went through made it really simple by showing how to make GET/POST/DELETE requests. But did not go through advanced annotations. Now I am reading the Java EE 7 essentials book. I am confused with many new annotations that I see here. I tried to find the utility of these annotations. but I did not understand. I have always found SO answers to be easily understandable for beginners. Here is the code from github : Employee.Java @Entity @Table ( name = "REST_DB_ACCESS" ) @NamedQueries ({

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I try to access some refs in my component. But I have this error in the console. withRouter.js:44 Warning: Stateless function components cannot be given refs (See ref "pseudo" in FormInputText created by RegisterForm). Attempts to access this ref will fail. Here is my component: class RegisterForm extends React.Component { render() { return ( <form action=""> <FormInputText ref="pseudo" type="text" defaultValue="pseudo"/> <input type="button" onClick={()=>console.log(this.refs);} value="REGISTER"/> </form> ); } } Plus when I click on the

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: Is there any relationship between stateful session bean and HTTP session ? What are the use cases where we would require a stateful session bean and what use cases requires HTTP Session. Can i expose a stateful session bean as a restful web service ? 回答1: HTTP is a stateless protocol Which means that it is actual transport protocol between the server and the client -- is "stateless because it remembers nothing between invocations Now First read this what is HTTPSession and what is Session Bean (keep in mind that session beans are use to

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: I am using Netbeans and am experimenting with EJBs. I have two projects (2 separate applications) 1- A Java ME Project called EnterpriseApp 2- A standard Java SE Project called Test Now here is what I did - in EnterpriseApp I generated a stateless EJB called TestEJB with both local and remote interfaces. For the remote project selection I selected the Test App. In short the bean code looks like this @Stateless public class TestEjb implements TestEjbRemote , TestEjbLocal { @Override public String Try () { return "Hello World" ; } }

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I'm using Laravel Socialite to add a Facebook connect button on a website. Sometimes, I've got this error on callback: exception 'Laravel\Socialite\Two\InvalidStateException' in /example/vendor/laravel/socialite/src/Two/AbstractProvider.php:161 I don't know what it mean and did not found anything yet about this error. The real problem is it seems to be a random exception (don't understood why it happens). So what this error means and how to avoid it? It seems it's not the same problem as Laravel 5 geting InvalidStateException in

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I have this: const ProjectsSummaryLayout = ({projects}) => { return ( <div className="projects-summary col-md-10"> <h3>Projects</h3> <ul> { projects.map(p => <li key={p.id}>{p.contract.client}</li>) } </ul> </div> ) } const ProjectsSummary = connect( state => ({projects: state.projects}) )(ProjectsSummaryLayout) and I get: Warning: Stateless function components cannot be given refs (See ref "wrappedInstance" in ProjectsSummaryLayout created by Connect(ProjectsSummaryLayout)). Attempts to access this ref will fail. What is it trying to tell