CDI @Conversation 未通过handleNavigation() 传播

发布于 2024-10-10 14:09:46 字数 5360 浏览 3 评论 0原文

当我通过 handleNavigation() 方法重定向视图时，我遇到了长时间运行的对话的传播问题。这是我的测试代码：

我有一个 conversationscoped bean 和两个视图：

在浏览器中使用 URL 调用 conversationStart.xhtml

http://localhost/tests/conversationStart.jsf?paramTestId=ParameterInUrl

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
   "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
   <html xmlns="http://www.w3.org/1999/xhtml"
         xmlns:h="http://java.sun.com/jsf/html"
         xmlns:f="http://java.sun.com/jsf/core">
   
   <f:metadata>
       <f:viewParam name="paramTestId" value="#{conversationTest.fieldTestId}" />
       <f:event type="preRenderView" listener="#{conversationTest.preRenderView}" />
   </f:metadata>
   <h:head>
     <title>Conversation Test</title>
   </h:head>
   <h:body>
     <h:form>
       <h2>Startpage Test Conversation with Redirect</h2>
       <h:messages />
       <h:outputText value="Testparameter: #{conversationTest.fieldTestId}"/><br />
       <h:outputText value="Logged In: #{conversationTest.loggedIn}"/><br />
       <h:outputText value="Conversation ID: #{conversationTest.convID}"/><br />
       <h:outputText value="Conversation Transient: #{conversationTest.convTransient}"/><br />
       <h:commandButton action="#{conversationTest.startLogin}" value="Login ->" rendered="#{conversationTest.loggedIn==false}" /><br />
       <h:commandLink action="/tests/conversationLogin.xhtml?faces-redirect=true" value="Login ->" rendered="#{conversationTest.loggedIn==false}" /><br />
     </h:form>
     <h:link outcome="/tests/conversationLogin.xhtml" value="Login Link" rendered="#{conversationTest.loggedIn==false}">
      <f:param name="cid" value="#{conversationTest.convID}"></f:param>
     </h:link>
   </h:body>
</html>

参数写入 beanfield 并正确显示在视图中。有 3 种不同的可能性可以导航到下一个视图。所有 3 个都工作正常。 beanfield 也显示下一个视图 (conversationLogin.xhtml)：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
   "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
   <html xmlns="http://www.w3.org/1999/xhtml"
         xmlns:h="http://java.sun.com/jsf/html"
         xmlns:f="http://java.sun.com/jsf/core">
 
   <h:head>
     <title>Conversation Test</title>
   </h:head>
   <h:body>
     <h:form>
       <h2>Loginpage Test Conversation with Redirect</h2>
       <h:messages />
       <h:outputText value="Testparameter: #{conversationTest.fieldTestId}"/><br />
       <h:outputText value="Logged In: #{conversationTest.loggedIn}"/><br />
       <h:outputText value="Conversation ID: #{conversationTest.convID}"/><br />
       <h:outputText value="Conversation Transient: #{conversationTest.convTransient}"/><br />
       <h:commandButton action="#{conversationTest.login}" value="Login And Return" /><br />
     </h:form>
   </h:body>
</html>

当我通过单击按钮返回起始页时，对话 bean 仍然包含所有值。所以一切都很好。这是 bean：

package test;

import java.io.Serializable;

import javax.annotation.PostConstruct;
import javax.enterprise.context.Conversation;
import javax.enterprise.context.ConversationScoped;
import javax.faces.event.ComponentSystemEvent;
import javax.inject.Inject;
import javax.inject.Named;

@Named
@ConversationScoped
public class ConversationTest implements Serializable{

 private static final long serialVersionUID = 1L;

 final String CONVERSATION_NAME="longRun";
 
 @Inject Conversation conversation;
 
 private boolean loggedIn;
 private String fieldTestId;

 @PostConstruct
 public void init(){
  if(conversation.isTransient()){
   conversation.begin(CONVERSATION_NAME);
   System.out.println("New Conversation started");
  }
  loggedIn=false;
 }
 
 public String getConvID(){
  return conversation.getId();
 }
 public boolean isConvTransient(){
  return conversation.isTransient();
 }
 
 public boolean getLoggedIn(){
  return loggedIn;
 }
 
 public String startLogin(){
  return "/tests/conversationLogin.xhtml?faces-redirect=true";
 }
 
 public String login(){
  loggedIn=true;
  return "/tests/conversationStart.xhtml?faces-redirect=true";
 }
 
 public void preRenderView(ComponentSystemEvent ev) {
//  if(!loggedIn){
//   System.out.println("Will redirect to Login");
//   FacesContext ctx = FacesContext.getCurrentInstance();
//   ctx.getApplication().getNavigationHandler().handleNavigation(ctx, null, "/tests/conversationLogin.xhtml?faces-redirect=true");
//            ctx.renderResponse();
//  }
 }

 public void setFieldTestId(String fieldTestId) {
  System.out.println("fieldTestID was set to: "+fieldTestId);
  this.fieldTestId = fieldTestId;
 }

 public String getFieldTestId() {
  return fieldTestId;
 }

}

现在问题来了

一旦我尝试在 bean 的 preRenderView 方法中重定向页面（只需取消注释方法中的代码），使用 handleNavigation() 在下一个视图中再次创建 bean，而不是使用已创建的实例。尽管 cid 参数会传播到下一个视图！

有人知道出了什么问题吗？

此致托马斯

原文

I have a problem with the propagation of a long running conversation when I redirect the view by the handleNavigation() method. Here is my test code:

I have a conversationscoped bean and two views:

conversationStart.xhtml is called in Browser with URL

http://localhost/tests/conversationStart.jsf?paramTestId=ParameterInUrl

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
   "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
   <html xmlns="http://www.w3.org/1999/xhtml"
         xmlns:h="http://java.sun.com/jsf/html"
         xmlns:f="http://java.sun.com/jsf/core">
   
   <f:metadata>
       <f:viewParam name="paramTestId" value="#{conversationTest.fieldTestId}" />
       <f:event type="preRenderView" listener="#{conversationTest.preRenderView}" />
   </f:metadata>
   <h:head>
     <title>Conversation Test</title>
   </h:head>
   <h:body>
     <h:form>
       <h2>Startpage Test Conversation with Redirect</h2>
       <h:messages />
       <h:outputText value="Testparameter: #{conversationTest.fieldTestId}"/><br />
       <h:outputText value="Logged In: #{conversationTest.loggedIn}"/><br />
       <h:outputText value="Conversation ID: #{conversationTest.convID}"/><br />
       <h:outputText value="Conversation Transient: #{conversationTest.convTransient}"/><br />
       <h:commandButton action="#{conversationTest.startLogin}" value="Login ->" rendered="#{conversationTest.loggedIn==false}" /><br />
       <h:commandLink action="/tests/conversationLogin.xhtml?faces-redirect=true" value="Login ->" rendered="#{conversationTest.loggedIn==false}" /><br />
     </h:form>
     <h:link outcome="/tests/conversationLogin.xhtml" value="Login Link" rendered="#{conversationTest.loggedIn==false}">
      <f:param name="cid" value="#{conversationTest.convID}"></f:param>
     </h:link>
   </h:body>
</html>

The Parameter is written to the beanfield and displayed in the view correctly. There are 3 different possibilities to navigate to the next View. All 3 work fine. The beanfield shows up the next view (conversationLogin.xhtml) too:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
   "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
   <html xmlns="http://www.w3.org/1999/xhtml"
         xmlns:h="http://java.sun.com/jsf/html"
         xmlns:f="http://java.sun.com/jsf/core">
 
   <h:head>
     <title>Conversation Test</title>
   </h:head>
   <h:body>
     <h:form>
       <h2>Loginpage Test Conversation with Redirect</h2>
       <h:messages />
       <h:outputText value="Testparameter: #{conversationTest.fieldTestId}"/><br />
       <h:outputText value="Logged In: #{conversationTest.loggedIn}"/><br />
       <h:outputText value="Conversation ID: #{conversationTest.convID}"/><br />
       <h:outputText value="Conversation Transient: #{conversationTest.convTransient}"/><br />
       <h:commandButton action="#{conversationTest.login}" value="Login And Return" /><br />
     </h:form>
   </h:body>
</html>

When I return to the Startpage by clicking the button the conversation bean still contains all values. So everything is fine. Here is the bean:

package test;

import java.io.Serializable;

import javax.annotation.PostConstruct;
import javax.enterprise.context.Conversation;
import javax.enterprise.context.ConversationScoped;
import javax.faces.event.ComponentSystemEvent;
import javax.inject.Inject;
import javax.inject.Named;

@Named
@ConversationScoped
public class ConversationTest implements Serializable{

 private static final long serialVersionUID = 1L;

 final String CONVERSATION_NAME="longRun";
 
 @Inject Conversation conversation;
 
 private boolean loggedIn;
 private String fieldTestId;

 @PostConstruct
 public void init(){
  if(conversation.isTransient()){
   conversation.begin(CONVERSATION_NAME);
   System.out.println("New Conversation started");
  }
  loggedIn=false;
 }
 
 public String getConvID(){
  return conversation.getId();
 }
 public boolean isConvTransient(){
  return conversation.isTransient();
 }
 
 public boolean getLoggedIn(){
  return loggedIn;
 }
 
 public String startLogin(){
  return "/tests/conversationLogin.xhtml?faces-redirect=true";
 }
 
 public String login(){
  loggedIn=true;
  return "/tests/conversationStart.xhtml?faces-redirect=true";
 }
 
 public void preRenderView(ComponentSystemEvent ev) {
//  if(!loggedIn){
//   System.out.println("Will redirect to Login");
//   FacesContext ctx = FacesContext.getCurrentInstance();
//   ctx.getApplication().getNavigationHandler().handleNavigation(ctx, null, "/tests/conversationLogin.xhtml?faces-redirect=true");
//            ctx.renderResponse();
//  }
 }

 public void setFieldTestId(String fieldTestId) {
  System.out.println("fieldTestID was set to: "+fieldTestId);
  this.fieldTestId = fieldTestId;
 }

 public String getFieldTestId() {
  return fieldTestId;
 }

}

Now comes the problem

As soon as I try to redirect the page in the preRenderView method of the bean (just uncomment the code in the method), using handleNavigation() the bean is created again in the next view instead of using the already created instance. Although the cid parameter is propagated to the next view !

Has anybody an idea what's wrong ?

best regards
Thomas

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