[jboss-user] [JBoss Seam] - Re: Can I end a conversation programmatically?

[raffaele.camanzo]

Hi Gavin,

creating a specific test case it's been useful to better understand the Seam behaviour when I try to create a conversation with a given id or remove a conversation and switch to a different one. Ok, this is what I've seen:

1 - Conversation creation with a given ID: If I create a conversation with a given id (@Begin(join=true, id="myId1")), Seam creates a conversation with the given identifier, but if I have two (but I think also more than two) defined as follows:


  | 
  | ActionOne.java:
  | 
  | @Name("actionOne")
  | @Scope(ScopeType.CONVERSATION)
  | public class ActionOne {
  | 
  |     @Begin(join=true, id="actionone")
  |     public String startConversation() {
  |         .....
  |         return "one";
  |     }
  | }
  | 
  | 
  | 
  | ActionTwo.java:
  | 
  | @Name("actionTwo")
  | @Scope(ScopeType.CONVERSATION)
  | public class ActionTwo {
  | 
  |     @Begin(join=true, id="actiontwo")
  |     public String startConversation() {
  |         .....
  |         return "two";
  |     }
  | }
  | 
  | 

When I start the first conversation, say actionone, everything is ok, the conversation has the given identifier; but when I start the second one the conversation identifier is the same for both: the first one 'actionone', even if the two actions maintain different view ids.

If I pass the conversation identifier as a <f:param> and the param name is other than "conversationId" the conversation identifier is ignored. 
If I pass a parameter named as conversationId in a <s:link> to start a conversation with a static identifier defined in the @Begin annotation the identifier is completely ignored and the conversation gets the value of the conversationId parameter.

As a recap:
I can create, correctly, only named conversations following these guidelines:

 - The link to the conversation begin method must contain a parameter named conversationId, for example:


  | <s:link action="#{actionTwo.startConversation}">
  | 	<h:outputText value="Start Conversation" />
  |         <f:param name="conversationId" value="<something static or EL>" />
  | </s:link>
  | 

 - The conversation begin method must be defined as follows:


  | @Name("actionOne")
  | @Scope(ScopeType.CONVERSATION)
  | public class ActionOne {
  | 
  |     @Begin(join=true, id="#{param.conversationId}")
  |     public String startConversation() {
  |         .....
  |         return "one";
  |     }
  | }
  | 

Maybe I discovered the hot water... But I did not find all these rules to follow in the documentation, but probably I did not read very well the documentation; so if there's someone else like me... maybe he can loose less time than me to get the right way.

2 - Remove a conversation and switch to a different one: Conversation.instance().end() works (but does not execute the @End method), removes the current conversation, but does not do enough, indeed, in my application I need to switch to a different conversation in order to show the tab content of the tab which reaches the focus after the tab remotion, then I need to do this (or something equivalent):


  |      Conversation.instance().end();
  |      Manager.instance().switchConversation(focusedTabConversationId);
  | 

but this unfortunately does not work (as I would) and, more precisely, happens:
 - if I call only the Conversation.instance().end() Seam does not switch to the conversation of the tab which reaches the focus and then does not show the correct data, moreover, in my situation the outcome of the tab removed and of the tab focused can be the same (and in my tests were the same) with the effect that the screen is frozen with the data I just removed;
 - if I call both the methods Seam performs the conversation switch correctly and shows the correct tab but does not perform any conversation remotion 

an example of my scenario: I have a search tab, a user can search for something, when finds what he needs selecting the related link opens a new tab with the detail and then closes the search tab, if he needs to open again the search tab is to search something else but everything he made before is already on the screen.

So, this is what I found... But I need a little of help to understand if I made something wrong, if it's a known behaviour a bug.....

Regards,
Raffaele Camanzo


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