Pass conversation id as parameter when p:poll stops
I am using Primefaces and p:poll because I want to navigate to another page when the poll stops after a condition comes true. On both of the pages the same conversation bean is used. (In fact there are three pages with that use this bean).
But I do not know how to pass as parameter the conversation Id when the poll stops, the way that would be passed if there was a link or button, since f:param cannot be used with p:poll.
Any help would be appreciated.
Thanks in advance.
I think you got two problems:
- How to make a multi-page wizard?
- How to check if a task (search) is finished?
How to make a multi-page wizard?
I think that is not your main problem and you already got a solution. This is just for the sake of completness.
You can either use a flow or a conversation (I would use this).
How to check if a task (search) is finished?
For this you also got a solution that is similar to this.
But as @Jasper_de_Vries said in the comments a websocket has a way better performance than a p:poll.
So here’s my solution for the second problem:
Demo XHTML file:
<h:form> <!-- must be in form when it has nested f:ajax's --> <f:websocket channel="demo" scope="view"> <!-- renders the form and the 'someId' component --> <!-- when receives 'complete' message --> <f:ajax event="complete" render="@form :someId" /> </f:websocket> <!-- display result here --> </h:form> <xy:whatever id="someId"> <!-- display result here --> </xy:whatever> And your bean:
@Named @ConversationScoped public class Demo { @Inject private SomeService service; @Inject @Push private PushContext demo; // variable name must match the channel name private Result result; // getter + setter // conversation utilities, etc. private void sendMessage() { demo.send("complete"); // this is the whole magic } public void startLongTask() { service.startLongTask(/* parameters */, result -> { // this runs when the callback is accepted this.result = result; sendMessage(); }); } } SomeService:
@Stateless/@Stateful public class SomeServiceService { @Asynchronous public void startLongTask(/* parameters*/, Consumer<Result> callback) { // very long task ... callback.accept(result); } } Basically when the user clicks the button a long task (e.g. a search) is started. When the service completes it will invoke the callback and the UI is updated.
