seam events

[skanky78]

hi,

i'm having problems with seam events definied in components.xml. if a certain events occurs a method with a string as an argument shall be called.

example:

<components>
 <event type="say">
 <action execute="#{exampleListener.saySomething}"/>
 </event>
</components>

@Name("example")
public class Example {
 public void saySomething() {
 FacesMessages.instance().add("Hello World");
 Events.instance().raiseEvent("say", "Hello World");
 }
}

@Name("exampleListener")
public class ExampleListener {
 public void saySomething(String text) {
 FacesMessages.instance().add(text);
 }
}

this example does'nt work because seam tries to find a method named 'saySomething' without any argument. but how can i define that a method with an argument (e.g. string) shall be executed? is this possible via components.xml?

cheers,
sven

[pmuir]

No, you should use the Seam contexts to pass variables.

[skanky78]

quote from the seam manual:

...Notice that this event producer has no dependency upon event consumers. The event listener may now be implemented with absolutely no dependency upon the producer..

so you mean i have to introduce a dependency upon the producer, right?

can you give a short solution for my simplified example? how can i get the event state (argument "Hello World") of the fired event in event listener? at the moment i'm not seeing the wood for the trees...

thanks,
sven

[pmuir]

Ok, so the simple answer is no, its not possible from components.xml

[skanky78]

thank you for your reply pete, but my second question targeted on how to do it the way you mentioned:

No, you should use the Seam contexts to pass variables.

you mean i should use @OUT for the producer and @IN for the consumer. is that the right way?

cheers,
sven

[pmuir]

Exactly.