On Tue, 16 Apr 2002 21:46, Peter Donald wrote:
> Hi,
>
> This extracted from other thread
>
> > We also need to decide how listeners are going to work. We should
> > probably move them out of workspace, and generalise into some kind of
> > event infrastructure.
>
> I have been working on this a few days ago bu haven't really committed
> anytjhing atm. Basically I added a "o.a.myrmidon.api.event" package that
> contains basically the following
>
> TaskEvent
> {
> String path;
> String name; //aka shortname
> String location; //give location in physical medium contianed in
> String message;
> Throwable throwable;
> int processID;
> }
>
> interface TaskListener
> {
> void taskEvent(TaskEvent te);
> }
>
> Ignore processID for the moment as it is tied into something else I am
> working on to allow us to have "Java Processes" that are mostly isolated
> from each other (as long as you don't load native libraries).
>
> The "path" element in even gives the path to this event. The "name" is the
> enclosing "element" in which the event was generated (usually a task). For
> instance the event
>
> { "/ant/compile", "javac", "build.xml:20:13", "Compile success", null, 0 }
>
> Saids that a message "Compile success" was generated by the javac task in
> the compile target which is in the ant project. The physical location
> translating to "build.xml:20:13"
>
> The AbstractProjectListener would then just be a layer on top of
> TaskListener that translates the TaskEvents into the easier to digest
> ProjectListener interface. It would also mean that all of the project
> listener stuff could be put into framework layer rather than API layer
> (yay!!!).
>
> Thoughts?
In general, a good plan - but I have some questions:
* How does an event get fired? Who is allowed to fire events? Can tasks?
All services? A single service?
* How does a listener get registered? How does a task register a listener?
Or an app? Or a service?
* Are events scoped? That is, are they visible outside the execution frame
where they were fired in? In parent frames? Child frames? Globally?
Depends on the listener?
* How are events typed? Are the types extensible? Can we fire, say,
'external command started' or 'type registered' events for inter-service
communication?
--
Adam
--
To unsubscribe, e-mail: <mailto:[EMAIL PROTECTED]>
For additional commands, e-mail: <mailto:[EMAIL PROTECTED]>
