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Remove service registration from EventBroker when the service's context is getting disposed [message #1081641]

Wed, 07 August 2013 13:49

Peter Ambrus

Messages: 3
Registered: August 2013

Junior Member

I have a service which contains some event handling method declared with the @UIEventTopic annotation. This service is instantiated through a context function when a part is instantiated (the user opens the part). So the service will be in the part's context.
After the instantiation the user uses the part, the service handles the events correctly, everything is fine.
When the user gets bored of the part he closes it. In this moment the part will be disposed and the context of the part will be disposed as well, so I expect that my service won't handle the events any more as it's context is already disposed. Unfortunately I experienced that the service won't be removed from the EventBroker when the context is disposed, so its handling method will be called when the appropriate event is fired. Actually as much as I could debug the only thing is happening with the service is the processing of its @PreDestroy method.

My question is whether it is a normal behavior or the service should be removed from the EventBroker when the context is disposed? In case this is the normal behavior how can I deregister my service from the EventBroker?

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Re: Remove service registration from EventBroker when the service's context is getting disposed [message #1081660 is a reply to message #1081641]

Wed, 07 August 2013 14:10

Thomas Schindl

Messages: 6651
Registered: July 2009

Senior Member

How do you construct the service instance in the context function? The
deregistration is done when the context used to create the instance is
disposed (e.g. the one from a part is disposed when it is closed).

Tom

On 07.08.13 15:54, Peter Ambrus wrote:
> I have a service which contains some event handling method declared with
> the @UIEventTopic annotation. This service is instantiated through a
> context function when a part is instantiated (the user opens the part).
> So the service will be in the part's context.
> After the instantiation the user uses the part, the service handles the
> events correctly, everything is fine.
> When the user gets bored of the part he closes it. In this moment the
> part will be disposed and the context of the part will be disposed as
> well, so I expect that my service won't handle the events any more as
> it's context is already disposed. Unfortunately I experienced that the
> service won't be removed from the EventBroker when the context is
> disposed, so its handling method will be called when the appropriate
> event is fired. Actually as much as I could debug the only thing is
> happening with the service is the processing of its @PreDestroy method.
>
> My question is whether it is a normal behavior or the service should be
> removed from the EventBroker when the context is disposed? In case this
> is the normal behavior how can I deregister my service from the
> EventBroker?

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Re: Remove service registration from EventBroker when the service's context is getting disposed [message #1081663 is a reply to message #1081660]

Wed, 07 August 2013 14:19

Peter Ambrus

Messages: 3
Registered: August 2013

Junior Member

Hi Tom,

The context function doesn't contain any special:

public class PositionPresenterFactory extends ContextFunction {

    @Override
    public Object compute(IEclipseContext context, String contextKey) {
        return ContextInjectionFactory.make(PositionPresenterImpl.class, context);
    }
}

It is called when the @PostConstract method of the part is called as it gets a PositionPresenter object. So I assume the context in the context function is the same as in the part.

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