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Infinite loop when creating a custom task [message #1259321]

Fri, 28 February 2014 08:54

Cédric Casenove

Messages: 22
Registered: December 2013

Junior Member

Hi Bob,

hope your work on extending the model is progressing well.

I try to implement a "Message Start Event" with the custom task mechanism. My feature container looks like this:

public class MessageStartEventFeatureContainer extends CustomShapeFeatureContainer
{
    @Override
    protected IFeatureContainer createFeatureContainer(IFeatureProvider fp)
    {
        // create the feature container delegate
        return new StartEventFeatureContainer()
        {
            @Override
            public ICreateFeature getCreateFeature(IFeatureProvider fp)
            {
                return new CreateMessageStartEventFeature(fp);
            }

            @Override
            public IAddFeature getAddFeature(IFeatureProvider fp)
            {
                return new AddMessageStartEventFeature(fp);
            }
        };
    }
}

The AddMessageStartEventFeature class extends the AddEventFeature<StartEvent> class. When I create a new Message Start Event from the tool palette based on this feature container, I enter an infinite loop because at the end of the AddEventFeature.add() method, the following line keeps on calling my AddMessageStartEventFeature.add() method:

this.getFeatureProvider().getAddFeature(context).add(context);

I made a hack in my add() method to stop the loop, but I am not very proud of it Rolling Eyes

@Override
public PictogramElement add(IAddContext context)
{
    // Put a property in the context the first time the object is added to avoid infinite loop
    if (context.getProperty("MESSAGE_START_EVENT_ADD") == null)
    {
        context.putProperty("MESSAGE_START_EVENT_ADD", true);
        return super.add(context);
    }
       
    return null;
}

Is there a better way to reuse the AddEventFeature class in my feature container ?

Thanks

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