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java geoTools api: refresh of my gui when a Feature source is update

Julia Bluemarine
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I have built a java gui that show some icons representing some Features taken from my Postgres database (with postGis integration) in the following way:

SimpleFeatureSource fs = dataStore.getFeatureSource("location"); //where location is my db table

Style style = createStyle(fs);

CachingFeatureSource cfs = new CachingFeatureSource(fs);

mapCtx.addLayer(cfs, style); //where mapCtx is my DefaultMapContext

Example of my feature: a man walking, so his position on the gui have to change (the data in the database are update by an external software).

Now, can I simulate the moving of my icon (man) on my java gui?

I was thinking to a listener that alert me when something in my db table has changed, then maybe a repaint of my map, but I can't find example and the right API.
Please, can someone help me?

Best regards
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