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The topology model on the server side represents links as unidirectional, with a source and destination. In the UI, each link model object abstracts away the directionality. This is to provide a single "link" element between two "nodes" in the visualization. However, this makes the link event processing a little more complex. Internally the links are modeled something like this:
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When a link event arrives, a lookup is done to see if the "parent" object for that link already exists.
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