[GraphHopper] How to consider traffic jam when route on road network?

[lanmaster at hotmail.ru]

Graphhopper is a project for finding routes over a road network. It also provides functionality for weighting this routing like fastest or shortest path e.g. via the FastestWeighting class. Now, the question is: how can we extend Graphhopper to use the speed data we get from our traffic provider in realtime?

As I can see:

We must create a function that gets traffic jam data from our database.
We must force use that modified function (Encoder?) somewhere in Graphhopper route() function.
Do I think right?

Please show me how we can do this by example.
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