This implementation can register a set of graph sinks (or separate sets of attributes or elements sinks) and provides protected methods to easily broadcast events to all the sinks (beginning with "send").
Each time you want to produce an event toward all registered sinks, you call one of the "send*" methods with correct parameters. The parameters of the "send*" methods maps to the usual GraphStream events.
This class is "reentrant". This means that if a send*() method is called during the execution of another or the same send*() method, the event is deferred until the first send*() method is finished. This avoid recursive loops if a sink modifies the input during event handling.
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