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  • between HARegionQueue and DACE (DispatchedAndCurrentEvents) objects (through the mis-named HARegionQueue.eventsMap)
  • between HARegion and the two kinds of entries it holds: <Position,Conflatable>, and  and <ThreadIdentifier,SequenceID>

In both cases, the Java Maps are depicted as associations in the diagram (the Map objects are not shown explicitly). So, for instance HARegionQueue.eventsMap is a Map. It's depicted as a 1-to-(0..1 per Position) association from HARegionQueue to Position. Similarly for HARegion to Conflatable and HARegion to SequenceID.

The diagram introduces two types not actually present in the Java code. Both are depicted as subtypes of Long: SequenceID to stand for an event's sequence id; and Position to stand for a position in a queue. In the source code these are both just Longs.

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