Philip Graff created TINKERPOP-1862:
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             Summary: TinkerGraph VertexProgram message passing doesn't work 
properly when using Direction.BOTH
                 Key: TINKERPOP-1862
                 URL: https://issues.apache.org/jira/browse/TINKERPOP-1862
             Project: TinkerPop
          Issue Type: Bug
            Reporter: Philip Graff


I think the messages are being sent properly in TinkerMessenger, but when I 
call messenger.receiveMessages(), the vertex is getting messages from the 
outVertex of their edges regardless of the edge direction. This is due to line 
71 of TinkerMessenger (linked below) which calls 
Edge.vertices(direction).next(), thus getting the first result out of the 
Vertex iterator. For IN or OUT, this isn't a problem. But for BOTH, following 
line 124 of TinkerEdge (linked below), the outVertex is always returned first. 
TinkerMessenger needs to be modified to return the correct vertex (I think it's 
the one that != this.vertex).

https://github.com/apache/tinkerpop/blob/master/tinkergraph-gremlin/src/main/java/org/apache/tinkerpop/gremlin/tinkergraph/process/computer/TinkerMessenger.java#L71

https://github.com/apache/tinkerpop/blob/master/tinkergraph-gremlin/src/main/java/org/apache/tinkerpop/gremlin/tinkergraph/structure/TinkerEdge.java#L124



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