Add dot graph generation from a summing bird graph.

[ianoc]

Use with
import com.twitter.summingbird.viz.BaseViz

val writer = new PrintWriter(new File("/tmp/output.dot"))

BaseViz(node, writer)
writer.close()

[sritchie]

Nice! Can you paste in some example output for some graph?

[ianoc]

graph:

Storm.source(Spout.fromTraversable(Seq(1, 2, 3, 4))).name("Source from a sequence")
.flatMap {
i => List(i, i, i)
}.name("Increase stream size by outputting copies")
.map( _ -> 1L ).name("Convert to tuple")
.sumByKey(MergeableStoreSupplier.from {
MergeableStore.fromStore(Int, BatchID), Long
}).name("Group by, sum and store to JMap")

Dot graph produced:

graph summingbirdGraph {
"Increase stream size by outputting copies" -- "Convert to tuple"
"Convert to tuple" -- "Group by, sum and store to JMap"
"Source from a sequence" -- "Increase stream size by outputting copies"

}

[ianoc]

[johnynek]

not crazy about this. We already have the get method, can you just expose the keys?

def nodes: Set[Producer[P, _]] = graph.keys

[ianoc]

Updated to reflect @johnynek 's comments