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# The graph of research 118 (docs/design/018 stage 2): edges keyed by
# from * 1048576 + to, loaded in bulk as rows; a breadth first search in
# one event, its queue and what it has seen the event's own lists.
record Edge {
link = 0
to = 0
}
record Seen {
node = 0
depth = 0
}
record Step {
node = 0
}
state edges: list of Edge by link
state nodes = 0
state hops = -1
state reached = 0
input size = message {
nodes: u32
}
input load = message {
rows: list of Edge
}
input route = message {
from: u32
to: u32
}
on size {
nodes = size.nodes
}
on load {
for r in load.rows {
edges.add(Edge { ..r })
}
}
on route {
let seen: list of Seen by node
let queue: list of Step
queue.append(Step { node: route.from })
seen.add(Seen { node: route.from })
for i in 0 .. nodes {
if i >= queue.count { break }
let q = queue.first + i
for e in edges[q.node * 1048576 .. q.node * 1048576 + 1048576] {
if !seen.has(e.to) {
seen.add(Seen { node: e.to, depth: seen[q.node].depth + 1 })
queue.append(Step { node: e.to })
}
}
}
hops = if seen.has(route.to) { seen[route.to].depth } else { -1 }
reached = seen.count
}
view far = hops
view found = reached
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