@Override
public Set<Path> getPaths(ElementId src, ElementId dst, LinkWeight weight) {
checkPermission(TOPOLOGY_READ);
checkNotNull(src, ELEMENT_ID_NULL);
checkNotNull(dst, ELEMENT_ID_NULL);
// Get the source and destination edge locations
EdgeLink srcEdge = getEdgeLink(src, true);
EdgeLink dstEdge = getEdgeLink(dst, false);
// If either edge is null, bail with no paths.
if (srcEdge == null || dstEdge == null) {
return ImmutableSet.of();
}
DeviceId srcDevice = srcEdge != NOT_HOST ? srcEdge.dst().deviceId() : (DeviceId) src;
DeviceId dstDevice = dstEdge != NOT_HOST ? dstEdge.src().deviceId() : (DeviceId) dst;
// If the source and destination are on the same edge device, there
// is just one path, so build it and return it.
if (srcDevice.equals(dstDevice)) {
return edgeToEdgePaths(srcEdge, dstEdge);
}
// Otherwise get all paths between the source and destination edge
// devices.
Topology topology = topologyService.currentTopology();
Set<Path> paths =
weight == null
? topologyService.getPaths(topology, srcDevice, dstDevice)
: topologyService.getPaths(topology, srcDevice, dstDevice, weight);
return edgeToEdgePaths(srcEdge, dstEdge, paths);
}
