public void bellmanFord(
HashMap<String, HashMap<String, Integer>> adjMatrix,
Host src,
HashMap<String, String> predecessors,
HashMap<String, Integer> fwdingToSrcPorts,
HashMap<String, Integer> distances) {
if (src.getSwitch() == null) return;
for (Host host : this.getHosts()) {
distances.put(host.getName(), this.INFINITY);
if (host.getSwitch() != null) {
// predecessors.put(host.getName(), host.getSwitch().getStringId());
// fwdingToSrcPorts.put(host.getName(), host.getPort());
}
}
for (IOFSwitch sw : this.getSwitches().values()) {
String swIdName = String.valueOf(sw.getId());
distances.put(swIdName, this.INFINITY);
}
distances.put(src.getName(), 0);
predecessors.put(src.getName(), String.valueOf(src.getSwitch().getId()));
// fwdingToSrcPorts.put(src.getName(), src.getPort());
Set<String> allDeviceNames = this.adjMatrix.keySet();
if (debug_level < 1) {
System.out.println("BF : adjMetrix keyset size : " + allDeviceNames.size());
System.out.println("Num Links : " + this.getLinks().size());
}
for (int i = 0; i < allDeviceNames.size(); i++) {
// for each u, v
for (String device : allDeviceNames) {
for (Map.Entry<String, Integer> adjEntry : adjMatrix.get(device).entrySet()) {
// for each v adjacent to u
if (adjEntry.getValue() == 1) // 1 only if it is an edge
{
if ((distances.get(device) + 1) < distances.get(adjEntry.getKey())) {
distances.put(adjEntry.getKey(), (distances.get(device) + 1));
predecessors.put(adjEntry.getKey(), device);
// fwding ports need to be populated only if it is a switch
// case 1 : this switch's predecessor is the src
if (device.equals(src.getName())) {
fwdingToSrcPorts.put(adjEntry.getKey(), src.getPort());
}
// case 2 : this switch's predecessor is another switch
else {
for (Link link : this.getLinks()) {
if (String.valueOf(link.getDst()).equals(device)) {
if (String.valueOf(link.getSrc()).equals(adjEntry.getKey())) {
fwdingToSrcPorts.put(adjEntry.getKey(), link.getSrcPort());
}
}
}
}
}
}
}
}
}
if (debug_level < 2) displayBellmanFord(src, predecessors, fwdingToSrcPorts, distances);
}
public void bellmanFordOld(
HashMap<String, HashMap<String, Integer>> adjMatrix,
Host src,
HashMap<String, String> predecessors,
HashMap<String, Integer> fwdingToSrcPorts,
HashMap<String, Integer> distances) {
if (src.getSwitch() == null) return;
for (Host host : this.getHosts()) {
distances.put(host.getName(), this.INFINITY);
if (host.getSwitch() != null) {
predecessors.put(host.getName(), String.valueOf(host.getSwitch().getId()));
fwdingToSrcPorts.put(host.getName(), host.getPort());
}
}
for (long swId : this.getSwitches().keySet()) {
String swIdName = String.valueOf(swId);
distances.put(swIdName, this.INFINITY);
}
distances.put(src.getName(), 0);
predecessors.put(src.getName(), String.valueOf(src.getSwitch().getId()));
fwdingToSrcPorts.put(src.getName(), src.getPort());
Set<String> allDeviceNames = this.adjMatrix.keySet();
for (int i = 0; i < allDeviceNames.size() - 1; i++) {
// for each u
// for (Link link : this.getLinks())
// {
// System.out.println("Link Src: " + link.getSrc() + "\t" + link.getDst());
// if(distances.get(String.valueOf(link.getSrc())) + 1 <
// distances.get(String.valueOf(link.getDst())))
// {
// distances.put(String.valueOf(link.getDst()), distances.get(String.valueOf(link.getSrc())) +
// 1);
// predecessors.put(String.valueOf(link.getDst()), String.valueOf(link.getSrc()));
// fwdingToSrcPorts.put(String.valueOf(link.getDst()), link.getDstPort());
// }
// }
}
if (debug_level < 2) displayBellmanFord(src, predecessors, fwdingToSrcPorts, distances);
}
/**
* Event handler called when a host moves within the network.
*
* @param device information about the host
*/
@Override
public void deviceMoved(IDevice device) {
Host host = this.knownHosts.get(device);
if (null == host) {
host = new Host(device, this.floodlightProv);
this.knownHosts.put(device, host);
}
if (!host.isAttachedToSwitch()) {
this.deviceRemoved(device);
return;
}
log.info(
String.format(
"Host %s moved to s%d:%d", host.getName(), host.getSwitch().getId(), host.getPort()));
/** ****************************************************************** */
/* TODO: Update routing: change rules to route to host */
updateAllRouting();
/** ****************************************************************** */
}