/**
* Given a filename, parses the seeds of the various independent streams from the file. An example
* seedfile looks like:
*
* <p>
*
* <pre>
* PLACES 6167 34322 540141 #to place nodes on the plane
* CONNECT 4149 3274 811023 #to connect nodes
* EDGE_CONN 4321 6394 564736 #used in the edge connection method in TopDownHier model
* GROUPING 39856 9062 30034 #used when grouping routers into an AS, in BottomUpHier model
* ASSIGNMENT 2603 24124 6350 #used in BottomUpHierModel to decide how many routers each AS gets.
* BANDWIDTH 1073 33601 47040 #used to specify bandwidth to edges in a topology
* </pre>
*
* <p>The divisions of three are to maintain compatability with the C++ version's erand48() call.
*/
public void parse(String filename) {
BufferedReader br = null;
try {
br = new BufferedReader(new FileReader(new File(filename)));
} catch (IOException e) {
Util.ERR("Error reading seedfile. " + e);
}
String line = "";
try {
while ((line = br.readLine()) != null) {
StringTokenizer st = new StringTokenizer(line);
String seedName = st.nextToken();
String first = st.nextToken();
String second = st.nextToken();
String third = st.nextToken();
String seedString = first.trim() + second.trim() + third.trim();
long seedValue = Long.parseLong(seedString);
if (seedName.equals("PLACES")) setPlaceNodesSeed(seedValue);
else if (seedName.equals("CONNECT")) setConnectNodesSeed(seedValue);
else if (seedName.equals("BANDWIDTH")) setBWSeed(seedValue);
else if (seedName.equals("EDGE_CONN")) setEdgeConnSeed(seedValue);
else if (seedName.equals("GROUPING")) setGroupingSeed(seedValue);
else if (seedName.equals("ASSIGNMENT")) setAssignSeed(seedValue);
}
} catch (Exception e2) {
Util.ERR("Error reading seedfile. " + e2);
}
}
/**
* Export the seeds used to lastSeedFile. (generally called "last_seed_file") Export the current
* state of the PRNG and to nextSeedFile so the next experiement can continue to use the
* independent streams (generally this file is called "seed_file")
*/
public void export(String lastSeedFile, String nextSeedFile) {
Util.MSG("exporting seedfiles..");
BufferedWriter bw = null;
try {
bw = new BufferedWriter(new FileWriter(new File(lastSeedFile)));
bw.write("PLACES " + longTo3String(placeSeed) + "\t# used when placing nodes on the plane");
bw.newLine();
bw.write("CONNECT " + longTo3String(connectSeed) + "\t# used when interconnecting nodes");
bw.newLine();
bw.write(
"EDGE_CONN "
+ longTo3String(ECSeed)
+ "\t# used in the edge connection method of top down hier");
bw.newLine();
bw.write(
"GROUPING "
+ longTo3String(GroupSeed)
+ "\t# used when deciding which routers to group into an AS in bottom up hier");
bw.newLine();
bw.write(
"ASSIGNMENT "
+ longTo3String(AssignSeed)
+ "\t# used when deciding how many routers to group into an AS in bottom up hier");
bw.newLine();
bw.write("BANDWIDTH " + longTo3String(BWSeed) + "\t# used when assigning bandwidths");
bw.newLine();
bw.close();
} catch (IOException e) {
System.out.println("[BRITE ERROR]: Error writing seeds to seedfile. " + e);
}
try {
bw = new BufferedWriter(new FileWriter(new File(nextSeedFile)));
bw.write(
"PLACES "
+ longTo3String(PlaceRandom.nextLong())
+ "\t# used when placing nodes on the plane");
bw.newLine();
bw.write(
"CONNECT "
+ longTo3String(ConnectRandom.nextLong())
+ "\t# used when interconnecting nodes");
bw.newLine();
bw.write(
"EDGE_CONN "
+ longTo3String(EdgeConnRandom.nextLong())
+ "\t# used in the edge connection method of top down hier");
bw.newLine();
bw.write(
"GROUPING "
+ longTo3String(GroupingRandom.nextLong())
+ "\t# used when deciding which routers to group into an AS in bottom up hier");
bw.newLine();
bw.write(
"ASSIGNMENT "
+ longTo3String(AssignRandom.nextLong())
+ "\t# used when deciding how many routers to group into an AS in bottom up hier");
bw.newLine();
bw.write(
"BANDWIDTH " + longTo3String(BWRandom.nextLong()) + "\t# used when assigning bandwidths");
bw.newLine();
bw.close();
} catch (IOException e) {
System.out.println("[BRITE ERROR]: Error writing seeds to seedfile. " + e);
}
}