/**
* Initializes the node <tt>n</tt> associating it with the BitTorrent protocol and setting the
* reference to the tracker, the status of the file and the bandwidth.
*
* @param n The node to initialize
*/
public void initialize(Node n) {
Node tracker = Network.get(0);
BitTorrent p;
p = (BitTorrent) n.getProtocol(pid);
p.setTracker(tracker);
p.setThisNodeID(n.getID());
setFileStatus(p);
setBandwidth(p);
}
/**
* Sets the completed pieces for the given protocol <tt>p</tt>.
*
* @parm percentage The percentage of the downloaded pieces, according to {@link
* #getProbability()}
* @param p the BitTorrent protocol
*/
private void choosePieces(int percentage, BitTorrent p) {
double temp =
((double) p.nPieces / 100.0) * percentage; // We use a double to avoid the loss of precision
// during the division operation
int completed = (int) temp; // integer number of piece to set as completed
// 0 if the peer is a newer
p.setCompleted(completed);
if (percentage == 100) p.setPeerStatus(1);
int tmp;
while (completed != 0) {
tmp = CommonState.r.nextInt(p.nPieces);
if (p.getStatus(tmp) != 16) {
p.setStatus(tmp, 16);
completed--;
}
}
}
/**
* Set the maximum bandwidth for the node, choosing uniformly at random among 4 values.
*
* <p>The allowed bandwidth speed are 640 Kbps, 1 Mbps, 2 Mbps and 4 Mbps.
*
* @param p The BitTorrent protocol
*/
private void setBandwidth(BitTorrent p) {
// int value = CommonState.r.nextInt(4);
// switch(value){
// case 0: p.setBandwidth(640);break; //640Kbps
// case 1: p.setBandwidth(1024);break;// 1Mbps
// case 2: p.setBandwidth(2048);break;// 2Mbps
// case 3: p.setBandwidth(4096);break; //4Mbps
// }
p.setBandwidth(1024);
}
/**
* Sets the status of the shared file according to the probability value given by {@link
* #getProbability()}.
*
* @param p The BitTorrent protocol
*/
private void setFileStatus(BitTorrent p) {
int percentage = p.getThisNodeID() == 1 ? 100 : 0;
choosePieces(percentage, p);
}