/** Method to assign the burst states. */
private void analyzeBursts() {
List<UserEvent> userEvents = analysis.getUserEvents();
List<CpuActivity> cpuEvents = analysis.getCpuActivityList();
int userEventsSize = userEvents.size();
int cpuEventsSize = cpuEvents.size();
int userEventPointer = 0;
int cpuPointer = 0;
// Analyze each burst
Burst b = null;
Burst lastBurst;
for (Iterator<Burst> i = burstCollection.iterator(); i.hasNext(); ) {
lastBurst = b;
b = i.next();
// Step 1: Remove background packets
List<PacketInfo> pktIdx = new ArrayList<PacketInfo>(b.getPackets().size());
int payloadLen = 0;
Set<TcpInfo> tcpInfo = new HashSet<TcpInfo>();
for (PacketInfo p : b.getPackets()) {
if (p.getAppName() != null) {
payloadLen += p.getPayloadLen();
pktIdx.add(p);
TcpInfo tcp = p.getTcpInfo();
if (tcp != null) {
tcpInfo.add(tcp);
}
}
}
if (pktIdx.size() == 0) {
assert (payloadLen == 0);
b.addBurstInfo(BurstInfo.BURST_BKG);
continue;
}
PacketInfo pkt0 = pktIdx.get(0);
TcpInfo info0 = pkt0.getTcpInfo();
double time0 = pkt0.getTimeStamp();
// Step 2: a long burst?
if (b.getEndTime() - b.getBeginTime() > profile.getLargeBurstDuration()
&& payloadLen > profile.getLargeBurstSize()) {
b.addBurstInfo(BurstInfo.BURST_LONG);
++longBurstCount;
continue;
}
// Step 3: Contains no payload?
if (payloadLen == 0) {
if (tcpInfo.contains(TcpInfo.TCP_CLOSE)) {
b.addBurstInfo(BurstInfo.BURST_FIN);
}
if (tcpInfo.contains(TcpInfo.TCP_ESTABLISH)) {
b.addBurstInfo(BurstInfo.BURST_SYN);
}
if (tcpInfo.contains(TcpInfo.TCP_RESET)) {
b.addBurstInfo(BurstInfo.BURST_RST);
}
if (tcpInfo.contains(TcpInfo.TCP_KEEP_ALIVE)
|| tcpInfo.contains(TcpInfo.TCP_KEEP_ALIVE_ACK)) {
b.addBurstInfo(BurstInfo.BURST_KEEPALIVE);
}
if (tcpInfo.contains(TcpInfo.TCP_ZERO_WINDOW)) {
b.addBurstInfo(BurstInfo.BURST_ZEROWIN);
}
if (tcpInfo.contains(TcpInfo.TCP_WINDOW_UPDATE)) {
b.addBurstInfo(BurstInfo.BURST_WINUPDATE);
}
if (b.getBurstInfos().size() == 0
&& (info0 == TcpInfo.TCP_ACK_RECOVER || info0 == TcpInfo.TCP_ACK_DUP)) {
b.addBurstInfo(BurstInfo.BURST_LOSS_RECOVER);
}
if (b.getBurstInfos().size() > 0) continue;
}
// Step 4: Server delay
if (pkt0.getDir() == PacketInfo.Direction.DOWNLINK
&& (info0 == TcpInfo.TCP_DATA || info0 == TcpInfo.TCP_ACK)) {
b.addBurstInfo(BurstInfo.BURST_SERVER_DELAY);
continue;
}
// Step 5: Loss recover
if (info0 == TcpInfo.TCP_ACK_DUP || info0 == TcpInfo.TCP_DATA_DUP) {
b.addBurstInfo(BurstInfo.BURST_LOSS_DUP);
continue;
}
if (info0 == TcpInfo.TCP_DATA_RECOVER || info0 == TcpInfo.TCP_ACK_RECOVER) {
b.addBurstInfo(BurstInfo.BURST_LOSS_RECOVER);
continue;
}
// Step 6: User triggered
final double USER_EVENT_SMALL_TOLERATE = profile.getUserInputTh();
if (payloadLen > 0) {
UserEvent ue = null;
while ((userEventPointer < userEventsSize)
&& ((ue = userEvents.get(userEventPointer)).getReleaseTime()
< (time0 - USER_EVENT_TOLERATE))) ++userEventPointer;
BurstInfo bi =
ue != null
? ((ue.getEventType() == UserEventType.SCREEN_LANDSCAPE
|| ue.getEventType() == UserEventType.SCREEN_PORTRAIT)
? BurstInfo.BURST_SCREEN_ROTATION_INPUT
: BurstInfo.BURST_USER_INPUT)
: null;
int j = userEventPointer;
double minGap = Double.MAX_VALUE;
while (j < userEventsSize) {
UserEvent uEvent = userEvents.get(j);
if (withinTolerate(uEvent.getPressTime(), time0)) {
double gap = time0 - uEvent.getPressTime();
if (gap < minGap) {
minGap = gap;
}
}
if (withinTolerate(uEvent.getReleaseTime(), time0)) {
double gap = time0 - uEvent.getReleaseTime();
if (gap < minGap) {
minGap = gap;
}
}
if (uEvent.getPressTime() > time0) {
break;
}
j++;
}
if (minGap < USER_EVENT_SMALL_TOLERATE) {
b.addBurstInfo(bi);
continue;
} else if (minGap < USER_EVENT_TOLERATE
&& (lastBurst == null || lastBurst.getEndTime() < b.getBeginTime() - minGap)) {
double cpuBegin = time0 - minGap;
double cpuEnd = time0;
// Check CPU usage
while (cpuPointer < cpuEventsSize) {
double t = cpuEvents.get(cpuPointer).getBeginTimeStamp();
if (t < b.getBeginTime() - USER_EVENT_TOLERATE) {
++cpuPointer;
} else {
break;
}
}
int k = cpuPointer;
double s = 0.0f;
int ns = 0;
while (k < cpuEventsSize) {
CpuActivity cpuAct = cpuEvents.get(k);
double t = cpuAct.getBeginTimeStamp();
if (t > cpuBegin && t < cpuEnd) {
s += cpuAct.getUsage();
ns++;
}
if (t >= cpuEnd) {
break;
}
k++;
}
if (ns > 0 && (s / ns) > AVG_CPU_USAGE_THRESHOLD) {
b.addBurstInfo(bi);
b.addBurstInfo(BurstInfo.BURST_CPU_BUSY);
continue;
}
}
}
// Step 7: Client delay
if (b.getBurstInfos().size() == 0 && payloadLen == 0) {
b.addBurstInfo(BurstInfo.BURST_UNKNOWN);
} else {
b.addBurstInfo(BurstInfo.BURST_CLIENT_DELAY);
}
}
}
/** Groups packets into Burst Collections */
private void groupIntoBursts() {
// Validate that there are packets
List<PacketInfo> packets = this.analysis.getPackets();
if (packets.size() <= 0) {
this.burstCollection = Collections.emptyList();
return;
}
ArrayList<Burst> result = new ArrayList<Burst>();
double burstThresh = profile.getBurstTh();
double longBurstThresh = profile.getLongBurstTh();
List<PacketInfo> burstPackets = new ArrayList<PacketInfo>();
// Step 1: Build bursts using burst time threshold
PacketInfo lastPacket = null;
for (PacketInfo packet : packets) {
if (lastPacket == null
|| (packet.getTimeStamp() - lastPacket.getTimeStamp() > burstThresh
&& !mss.contains(lastPacket.getPayloadLen()))) {
if (burstPackets.size() > 0) {
result.add(new Burst(burstPackets));
burstPackets.clear();
}
}
burstPackets.add(packet);
lastPacket = packet;
}
result.add(new Burst(burstPackets));
// Step 2: Remove promotion delays and merge bursts if possible
Map<PacketInfo, Double> timestampList = normalizeCore(packets);
List<Burst> newBurstColl = new ArrayList<Burst>(result.size());
int n = result.size();
Burst newBurst = result.get(0);
for (int i = 0; i < n - 1; i++) {
Burst bnext = result.get(i + 1);
double time1 = timestampList.get(newBurst.getEndPacket());
double time2 = timestampList.get(bnext.getBeginPacket());
if ((time2 - time1) < burstThresh) {
newBurst.merge(bnext);
} else {
newBurstColl.add(newBurst);
newBurst = bnext;
}
}
newBurstColl.add(newBurst);
this.burstCollection = newBurstColl;
// Step 3: compute burstID for each packet
n = burstCollection.size();
for (Burst b : burstCollection) {
for (PacketInfo p : b.getPackets()) {
p.setBurst(b);
}
}
// Step 4: determine short/long IBTs
n = burstCollection.size();
for (int i = 0; i < n; i++) {
Burst b = burstCollection.get(i);
assert (b.getEndTime() >= b.getBeginTime());
if (i < n - 1) {
double ibt = burstCollection.get(i + 1).getBeginTime() - b.getEndTime();
assert (ibt >= burstThresh);
b.setbLong((ibt > longBurstThresh));
} else {
b.setbLong(true);
}
}
}
