// -----------------------------------------------------------
// for "SrvRqst"
// find the matched URLs with (type, scope, predicate, ltag)
// return: error code (short)
// number of matched URLs (short)
// URL blocks (decided bt previous #URL)
// -----------------------------------------------------------
public synchronized byte[] getMatchedURL(String type, String scope, String pred, String ltag) {
byte[] buf = null;
int ecode = Const.OK;
if (!Util.shareString(daf.getScope(), scope, ",")) {
ecode = Const.SCOPE_NOT_SUPPORTED;
}
b.reset();
try {
int count = 0;
d.writeShort(ecode); // error code
d.writeShort(count); // URL count, place holder
if (ecode == Const.OK) { // no error, find matched URLs
Iterator values = table.values().iterator();
while (values.hasNext()) {
Entry e = (Entry) values.next();
if (e.match(type, scope, pred, ltag)) {
count++;
d.writeByte(0);
d.writeShort(e.getLifetime());
d.writeShort(e.getURL().length());
d.writeBytes(e.getURL());
d.writeByte(0);
}
}
}
buf = b.toByteArray();
if (count > 0) Util.writeInt(buf, 2, count, 2); // update count
} catch (Exception e) {
if (ServiceLocationManager.displayMSLPTrace) e.printStackTrace();
}
return buf;
}
// -------------------------------------------
// check lifetime and remove expired entries
// -------------------------------------------
public synchronized void rmExpiredEntry() {
long currtime = System.currentTimeMillis();
Iterator keys = table.keySet().iterator();
while (keys.hasNext()) {
String k = (String) keys.next();
Entry e = (Entry) table.get(k);
if (currtime > (e.getArrivalTS() + e.getLifetime() * 1000)) {
keys.remove();
}
}
}
// ------------------------------------------------------------------
// send newer updates to the peer through "tcp" peering connection
// compare each entry's updating ID with IDs in (adalist, atslist)
// ------------------------------------------------------------------
public synchronized void antiEntropy(slpTcpHandler tcp, String scope, String rda, long rts) {
TreeMap tmp = new TreeMap();
Iterator values = table.values().iterator();
while (values.hasNext()) {
Entry e = (Entry) values.next();
String ada = e.getAcceptDA();
long ats = e.getAcceptTS();
if (ada.equalsIgnoreCase(rda)
&& ats > rts
&& // for newer updates
Util.shareString(scope, e.getScope(), ",")) {
tmp.put(new Long(ats), e.getLtag().concat(e.getURL()));
}
}
long ctime = System.currentTimeMillis() / 1000;
values = tmp.values().iterator();
while (values.hasNext()) {
String k = (String) values.next();
Entry e = (Entry) table.get(k);
int ltime = (int) (e.getArrivalTS() / 1000 + e.getLifetime() - ctime);
byte[] buf =
composer.SrvReg(
0,
Const.fresh_flag,
e.getLtag(),
e.getURL(),
ltime,
e.getType(),
e.getScope(),
e.getAttr(""));
buf =
composer.MeshFwdExt(buf, Const.Fwded, e.getVersionTS(), e.getAcceptDA(), e.getAcceptTS());
tcp.send(buf, buf.length);
if (e.getDeleted()) {
buf = composer.SrvDeReg(0, e.getLtag(), e.getScope(), e.getURL(), ltime, "");
buf =
composer.MeshFwdExt(
buf, Const.Fwded, e.getVersionTS(), e.getAcceptDA(), e.getAcceptTS());
tcp.send(buf, buf.length);
}
}
}