public Resolution(ExtendedResolver eres, Message query) {
List l = eres.resolvers;
resolvers = (Resolver[]) l.toArray(new Resolver[l.size()]);
if (eres.loadBalance) {
int nresolvers = resolvers.length;
/*
* Note: this is not synchronized, since the
* worst thing that can happen is a random
* ordering, which is ok.
*/
int start = eres.lbStart++ % nresolvers;
if (eres.lbStart > nresolvers) eres.lbStart %= nresolvers;
if (start > 0) {
Resolver[] shuffle = new Resolver[nresolvers];
for (int i = 0; i < nresolvers; i++) {
int pos = (i + start) % nresolvers;
shuffle[i] = resolvers[pos];
}
resolvers = shuffle;
}
}
sent = new int[resolvers.length];
inprogress = new Object[resolvers.length];
retries = eres.retries;
this.query = query;
}
public static Record[] getRecords(String namestr, short type, short dclass, byte cred) {
Message query;
Message response;
Record question;
Record[] answers;
int answerCount = 0, i = 0;
Enumeration e;
Name name = new Name(namestr);
/*System.out.println("lookup of " + name + " " + Type.string(type));*/
if (!Type.isRR(type) && type != Type.ANY) return null;
if (res == null) {
try {
eres = new ExtendedResolver();
} catch (UnknownHostException uhe) {
System.out.println("Failed to initialize resolver");
System.exit(-1);
}
}
if (cache == null) cache = new Cache();
CacheResponse cached = cache.lookupRecords(name, type, dclass, cred);
/*System.out.println(cached);*/
if (cached.isSuccessful()) {
RRset rrset = cached.answer();
answerCount = rrset.size();
e = rrset.rrs();
} else if (cached.isNegative()) {
answerCount = 0;
e = null;
} else {
question = Record.newRecord(name, type, dclass);
query = Message.newQuery(question);
if (res != null) response = res.send(query);
else response = eres.send(query);
short rcode = response.getHeader().getRcode();
if (rcode == Rcode.NOERROR || rcode == Rcode.NXDOMAIN) cache.addMessage(response);
if (rcode != Rcode.NOERROR) return null;
e = response.getSection(Section.ANSWER);
while (e.hasMoreElements()) {
Record r = (Record) e.nextElement();
if (matchType(r.getType(), type)) answerCount++;
}
e = response.getSection(Section.ANSWER);
}
if (answerCount == 0) return null;
answers = new Record[answerCount];
while (e.hasMoreElements()) {
Record r = (Record) e.nextElement();
if (matchType(r.getType(), type)) answers[i++] = r;
}
return answers;
}