public Iterator<Integer> askServerForMore() {
mCurrConf = mUnreadConfs.element();
Log.i(
TAG,
"PrefetchNextUnread askServerForMore mCurrConf: "
+ mCurrConf
+ " mCurrConfLocalNo: "
+ mCurrConfLastRead);
final Membership membership;
final TextMapping tm;
final List<Integer> maybeUnread = new ArrayList<Integer>();
try {
membership = mKom.getSession().queryReadTexts(mKom.getUserId(), mCurrConf, true);
mCurrConfLastRead = lastTextReadFrom(membership, mCurrConfLastRead);
Log.i(TAG, "PrefetchNextUnread mCurrConfLastRead: " + mCurrConfLastRead);
final UConference conf = mKom.getSession().getUConfStat(mCurrConf);
if (mCurrConfLastRead < conf.getHighestLocalNo()) {
tm = mKom.getSession().localToGlobal(mCurrConf, mCurrConfLastRead + 1, ASK_AMOUNT);
Log.i(
TAG,
"PrefetchNextUnread asked for "
+ ASK_AMOUNT
+ " texts in conf "
+ mCurrConf
+ ", got "
+ tm.size());
} else {
Log.i(TAG, "PrefetchNextUnread too high local number in " + mCurrConf);
tm = null;
}
} catch (final IOException e) {
Log.i(TAG, "PrefetchNextUnread IOException");
return Collections.<Integer>emptyList().iterator();
}
while (tm != null && tm.hasMoreElements()) {
final int globalNo = (Integer) tm.nextElement();
final int localNo = tm.local();
if (!membership.isRead(localNo)) {
Log.i(
TAG, "PrefetchNextUnread adding localNo " + localNo + " (globalNo " + globalNo + ")");
maybeUnread.add(globalNo);
}
mCurrConfLastRead = Math.max(mCurrConfLastRead, localNo);
}
if (tm == null || !tm.laterTextsExists()) {
Log.i(TAG, "PrefetchNextUnread no later texts exists in conf " + mCurrConf);
mUnreadConfs.remove();
mCurrConfLastRead = -1;
}
return maybeUnread.iterator();
}
private int lastTextReadFrom(final Membership membership, final int from) {
final List<Range> readRanges = membership.getReadRanges();
if (from < 0) {
return membership.getLastTextRead();
}
synchronized (readRanges) {
for (final Range range : readRanges) {
if (from < range.first) {
return from;
} else if (from <= range.last) {
return range.last;
}
}
return readRanges.get(readRanges.size() - 1).last;
}
}