private void internalReadFromLedger(LedgerHandle ledger, OpReadEntry opReadEntry) {
// Perform the read
long firstEntry = opReadEntry.readPosition.getEntryId();
if (firstEntry > ledger.getLastAddConfirmed()) {
log.debug(
"[{}] No more messages to read from ledger={} lastEntry={} readEntry={}",
va(name, ledger.getId(), ledger.getLastAddConfirmed(), firstEntry));
if (ledger.getId() != currentLedger.getId()) {
// Cursor was placed past the end of one ledger, move it to the
// beginning of the next ledger
Long nextLedgerId = ledgers.ceilingKey(ledger.getId() + 1);
opReadEntry.nextReadPosition = new Position(nextLedgerId, 0);
}
opReadEntry.emptyResponse();
return;
}
long lastEntry = min(firstEntry + opReadEntry.count - 1, ledger.getLastAddConfirmed());
long expectedEntries = lastEntry - firstEntry + 1;
opReadEntry.entries = Lists.newArrayListWithExpectedSize((int) expectedEntries);
log.debug(
"[{}] Reading entries from ledger {} - first={} last={}",
va(name, ledger.getId(), firstEntry, lastEntry));
ledger.asyncReadEntries(firstEntry, lastEntry, this, opReadEntry);
}
/*
* (non-Javadoc)
*
* @see
* org.apache.bookkeeper.client.AsyncCallback.ReadCallback#readComplete(int,
* org.apache.bookkeeper.client.LedgerHandle, java.util.Enumeration,
* java.lang.Object)
*/
@Override
public void readComplete(
int rc, LedgerHandle lh, Enumeration<LedgerEntry> entriesEnum, Object ctx) {
OpReadEntry opReadEntry = (OpReadEntry) ctx;
if (rc != BKException.Code.OK) {
log.warn(
"[{}] read failed from ledger {} at position:{}",
va(name, lh.getId(), opReadEntry.readPosition));
opReadEntry.failed(new ManagedLedgerException(BKException.create(rc)));
return;
}
List<Entry> entries = opReadEntry.entries;
while (entriesEnum.hasMoreElements()) entries.add(new EntryImpl(entriesEnum.nextElement()));
long lastEntry = entries.get(entries.size() - 1).getPosition().getEntryId();
// Get the "next read position", we need to advance the position taking
// care of ledgers boundaries
Position nextReadPosition;
if (lastEntry < lh.getLastAddConfirmed()) {
nextReadPosition = new Position(lh.getId(), lastEntry + 1);
} else {
// Move to next ledger
Long nextLedgerId = ledgers.ceilingKey(lh.getId() + 1);
if (nextLedgerId == null) {
// We are already in the last ledger
nextReadPosition = new Position(lh.getId(), lastEntry + 1);
} else {
nextReadPosition = new Position(nextLedgerId, 0);
}
}
opReadEntry.nextReadPosition = nextReadPosition;
opReadEntry.succeeded();
}
