protected synchronized void asyncReadEntries(OpReadEntry opReadEntry) {
if (state == State.Fenced) {
opReadEntry.failed(new ManagedLedgerFencedException());
return;
}
LedgerHandle ledger = null;
if (opReadEntry.readPosition.getLedgerId() == -1) {
if (ledgers.isEmpty()) {
// The ManagedLedger is completely empty
opReadEntry.emptyResponse();
return;
}
// Initialize the position on the first entry for the first ledger
// in the set
opReadEntry.readPosition = new Position(ledgers.firstKey(), 0);
}
long id = opReadEntry.readPosition.getLedgerId();
if (id == currentLedger.getId()) {
// Current writing ledger is not in the cache (since we don't want
// it to be automatically evicted), and we cannot use 2 different
// ledger handles (read & write)for the same ledger.
ledger = currentLedger;
} else {
ledger = ledgerCache.getIfPresent(id);
if (ledger == null) {
// Open the ledger and cache the handle
log.debug("[{}] Asynchronously opening ledger {} for read", name, id);
bookKeeper.asyncOpenLedger(
id, config.getDigestType(), config.getPassword(), this, opReadEntry);
return;
}
}
internalReadFromLedger(ledger, opReadEntry);
}
