/**
* Find the best editlog input stream to read from txid. If a journal throws an
* CorruptionException while reading from a txn id, it means that it has more transactions, but
* can't find any from fromTxId. If this is the case and no other journal has transactions, we
* should throw an exception as it means more transactions exist, we just can't load them.
*
* @param fromTxnId Transaction id to start from.
* @return A edit log input stream with tranactions fromTxId or null if no more exist
*/
@Override
public EditLogInputStream getInputStream(long fromTxnId) throws IOException {
JournalManager bestjm = null;
long bestjmNumTxns = 0;
CorruptionException corruption = null;
for (JournalAndStream jas : journals) {
JournalManager candidate = jas.getManager();
long candidateNumTxns = 0;
try {
candidateNumTxns = candidate.getNumberOfTransactions(fromTxnId);
} catch (CorruptionException ce) {
corruption = ce;
} catch (IOException ioe) {
continue; // error reading disk, just skip
}
if (candidateNumTxns > bestjmNumTxns) {
bestjm = candidate;
bestjmNumTxns = candidateNumTxns;
}
}
if (bestjm == null) {
if (corruption != null) {
throw new IOException("No non-corrupt logs for txid " + fromTxnId, corruption);
} else {
return null;
}
}
return bestjm.getInputStream(fromTxnId);
}
public void startLogSegment(long txId) throws IOException {
Preconditions.checkState(stream == null);
disabled = false;
stream = journal.startLogSegment(txId);
}
public JournalIdGenerator(JournalManager journal, int maxItem) {
System.out.println("MAX STORE IN ID GENERATOR = " + maxItem);
lastId = journal.getMaxIdSaved();
counter = journal.getCounter();
MAX_STORED_INDEX = maxItem;
}
