/// <summary>
/// Find out how many transactions we can read from a
/// FileJournalManager, starting at a given transaction ID.
/// </summary>
/// <param name="jm">The journal manager</param>
/// <param name="fromTxId">Transaction ID to start at</param>
/// <param name="inProgressOk">Should we consider edit logs that are not finalized?</param>
/// <returns>The number of transactions</returns>
/// <exception cref="System.IO.IOException"/>
internal static long GetNumberOfTransactions(FileJournalManager jm, long fromTxId
, bool inProgressOk, bool abortOnGap)
{
long numTransactions = 0;
long txId = fromTxId;
PriorityQueue <EditLogInputStream> allStreams = new PriorityQueue <EditLogInputStream
>(64, JournalSet.EditLogInputStreamComparator);
jm.SelectInputStreams(allStreams, fromTxId, inProgressOk);
EditLogInputStream elis = null;
try
{
while ((elis = allStreams.Poll()) != null)
{
try
{
elis.SkipUntil(txId);
while (true)
{
FSEditLogOp op = elis.ReadOp();
if (op == null)
{
break;
}
if (abortOnGap && (op.GetTransactionId() != txId))
{
Log.Info("getNumberOfTransactions: detected gap at txId " + fromTxId);
return(numTransactions);
}
txId = op.GetTransactionId() + 1;
numTransactions++;
}
}
finally
{
IOUtils.Cleanup(Log, elis);
}
}
}
finally
{
IOUtils.Cleanup(Log, Sharpen.Collections.ToArray(allStreams, new EditLogInputStream
[0]));
}
return(numTransactions);
}
/// <exception cref="System.IO.IOException"/>
private static EditLogInputStream GetJournalInputStream(JournalManager jm, long txId
, bool inProgressOk)
{
PriorityQueue <EditLogInputStream> allStreams = new PriorityQueue <EditLogInputStream
>(64, JournalSet.EditLogInputStreamComparator);
jm.SelectInputStreams(allStreams, txId, inProgressOk);
EditLogInputStream elis = null;
EditLogInputStream ret;
try
{
while ((elis = allStreams.Poll()) != null)
{
if (elis.GetFirstTxId() > txId)
{
break;
}
if (elis.GetLastTxId() < txId)
{
elis.Close();
continue;
}
elis.SkipUntil(txId);
ret = elis;
elis = null;
return(ret);
}
}
finally
{
IOUtils.Cleanup(Log, Sharpen.Collections.ToArray(allStreams, new EditLogInputStream
[0]));
IOUtils.Cleanup(Log, elis);
}
return(null);
}